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| 1 | Wearable strain sensing textile based on one-dimensional stretchable and weavable yarn sensors显示文摘Flexible, wearable, and even stretchable sensors are the key components ofsmart electronic textiles. However, most reported flexible and wearable sensorsfor wearable electronics are usually fabricated in two-dimensional (2D) planarstrip configurations, which cannot be properly integrated into textile structuresand thus greatly degrade intrinsic properties such as the softness, flexibility, andair permeability of textiles and the aesthetic feeling of clothing. In this work, a newone-dimensional weavable strain sensing yarn consisting of an elastic polyurethane(PU) core, a conductive Ag-nanopartides/graphene-microsheets composite sheath,and a silicone encapsulation layer was designed and fabricated through aneasily manipulated protocol. Arising from the reasonable structural design andappropriate material selection, the as-fabricated strain sensor not only exhibitedexcellent flexibility, stretchability, and highly repeatable electromechanicalstability (a repeatability error of 1.56%) but also possessed both high sensitivity(a gauge factor of nearly 500) and a relatively wide working range (0-50%applied strain) with good linearity (a correlation coefficient of 0.98). In addition,the facile, nearly all-solution-based fabrication protocol enabled the scalableproduction of long conductive yams. Thus, the proper yarn length and superbmechanical properties endowed the stretchable conductive yarn with goodweavability. The excellent wearability of the stretchable conductive yarn wasderived from the outermost isolating, hydrophobic, and biocompatible siliconeencapsulation layer. A wearable high-sensitivity strain sensing textile, fabricatedby directly weaving the as-prepared yarn-based sensor, showed great potentialfor application to wearable textile sensors for real-time monitoring of humanmotions from vigorous walkin~ to subtle and complex pronunciations. | Xiaoting Li Haibo Hu Tao Hua Bingang Xu Shouxiang Jiang | 2018 | Nano Research2018，11，11： | 13 |
| 2 | 基于二硫键的聚氨酯网络:从可调多重形状记忆性能到同步修复(英文)显示文摘随着智能化时代的迅速发展,具有多功能或多响应的智能材料受到高度关注.但如何将多个智能单元以协同模式结合到单一系统中仍是研究者面临的巨大挑战.本文设计合成了一种新型聚氨酯动态交联网络,该材料能够以独立的方式和协同作用模式呈现形状记忆效应和自修复效应.为了实现这一目标,本文选择了聚四氢呋喃作为软链段以确保聚合物链具有良好的运动性,同时将动态共价键二硫键引入聚氨酯的主链中以实现材料在温和条件下的自修复.此外,通过有效调节二硫键含量、交联度和网络结构,获得了较宽的玻璃化转变温度(T_g),使网络具有两重、三重甚至四重形状的记忆效应.在此基础上,利用该材料的形状回复和修复的外界刺激条件的高度吻合,同时实现了材料修复和回复,拓宽了材料的应用范围. | 邓小莹 谢辉 杜澜 范诚杰 成川颖 杨科珂 王玉忠 | 2019 | Science China Materials2019，62，3： | 11 |
| 3 | Friction and wear behaviors of MoS2-multi-walled-carbonnanotube hybrid reinforced polyurethane composite coating显示文摘MoS2-multi-walled-carbon-nanotube(MWCNT)hybrids containing two-dimensional MoS2 and one-dimensional MWCNTs were synthesized through a one-step hydrothermal reaction.X-ray-diffraction and transmission-electron-microscopy results demonstrated that MoS2 nanosheets were successfully synthesized,and uniformly anchored on the MWCNTs’surfaces.Furthermore,the effects of the Mo S2-MWCNT hybrids on the tribological performances of polyurethane composite coatings were investigated using a UMT-2MT tribo-tester.Friction and wear test results revealed that the friction coefficient and wear rate of a 3 wt%Mo S2-MWCNT-1 filled polyurethane composite coating were reduced by 25.6% and 65.5%,respectively.The outstanding tribological performance of the MoS2-MWCNT-1 reinforced polyurethane composite coating was attributed to the excellent load-carrying capacity of the MWCNTs and good lubricant ability of MoS2.The surface morphologies of the worn surfaces and counterpart ball surfaces were investigated to reveal the wear mechanisms. | Zhaozhu ZHANG Mingming YANG Junya YUAN Fang GUO Xuehu MEN | 2019 | Friction2019，7，4： | 7 |
| 4 | Skeletal muscle-derived cells repair peripheral nerve defects in mice显示文摘Skeletal muscle-derived cells have strong secretory function,while skeletal muscle-derived stem cells,which are included in muscle-derived cells,can differentiate into Schwann cell-like cells and other cell types.However,the effect of muscle-derived cells on peripheral nerve defects has not been reported.In this study,5-mm-long nerve defects were created in the right sciatic nerves of mice to construct a peripheral nerve defect model.Adult female C57BL/6 mice were randomly divided into four groups.For the muscle-derived cell group,muscle-derived cells were injected into the catheter after the cut nerve ends were bridged with a polyurethane catheter.For external oblique muscle-fabricated nerve conduit and polyurethane groups,an external oblique muscle-fabricated nerve conduit or polyurethane catheter was used to bridge the cut nerve ends,respectively.For the sham group,the sciatic nerves on the right side were separated but not excised.At 8 and 12 weeks post-surgery,distributions of axons and myelin sheaths were observed,and the nerve diameter was calculated using immunofluorescence staining.The number,diameter,and thickness of myelinated nerve fibers were detected by toluidine blue staining and transmission electron microscopy.Muscle fiber area ratios were calculated by Masson’s trichrome staining of gastrocnemius muscle sections.Sciatic functional index was recorded using walking footprint analysis at 4,8,and 12 weeks after operation.The results showed that,at 8 and 12 weeks after surgery,myelin sheaths and axons of regenerating nerves were evenly distributed in the muscle-derived cell group.The number,diameter,and myelin sheath thickness of myelinated nerve fibers,as well as gastrocnemius muscle wet weight and muscle area ratio,were significantly higher in the muscle-derived cell group compared with the polyurethane group.At 4,8,and 12 weeks post-surgery,sciatic functional index was notably increased in the muscle-derived cell group compared with the polyurethane group.These criteria of the muscle-derived cell group were not significantly different from the external oblique muscle-fabricated nerve conduit group.Collectively,these data suggest that muscle-derived cells effectively accelerated peripheral nerve regeneration.This study was approved by the Animal Ethics Committee of Plastic Surgery Hospital,Chinese Academy of Medical Sciences(approval No.040)on September 28,2016. | Zi-Xiang Chen Hai-Bin Lu Xiao-Lei Jin Wei-Feng Feng Xiao-Nan Yang Zuo-Liang Qi | 2020 | Neural Regeneration Research2020，15，1： | 7 |
| 5 | 聚氨酯弹性体耐酸碱性能的影响因素显示文摘讨论了软硬段结构和配合剂对聚氨酯弹性体耐酸碱腐蚀性能的影响,认为软段采用多官能度的聚烯烃结构,并引入卤素原子作侧链时,聚氨酯弹性体具有最佳的耐酸碱性能;硬段宜采用对称的芳香族异氰酸酯,以增加链段的刚性和结晶,并适量采用多官能度小分子醇类扩链剂,提高交联密度;在强酸强碱介质中,不宜使用配合剂。同时,综述了聚氨酯弹性体耐酸碱性能的研究进展。 | 易玉华 陈万滨 | 2010 | 弹性体2010，20，6： | 7 |
| 6 | Syntheses and characterization of anti-thrombotic and anti-oxidative Gastrodin-modified polyurethane for vascular tissue engineering显示文摘Vascular grafts must avoid negative inflammatory responses and thrombogenesis to prohibit fibrotic deposition immediately upon implantation and promote the regeneration of small diameter blood vessels(<6 mm inner diameter).Here,polyurethane(PU)elastomers incorporating anti-coagulative and anti-inflammatory Gastrodin were fabricated.The films had inter-connected pores with porosities equal to or greater than 86%and pore sizes ranging from 250 to 400μm.Incorporation of Gastrodin into PU films resulted in desirable mechanical properties,hydrophilicity,swelling ratios and degradation rates without collapse.The released Gastrodin maintained bioactivity over 21 days as assessed by its anti-oxidative capability.The Gastrodin/PU had better anti-coagulation response(less observable BSA,fibrinogen and platelet adhesion/activation and suppressed clotting in whole blood).Red blood cell compatibility,measured by hemolysis,was greatly improved with 2Gastrodin/PU compared to other Gastrodin/PU groups.Notably,Gastrodin/PU upregulated anti-oxidant factors Nrf2 and HO-1 expression in H2O2 treated HUVECs,correlated with decreasing pro-inflammatory cytokines TNF-αand IL-1β in RAW 264.7 cells.Upon implantation in a subcutaneous pocket,PU was encapsulated by an obvious fibrous capsule,concurrent with a large amount of inflammatory cell infiltration,while Gastrodin/PU induced a thinner fibrous capsule,especially 2Gastrodin/PU.Further,enhanced adhesion and proliferation of HUVECs seeded onto films in vitro demonstrated that 2Gastrodin/PU could help cell recruitment,as evidenced by rapid host cell infiltration and substantial blood vessel formation in vivo.These results indicate that 2Gastrodin/PU has the potential to facilitate blood vessel regeneration,thus providing new insight into the development of clinically effective vascular grafts. | Meng Zheng Jiazhi Guo Qing Li Jian Yang Yi Han Hongcai Yang Mali Yu Lianmei Zhong Di Lu Limei Li Lin Sun | 2021 | Bioactive Materials2021，6，2： | 7 |
| 7 | Magnetically Driven Superhydrophobic Polyurethane Sponge for High Efficiency Oil/Water Mixtures Separation显示文摘Magnetically driven super-hydrophobic materials were prepared by Fe3O4 nanoparticles and stearic acid,which were deposited on the surface of polyurethane sponges.The presence of the Fe3O4 nanoparticles makes the sponge have the magnetic,and the micro-nano hierarchical structure and hydrophobic functional groups lead to the sponge have excellent superhydrophobicity.The as-prepared sponge exhibited excellent absorption capacities for various oils and organic solvents ranging from 23.8 times to 86.7 times of its own weight.Moreover,the oil separation capacities still keep a high value after 50 cycles of squeezing the saturated absorbed as-prepared sponge.All of these satisfactory properties make the as-prepared sponge as a candidate of ideal absorbents for oily industrial wastewater and oil spills in oceans. | Xuemei Zhang Feng Fu Xiaoming Gao Xiufang Hou | 2019 | Journal of Bionic Engineering2019，16，1： | 6 |
| 8 | Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent显示文摘Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine (Instron3365), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that polyurea and polybiuret were the typical charac- teristics, and the cream time and gel time were shorter for the fully water blown rigid foams than that for the fully cyclopentane blown foams. The density of foam samples decreased from 45.0 kg/m3 to 27.4 kg/m3 with the increase of water level from 3 pph to 7 pph. Compressive strength exhibited the similar behavior with density. The average cell size of foam samples ranged from 241 μm to 356 μm with the increase of water level from 3 pph to 7 pph, respectively. At the same time, poorer dimen- sional stability was encountered with the increase of average cell size due to fast diffusion rate of CO2 out of the foam. The results of thermal analysis show that the glass transition temperature (Tg) shifted to a higher temperature with the increase of isocyanate level when more water was used as chemical blowing agent. | LI Xiaobin1,2, CAO Hongbin1 & ZHANG Yi1 1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China | 2006 | Science China Chemistry2006，49，4： | 6 |
| 9 | Development of polyurethane foam dressing containing silver and asiaticoside for healing of dermal wound显示文摘Polyurethane foam dressings for dermal wounds were formulated with natural polyols in order to improve the foam characteristics and the release of 2 active agents,silver and asiaticoside(AS)as an antimicrobial agent and an herbal wound healing agent,respectively.The foam was instantly formed by interaction of polyols and diisocyanate.Hydroxypropyl methylcellulose,chitosan and sodium alginate were individually mixed with themain polyols,polypropylene glycol,in the formulation while the active componentswere impregnated into the obtained foam dressing sheets.Although the type and amount of the natural polyols slightly affected the pore size,water sorption-desorption profile and compression strength of the obtained foam sheets,a prominent effect was found in the release of both active components.Among natural polyols formulations,foam sheets with alginate showed the highest silver and AS release.Non-cytotoxicity of these foam sheets to human fibroblast cells was confirmed.Antimicrobial testing on four bacteria strains showed that 1mg/cm^2 silver in formulations with 6%of natural polyols and without natural polyols had sufficient content of the silver release with comparable inhibition zone and significantly larger zone than other formulations.In pig study,the foam dressing with 6%alginate,1mg/cm^2 silver and 5%AS could improve wound healing in both the percentage of the wound closure and histological parameters of the dermal wound without any dermatologic reactions.In conclusion,this innovative foam dressing had potential to be a good candidate for wound treatment. | Nantaporn Namviriyachote Vimolmas Lipipun Yada Akkhawattanangkul Phingphol Charoonrut Garnpimol C.Ritthidej | 2019 | Asian Journal of Pharmaceutical Sciences2019，14，1： | 6 |
| 10 | Preparation of lignin/TiO2 nanocomposites and their application in aqueous polyurethane coatings显示文摘A simple method using a water soluble lignin quaternary ammonium salt (LQAS) and TiO2 has been developed for the preparation of lignin/TiO2 nanocomposites in an aqueous medium under mild conditions. The LQAS/TiO2 nanocomposites contain well-dispersed small particles with excellent ultraviolet (UV) shielding abilities and good compatibilities with waterborne polyurethane (WPU). When the LQAS/TiO2 nanocomposites were blended with WPU, the UV absorbance and the tensile ductility of the WPU increased significantly. The composite WPU hybrid film containing 6 wt-% LQAS/TiO2 nanocomposite had the highest visible light transmittance and had excellent ultraviolet aging properties. After 192 h of UV light irradiation, the tensile strength of the composite film was above 8 MPa and the elongation at break was 800%. This work highlights new possibilities for the utilization of alkali lignin. | Dongjie Yang Shengyu Wang Ruisheng Zhong Weifeng Liu Xueqing Qiu | 2019 | Frontiers of Chemical Science and Engineering2019，13，1： | 5 |
| 11 | Determination of effective thermal conductivity for polyurethane foam by use of fractal method显示文摘The microstructure of polyurethane foam is disordered, which influences the foam heat conduction process significantly. In this paper foam structure is described by using the local area fractal dimension in a certain small range of length scales. An equivalent element cell is constructed based on the local fractal dimensions along the directions parallel and transverse to the heat flux. By use of fractal void fraction a simpli- fied heat conduction model is proposed to calculate the effective thermal conductivity of polyurethane foam. The predicted effective thermal conductivity agrees well with the ex- perimental data. | SHI Mingheng LI Xiaochuan CHEN Yongping | 2006 | Science China(Technological Sciences)2006，49，4： | 5 |
| 12 | The production of biobased diamines from renewable carbon sources: Current advances and perspectives显示文摘Bio-based diamines are considered to be a promising alternative to traditional fossil-fuel-based diamines,the important platform chemical for the synthesis of polymer materials.In this review,the current status of the art of the synthesis of aliphatic and aromatic diamines from renewable biomass are considered.In the case of aliphatic diamines,we describe strategies for biologically producing diamines with different carbon numbers including 1,3-diaminopropane,1,4-butanediamine,1,5-pentanediamine,1,6-diaminohexane,1,8-diaminooctane,1,10-diaminodecane,and 1,12-diaminododecane.In addition,aromatic diamines produced from various kinds of renewable biomass,including lignin,cashew nut shell,and terpenoids,are reviewed here.Furthermore,the application of typical diamines in synthesis of polyurethane and polyamide are also reviewed. | Xin Wang Siyuan Gao Jing Wang Sheng Xu Hui Li Kequan Chen Pingkai Ouyang | 2021 | Chinese Journal of Chemical Engineering2021，34，2： | 5 |
| 13 | Materials,preparation,performances and mechanism of polyurethane modified asphalt and its mixture:A systematic review显示文摘With the rapid development of asphalt pavement technology,it has attracted considerable attention to improving the durability of asphalt pavement.An effective action is to use modified asphalt with high performance and durability.Polyurethane(PU)has been used in asphalt pavement engineering to enhance the durability and service life of asphalt pavement because of its excellent high-temperature performance,toughness,wear resistance,aging resistance and oil resistance.However,PU modified asphalt technology is still in the exploratory stage.The preparation,modification mechanism and working performances of PU modified asphalt need to be further clarified.Therefore,this paper summarized the research progress of PU modified asphalt and its mixture.The composition of PU modified asphalt was introduced.The addition methods of PU materials and preparation process parameters of the PU modified asphalt were determined.The modification mechanism of PU on asphalt was discussed.The effects of polyurethane on asphalt were analyzed and the road performances of its mixture were evaluated.Finally,the development tendency towards PU modified asphalt and its mixture were forecasted. | Chaohui Wang Shuai Huang Qian Chen Xiaoping Ji Kaixi Duan | 2023 | Journal of Road Engineering2023，3，1： | 4 |
| 14 | Evaluation on Self-healing Mechanism and Hydrophobic Performance of Asphalt Modified by Siloxane and Polyurethane显示文摘In order to inhibit and remove the thin ice and extend the lifetime of the damaged bridge, the self-healing mechanism and hydrophobic performance of asphalt modified by siloxane and polyurethane (ASP) were studied by dynamic shear rheology (DSR), fluorescence microscope (FM), atomic force microscope (AFM), the fracture-healing-re-fracture test and molecular simulations. The experimental results indicated that the selfhealing capability of ASP increased with increasing heating time and temperature. Furthermore, the addition of siloxane could improve the reaction energy barrier and complex modulus, and it is believed that the self-healing is a viscosity driven process, consisting of two parts namely crack closure and properties recovery. Contact angle of ASP increased with the increasing siloxane content and it deduced that the siloxane could improve the hydrophobic performance of ASP and the ASP molecule model could simulate well the self-healing mechanism and hydrophobic performance of ASP. | 周新星 SUN Bin WU Shaopeng ZHANG Xiao LIU Quantao 肖月 | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，3： | 4 |
| 15 | Synthesis of waterborne polyurethane using snow as dispersant:Structures and properties controlled by polyols utilization显示文摘waterborne polyurethane (WPU) dispersions have gained attention towards environm entally-friendly synthesis. In this article, a series of waterborne polyurethane em ulsions was successfully synthesized and extensively characterized in terms of thermal, mechanical properties, hydrophilic behavior and morphology. Snowwas chosen as dispersant instead of comm only used water. Preparation param eters such as intrinsic properties and molecular weight of polyols were discussed systematically. A chain structure was confirmed by Fourier transform infrared (FT-IR) spectroscopy. when com paring the nature of the polyols (PPG, PEG and PNA, 2000g/mol) of this study, as-synthesized polyether waterborne polyurethane provided higher solid content, viscosity and water-resistance. However, polyester waterborne polyurethane perform ed differently and it exhibited higher therm al stability and crystallinity. When com paring the samples (WPU-N210, WPU-N220, WPU-N230 and WPU-N240) with different molecular weight of the same polyol (PPG) used as soft segment, the emulsion WPU-N220 with molecular weight of 2000g/mol PPG provided the highest solid content and lowest viscosity. It was observed th at particle size was uniform and highly dispersed for all sam ples from TEM images. Therm ogravim etric, differential scanning calorim etry (DSC) and X-ray diffraction results dem onstrated that the emulsion WPU-N230 with m olecular weight of 3000 g/mol PPG possessed higher therm al stability and crystallinity than the other samples. The reason was that the Tg and thermal stability were increased with increasing molecular weight. when molecular weight increased, the arrangem ent of soft segm ent became more regular and so did the regularity of the molecular chains. This work demonstrated that different polyols as soft segment applied could lead to great differences in the structure and property of the resulting WPU. | Changqing Fang Shaofei Pan Zhen Wang Xing Zhou Wanqing Lei Youliang Cheng | 2019 | Journal of Materials Science & Technology2019，35，7： | 4 |
| 16 | Polyurethane-SAPO-34 mixed matrix membrane for CO_2/CH_4 and CO_2/N_2 separation显示文摘SAPO-34 nanocrystals(inorganic filler) were incorporated in polyurethane membranes and the permeation properties of CO_2, CH_4,and N_2 gases were explored. In this regard, the synthesized PU-SAPO-34 mixed matrix membranes(MMMs) were characterized via SEM, AFM, TGA, XRD and FTIR analyses. Gas permeation properties of PU-SAPO-34 MMMs with SAPO-34 contents of 5 wt%, 10 wt% and 20 wt% were investigated. The permeation results revealed that the presence of 20 wt% SAPO-34 resulted in 4.45%, 18.24% and 40.2% reductions in permeability of CO_2,CH_4,and N_2, respectively, as compared to the permeability of neat polyurethane membrane. Also,the findings showed that at the pressure of 1.2 MPa, the incorporation of 20 wt% SAPO-34 into the polyurethane membranes enhanced the selectivity of CO_2/CH_4 and CO_2/N_2, 14.43 and 37.46%, respectively. In this research, PU containing 20 wt% SAPO-34 showed the best separation performance. For the first time, polynomial regression(PR) as a simple yet accurate tool yielded a mathematical equation for the prediction of permeabilities with high accuracy(R^2>99%). | Gholamhossein Sodeifian Mojtaba Raji Morteza Asghari Mashallah Rezakazemi Amir Dashti | 2019 | Chinese Journal of Chemical Engineering2019，27，2： | 3 |
| 17 | Evaluation of fatigue and rutting properties of asphalt binderand mastic modified by synthesized polyurethane显示文摘Fatigue and rutting phenomena are major distresses in asphalt pavements.Asphalt mixture properties are highly dependent upon the asphalt binder and the mastic behavior.The purpose of this study was to investigate the behavior of the asphalt binder and the mastic,modified by the synthesized polyurethane,at high and intermediate temperatures.The filler/asphalt binder ratio(by weight)was 1.0.The dynamic shear rheometer(DSR)was used to measure fatigue(G^(*)sinδ)and rutting(G^(*)/sinδ)parameters.In this study,the multiple stress creepandrecovery(MSCR)testwasalso utilizedto calculate the ruttingpotential of theasphalt binder and themastic.Parameters of the non-recoverable compliance(Jnr)and the percentage recovery(%)were evaluated at high temperatures.The obtained results indicated that the synthesizedpolyurethaneimproved the ruttingandfatigue properties.Therewasa significant correlation between the asphalt binder and the mastic in terms of the complex modulus(R^(2)=0.9958),rutting(R^(2)=0.9944),and the non-recoverable compliance(R^(2)=0.9707).For the fatigue parameter(R^(2)=0.9852),the complex modulus(R^(2)=0.9855),and the phase angle(R^(2)=0.8262),significant relationships were observed between the asphalt binder and mastic samples at intermediate temperatures.Overall,the chemical reaction between the filler and the asphalt binder could be effective in different behaviors of the mastic and asphalt binder.Therewasa 112%-164%increase in the G^(*)sinδparameter formastics,compared to that of the asphalt binder.The complex modulus was 6 times higher by adding the filler content. | Mana Motamedi Gholamali Shafabakhsh Mohammad Azadi | 2021 | Journal of Traffic and Transportation Engineering(English Edition)2021，8，6： | 3 |
| 18 | The influence of the NCO/OH ratio and the 1,6-hexanediol/ dimethylol propionic acid molar ratio on the properties of waterborne polyurethane dispersions based on 1,5-pentamethylene diisocyanate显示文摘1,5-Pentamethylene diisocyanate, a novel aliphatic diisocyanate formed from bio-based 1,5-pentamethylenediamine, has been used as a hard segmented material to synthesize polyurethane. In this study, several waterborne polyurethane (WPU) dispersions have been successfully prepared by a prepolymer process from 1,5-pentamethylene diisocyanate poly(polyether) with different NCO/OH ratios and 1,6-hexanediol (HDO)/dimethylol propionic acid (DMPA) molar ratios. The Fourier transfonn infrared (FTIR) spectra, thermogravimetric analysis, differential scanning calorimetry, X-ray diffiraction, and a mechanical tensile test were used to investigate the structures, thermal stability, phase separation, crystallinity, mechanical properties, and adhesive performance of the WPU dispersions. The FTIR results indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratio and HDO/DMPA molar ratio increase. Furthermore, the phase separation increases and the thermal stability decreases as the NCO/OH ratio increases or the HDO/DMPA molar ratio decreases. Finally, WPU3.0-2.4 (NCO/OH = 3, HDO/DMPA = 2.4) exhibits a maximum tensile strength and shear strength, pointing to its possible use as an adhesive. These results could provide a very valuable reference for industrial applications of WPU. | Jiao Feng Qiuhao Lu Weimin Tan Kequan Chen Pingkai Ouyang | 2019 | Frontiers of Chemical Science and Engineering2019，13，1： | 3 |
| 19 | Physical and damping properties of kenaf fibre filled natural rubber/thermoplastic polyurethane composites显示文摘The paper presents the investigation of the effect of alkaline treatment of sodium hydroxide(NaOH) on physical and dynamic mechanical analysis(DMA) viscoelastic properties of kenaf fibre filled natural rubber(NR)/thermoplastic polyurethane(TPU) composites.The treated kenaf fiber,NR and TPU were weighed and proportioned according to the required compositions and were blended using hot mixed Brabender machine.The polymer composites were then fabricated using the hot press to form a sample board.The sample was cut and prepared and water absorption,density,thickness swelling and DMA tests were performed.As far as physical properties are concerned,composites with the highest NR amount of shows the best results,which indicates good fiber bonding adhesion.The polymer composites with the highest amount of TPU shows the highest damping properties at high temperature. | A.M.Noor Azammi S.M.Sapuan Mohamad R.Ishak Mohamed T.H.Sultan | 2020 | Defence Technology(防务技术)2020，16，1： | 3 |
| 20 | A Robust Self-healing Polyurethane Elastomer Enabled by Tuning the Molecular Mobility and Phase Morphology through Disulfide Bonds显示文摘Elastomers with outstanding strength,toughness and healing efficiency are highly promising for many emerging fields.However,it is still a challenge to integrate all these beneficial features in one elastomer.Herein,an asymmetric alicyclic structure adjacent to aromatic disulfide was tactfully introduced into the backbone of polyurethane(PU)elastomer.Specifically,such elastomer(PU-HPS)was fabricated by polycondensing polytetramethylene ether glycol(PTMEG),isophorone diisocyanate(IPDI)and p-hydroxydiphenyl disulfide(HPS)via one-pot method.The molecular mobility and phase morphology of PU-HPS can be tuned by adjusting the HPS content.Consequently,the dynamic exchange of hydrogen and disulfide bonds in the hard segment domains can also be tailored.The optimized sample manifests outstanding tensile strength(46.4 MPa),high toughness(109.1 MJ/m^(3)),high self-healing efficiency after fracture(90.3%),complete scratch recovery(100%)and good puncture resistance.Therefore,this work provides a facile strategy for developing robust self-healing polymers. | Hai-Tao Wu Bi-Qiang Jin Hao Wang Wen-Qiang Wu Zhen-Xing Cao Zhao-Yang Yuan Yue Huang Wei-Hang Li Guang-Su Huang Lu-Sheng Liao Jin-Rong Wu | 2021 | Chinese Journal of Polymer Science2021，39，10： | 3 |
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