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Enhancement of the mechanical properties of polylactic acid/basalt fiber composites via in-situ assembling silica nanospheres on the interface

查看全文 作　　者：Xianliang [1]Hou;Shun [2]Yao;Zhen [1,2]Wang;Changqing [2]Fang;Tiehu [1]Li 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an,710072,China;[2]Faculty of Printing,Packaging and Digital Media Technology,Xi’an University of Technology,Xi'an,710048,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第25期,共9页高影响力期刊 基　　金：funded by China Postdoctoral Science Foundation(No.2018M643699);the Xi’an Science and Technology Bureau Innovation Leading Projects(No.201805037YD15CG21(23));the Natural Science Foundation of Shaanxi Province(No.2019JQ741);the Science and Technology Bureau of Beilin District,Xi’an(No.GX2035);the Postdoctoral Science Foundation of Shaanxi Province(No.2018BSHEDZZ101)。 摘　　要：A valid strategy to tailor the properties of polylactic acid for more extensive applications was introducing filler.In this work,basalt fiber assembled with in-situ SiO_(2) nanoparticles on the surface was successfully prepared via hydrothermal method and it was further treated with coupling agent KH-550 to improve interfacial interaction between polylactic acid(PLA)and basalt fibers(BF).It was demonstrated that the introduction of BFS could increase the crystallization of PLA and resulted in forming trans-crystallization based on TG and DSC results.The tensile strength of PLA/BF composites raised from 39 MPa to 62.5 MPa with increasing the fiber loading from 1 wt%to 10 wt%.Furthermore,the interfacial interaction could be effectively improved by assembling SiO_(2)(especially with 250 nm in diameter)on BF surface to build mechanical locking,which could keep the PLA matrix in place during the mechanical deformation with the tensile strength value raised from 62.5 MPa to 74.0 MPa.It is noticeable that the impact and flexural properties were effectively increased with the incorporation of in-situ SiO_(2) nanoparticles.The further KH-550 treatment made a positive impact as well.For instance,the impact strength and flexural strength of the sample with SiO_(2) and KH-550 modification were improved to 22.49 k J/m^(2) and 146.83 MPa and it enhanced about 42.16%and 41.04%than those of neat PLA,respectively.Therefore,an efficient enhancement of mechanical performance was achieved and this concept of assembling in-situ SiO_(2) on silica-based fiber as a modifier was a novel and simple path to design the interfacial construction and properties of the polymer composites. 关 键 词：Poly(lactic acid) Basalt fiber Silica nanoparticles In-situ assembled Interface interaction
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