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Synthesis of waterborne polyurethane using snow as dispersant:Structures and properties controlled by polyols utilization

查看全文 作　　者：Changqing [1,2]Fang;Shaofei [1]Pan;Zhen [1,2]Wang;Xing [1,2]Zhou;Wanqing [1,2]Lei;Youliang [1,2]Cheng 高影响力作者 机构地区：[1]Faculty of Printing,Packaging Engineering and Digital Media Technology,Xi'an University of Technology,Xi'an,710048,China;[2]School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an,710048,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第7期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant No. 51772243);PhD Research Startup Foundation of Xi’an University of Technology (Grant No. 108256081703);Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University (Grant No. FQS-201709);the Innovative Team Support Program (2017KCT-17);Key Laboratory of Processing and Quality Evaluation Technology of Green Plastics of China National Light Industry Council, Beijing Technology and Business University (Grant No. BS201702);the China Postdoctoral Science Foundation Funded Project (Grant No. 2016M592824);the Science and Technology Plan of Yulin City (Grant No. 2016-16-7), and the Science and Technology Plan of Beilin District (Grant No. GX1710) 摘　　要：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. 关 键 词：WATERBORNE polyurethane (WPU) SNOW Soft segment Polyester POLYETHER
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