超临界氮气制备热塑性聚氨酯发泡材料及其性能  

Preparation and properties of thermoplastic polyurethane foam by supercritical nitrogen

作　　者：张湘汉 钟笑笑 罗水源 郭江彬 朱君秋 ZHANG Xiang-han;ZHONG Xiao-xiao;LUO Shui-yuan;GUO Jiang-bin;ZHU Jun-qiu(College of Chemical Engineering and Materials Science,Fujian Engineering and Research Center of Green and Environment-friendly Functional Footwear Materials,Quanzhou Normal University,Quanzhou 362000,China)

机构地区：[1]泉州师范学院化工与材料学院/福建省绿色环保功能鞋材工程研究中心,福建泉州362000

出　　处：《合成橡胶工业》2020年第5期402-406,共5页China Synthetic Rubber Industry

基　　金：福建省中青年教师教育科研资助项目(JAT 170488,JT 180366);泉州市科技计划资助项目(2019 C 106,2017 G 006,2017 ZT 001);泉州师范学院引进人才科研启动经费资助项目(H 17015)。

摘　　要：将超临界氮气与热塑性聚氨酯(TPU)熔融共混后,通过注塑成型制备了发泡TPU,考察了TPU的流变性能,并对比了TPU发泡前后的分子链结构、热稳定性、玻璃化转变温度及物理机械性能。结果表明,相比于TPU,发泡TPU的热稳定性有所提高,玻璃化转变温度降低,熔融温度和结晶温度升高。发泡TPU的密度、邵尔A硬度、扯断伸长率及杨氏模量均有所下降,回弹率和热收缩率有所提高,这均与超临界氮气在TPU中形成的泡孔结构有关。The foaming thermoplastic polyurethane(TPU)was prepared by injection molding after the melt blending of supercritical nitrogen and TPU.The rheological properties of TPU were investigated.And the molecular chain structure,thermal stability,glass transition temperature and physical and mechanical properties of TPU before and after foaming were compared.The results showed that compared with TPU,the thermal stability of foamed TPU was improved,the glass transition temperature decreased,the melting temperature and crystallization temperature increased.The density,Shore A hardness,elongation at break and Young′s modulus of foamed TPU all decreased,while the rebound rate and thermal shrinkage increased,which were related to the pore structure of supercritical nitrogen in TPU.

关 键 词：热塑性聚氨酯 超临界氮气 发泡材料 流变性能 物理机械性能 热稳定性 

分 类 号：TQ328.3[化学工程—合成树脂塑料工业]