摘要
以聚己内酯二醇,六亚甲基二异氰酸酯(HDI),1,4-丁二醇(BDO)为原料,选取硬段(HDI+BDO)含量为30%~37%,合成一系列不同硬段含量的脂肪族热塑性聚氨酯(PUR-T)弹性体,将PUR-T与PVC进行共混,研究了PUR-T的硬段含量以及用量对PVC/PUR-T共混物力学性能的影响,并利用动态力学性能分析研究了共混物的耐低温性能。结果表明,随着硬段含量的提高,PUR-T的拉伸强度和断裂伸长率先增加后降低,而硬度和撕裂强度先增加后趋于稳定。不同硬段含量的PUR-T与PVC共混后,其力学性能变化趋势基本与PUR-T的相同,当PUR-T硬段含量为32%时,共混物具有较好的综合力学性能。随着PUR-T用量的增加,共混物的力学性能逐渐提升,其中断裂伸长率和撕裂强度的变化最为明显。PUR-T与PVC共混后,损耗因子–温度曲线只存在一个玻璃化转变温度(Tg)峰,说明两者有较好的相容性;PUR-T的加入使T_g峰向低温移动,并降低了共混物在低温下的储能和损耗模量,显著改善了PVC的耐低温性能。
Using Polycarbolactone glycol,methyl diisocyanate(HDI),1,4-butyl glycol(BDO)as the raw materials,selecting the hard segment(HDI+BDO)content between30%and37%,a series of aliphatic thermoplastic polyurethane elastomer(PUR-T)with different hard segment contents were synthesized.The PUR-T and PVC were blended and the effects of hard segment content and PUR-T content on mechanical properties of the PVC/PUR-T blend were studied,the low temperature resistance of the blend was also studied by using dynamic mechanical analysis.The results show that with the increase of hard segment content,the tensile strength and elongation at break of PUR-T first increase and then decrease,hardness and tear strength first increase and then stabilize,when PUR-T with different hard segment contents were blended with PVC,the mechanical properties of the blends has the same change.When the hard segment content of PUR-T is32%,the blend has the better mechanical properties.With PUR-T content increasing,the mechanical properties of the blends improve gradually,and the elongation at break and tear strength change obviously.When PVC is blended with PUR-T,loss factor-temperature curve has only glass transition temperature(Tg)peak,which indicates PVC and PUR-T have good compatibility,the adding of PUR-T causes Tg peak to move to the low temperature,reduces the storage and loss modulus at low temperature,improves the low temperature resistance of PVC significantly.
作者
张兴东
韩间涛
李荣勋
孙立水
Zhang Xingdong;Han Jiantao;Li Rongxun;Sun Lishui(Engineering Research Center of High Performance Polymer and Molding Technology of Ministry of Education,Qingdao University of Science and Technology, Qingdao 266042, China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2017年第11期46-50,共5页
Engineering Plastics Application
基金
国家重大科学仪器设备开发专项项目(2012YQ230043)
关键词
聚氯乙烯
脂肪族热塑性聚氨酯
力学性能
动态力学性能分析
耐低温性能
polyvinyl chloride
aliphatic thermoplastic polyurethane
mechanical property
dynamic mechanical analysis
low temperature resistance
