摘要
选用热塑性聚氨酯弹性体(TPU)提升温差疲劳载荷下丙烯腈-丁二烯-苯乙烯共聚物(ABS)耐应力开裂性能。研究了TPU的引入对温差疲劳载荷下材料力学性能和相态结构的影响,从流变性能和动态力学性能入手分析材料熔体弹性信息及界面流动行为,探讨了TPU含量对温差疲劳前后材料强度保留率的影响。实验结果表明,TPU中软段可以作为ABS基体中“等效橡胶”相,从而减小熔体流动阻力和温差疲劳引起的熔体黏度差异,同时提高温差疲劳后材料强度保留率。引入TPU组分后,复合材料断面空穴形态变化放大了温差疲劳过程中基体胀缩的物理损伤,同时消耗了温差疲劳损伤,提高了材料的耐温差疲劳性能,有利于减弱温差对ABS性能的影响,减少材料开裂,延长制品使用寿命。
Thermoplastic polyurethane elastomer(TPU)was selected to improve the stress cracking resistance of acrylonitrile butadiene-styrene copolymer(ABS)under temperature differential fatigue loading.The effects of the introduction of TPU on mechanical properties and phase structures of the copolymer under temperature differential fatigue were studied.The elastic information of the copolymer melt and the flow behavior at the interface was analyzed from the rheological properties and dynamic thermomechanical properties.The effects of TPU content on the strength retention of the copolymer before and after temperature differential fatigue were discussed.The experimental results show that the soft segments of TPU serve as"equivalent rubber"phase in ABS,which reduces the melt flow resistance and melt viscosity difference caused by temperature fatigue,and improves the strength retention ratio of the copolymer after temperature fatigue.By introducing TPU,the change in the sectional morphologies of the cavity magnifies the physical damage caused by matrix expansion and contraction in the process of temperature difference fatigue,and also reduces the temperature difference fatigue damage,which improves the temperature difference fatigue performance of the material,which is beneficial to weaken the influence of temperature difference on the performance of ABS,reduce material cracking,and extend the service life of the product.
作者
曾威
李冉
王钊智
苏情
王劭妤
王孝军
Wei Zeng;Ran Li;Zhaozhi Wang;Qing Su;Shaoyu Wang;Xiaojun Wang(College of Chemical Engineering and Materials,Tianjin University of Science and Technology,Tianjin 300457,China;Analysis and Test Center,Sichuan University,Chengdu 610064,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2021年第11期117-124,共8页
Polymer Materials Science & Engineering
关键词
热塑性聚氨酯弹性体
温差疲劳
等效橡胶
开裂
力学性能
thermoplastic polyurethane elastomer
temperature fatigue
equivalent rubber
cracking
mechanical properties
