摘要
通过人工加速老化试验研究并分析了典型汽车内饰用聚丙烯(PP)材料老化后的力学性能、热性能与流动性能变化规律以及红外光谱(FTIR)。结果表明:随着老化时间的增加,PP材料的拉伸强度及弯曲强度均先提升后降低,分别在老化920和680 h时达到峰值;悬臂梁缺口冲击强度则逐步下降。材料老化后其熔体流动性能比老化前均有所下降,但下降程度与老化时间的关系不明显,其中老化480 h的材料流动性能下降幅度最小。当老化时间为720~1 400 h时,材料的流动性能随老化时间的增加而提升。FTIR分析结果显示,材料老化后聚合碳链氧化断裂,产生羧酸类降解产物。
The mechanical properties, thermal properties, molding properties and Fourier transform infrared spectra (FTIR) of aged typical polypropylene (PP) plastics for automotive interior trim were investigated with artificially accelerated aging test. The results show that, with the expansion of aging time, both the tensile strength and bending strength of PP increase first and then decrease, and reach the maximum after aging 920 and 680 h, respectively. The flow property of PP deteriorates after aging (but the relationship between decline degree and aging time is not obvious), and it gets the highest value after aging 480 h. When the aging time is between 720 h and 1 400 h, the flow property gets better with the increasing aging time. The FTIR results show that oxidative breakdown of polymerized carbon chains produces carboxylic acid degradation products after aging test.
作者
蔡航
孟正华
许欢
郭巍
Cai Hang;Meng Zhenghua;Xu Huan;Guo Wei(Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China;Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, WuHan 430070, China)
出处
《塑料科技》
CAS
北大核心
2019年第7期50-54,共5页
Plastics Science and Technology
基金
国家自然科学基金项目(51605356,51305318)
武汉理工大学自主创新研究基金项目(185207009)
新能源汽车科学与关键技术学科创新引智基地资助(B17034)
关键词
聚丙烯
人工加速老化
老化特性
Polypropylene
Artificial accelerated aging test
Aging properties
