材料科学
战术性
韧性
差示扫描量热法
聚酯纤维
扫描电子显微镜
聚丙烯
复合材料
成核
艾氏冲击强度试验
高分子化学
聚合物
聚合
有机化学
极限抗拉强度
化学
热力学
物理
作者
Jingru Liu,Hongwei Liang,Chen Li,Fangming Hu
摘要
The effect of phenyl‐terminated hyperbranched polyester (HBP‐Bz) with different generation (the first generation and the fourth generation) as a special β‐nucleating agent on the toughness of isotactic polypropylene (iPP) was investigated by dynamic rheological measurements, scanning electron microscopy, differential scanning calorimetry, wide‐angle X‐ray diffraction, polarized optical microscopy, and mechanical properties measurements. The results show that the β nucleating activity of HBP‐Bz significantly depends on its concentration and molecular structure. The relative content of β‐crystal form ( K β ) increases with the increasing HBP‐Bz percentage reaches a maximum and then decreases as HBP‐Bz percentage further increases. The K β values of iPP/HBP‐G1‐1% and iPP/HBP‐G4‐1% blends are 26.52% and 20.80%, respectively. When compared with HBP‐G4, HBP‐G1 has incompact molecular structure, facilitating the π–π interaction between phenyl‐terminated groups and the helix chains of iPP crystallize on it, and therefore relatively good dispersibility, high β nucleating activity and excellent toughening effect are obtained. The impact strength of iPP was dramatically improved, especially with addition of 1 wt% HBP‐G1. POLYM. ENG. SCI., 59:E133–E143, 2019. © 2018 Society of Plastics Engineers
科研通智能强力驱动
Strongly Powered by AbleSci AI