Phase morphology and impact toughness of impact polypropylene copolymer
Phase morphology and impact toughness of impact polypropylene copolymer
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DOI：
10.1016/j.polymer.2005.02.088
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发表时间：
2005-04
期刊：
影响因子：
4.6
通讯作者：
H. Tan;Li Li-Li;Zhineng Chen;Yihu Song;Q. Zheng
中科院分区：
文献类型：
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作者：
H. Tan;Li Li-Li;Zhineng Chen;Yihu Song;Q. Zheng
采用温度梯度萃取分馏（TGEF）、扫描电镜（SEM）、核磁共振（NMR）和差示扫描量热法（DSC）研究了乙烯含量、分子量和分子量分布几乎相同的两种冲击聚丙烯共聚物（IPC）的冲击韧性影响因素。结果表明，分散相与连续基体的界面附着力差，分散相尺寸较大，分散相分布不均匀是IPC B冲击韧性低的主要原因，因为分散相与连续基体之间具有较长的可结晶PE和PP序列作为相容剂的乙烯-丙烯段共聚物含量低。
Factors influencing the impact toughness of two impact polypropylene copolymers (IPC) with almost the same ethylene content, molecular weight and molecular weight distribution were studied by temperature gradient extraction fractionation (TGEF), scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). The results indicate that poor interfacial adhesion between the disperse phase and the continuous matrix, larger dimensions and non-uniform distribution of disperse phases are main reasons for the low impact toughness of IPC B that possesses of a low content of ethylene–propylene segmented copolymer with long crystallizable PE and PP sequences as a compatibilizer between the disperse phase and the matrix.