Fracture of polypropylene: 1. The effect of molecular weight and temperature at low and high test speed
Fracture of polypropylene: 1. The effect of molecular weight and temperature at low and high test speed
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DOI：
10.1016/s0032-3861(97)10278-6
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发表时间：
1998-10
期刊：
影响因子：
4.6
通讯作者：
A. V. D. Wal;J. Mulder;H. Thijs;R. J. Gaymans
中科院分区：
文献类型：
--
作者：
A. V. D. Wal;J. Mulder;H. Thijs;R. J. Gaymans
研究了聚丙烯在冲击条件下结晶度对断裂行为的影响。通过采用低和高全同立构聚丙烯及其混合物来改变结晶度。结晶度范围为31 - 53wt%。断裂行为作为温度的函数通过在1 ms −1的缺口悬臂梁上进行拉伸试验来研究。脆韧转变温度（Tbd）随着结晶度的增加而增加，这主要归因于屈服应力的增加。在脆性断裂的情况下，断裂能随结晶度的增加而降低。在韧性断裂的情况下，断裂能似乎保持恒定，与结晶度无关。
The effect of crystallinity on the fracture behaviour of polypropylene was studied under impact conditions. The crystallinity was varied by taking low- and high-isotactic polypropylenes and mixtures thereof. The crystallinity ranged from 31 to 53wt%. The fracture behaviour was studied as a function of temperature by means of a tensile test on notched Izod bars at 1ms−1. The brittle-to-ductile transition temperature (Tbd) increases with increasing crystallinity, which is primarily attributed to the increasing yield stress. In the case of brittle fracture, the fracture energy decreases with increasing crystallinity. In the case of ductile fracture, the fracture energy seems to remain constant, irrespective of the crystallinity.