Effect of αc-relaxation on the large strain cavitation in polyethylene
Effect of αc-relaxation on the large strain cavitation in polyethylene
复制标题
α-弛豫对聚乙烯大应变空化的影响
DOI：
10.1016/j.polymer.2020.123049
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发表时间：
2020-12
期刊：
影响因子：
4.6
通讯作者：
Men Yongfeng
中科院分区：
文献类型：
--
作者：
Lu Ying;Lyu Dong;Tang Yujing;Qian Li;Qian Yanan;Xiang Mingyue;Men Yongfeng
高密度聚乙烯（HDPE）在很宽的拉伸温度范围内都出现了大应变空穴现象，这与高取向无定形网络的断裂有关。在HDPE中引发这种空化的临界应力表现出强烈的拉伸温度依赖性。确定了在不同拉伸状态下影响大应变空泡临界应力值的两个关键因素。在70 °C以下，HDPE在大应变空泡发生前的重量堆积是导致大应变空泡临界应力变化的主要原因。这些差异导致在高度取向的无定形网络中的承重间原纤/微原纤连接链的数量的变化，最终改变宏观临界应力。在70 °C以上，大应变空蚀临界应力的持续降低可以解释为α c弛豫导致的激活链扩散。由于HDPE的取向原纤网络在α c松弛激活后处于动态状态，其稳定性下降。从而降低了大应变空化的临界应力。
The large strain cavitation associated with the fragmentation of the highly oriented amorphous network was observed in the high density polyethylene (HDPE) samples over a wide range of stretching temperatures. The critical stress for initiating this cavitation in HDPE showed a strong stretching temperature dependency. Two key factors affecting the value of the critical stress for initiating large strain cavitation at different stretching regimes have been identified. Below 70 °C, the distinct weight crystallinities of HDPE at the state just before large strain cavitation were confirmed to be responsible for the change of critical stress for large strain cavitation. These differences led to a change in the number of load-bearing inter-fibrils/micro-fibrils tie chains in the highly oriented amorphous network, eventually altering the macroscopic critical stress. Above 70 °C, the continuous reduction of critical stress for large strain cavitation could be interpreted by the activation chain-diffusion inside the crystallites due to αc-relaxation. As the whole oriented fibril network of HDPE was in a dynamic state after the activation of αc-relaxation, the stability of this oriented network decreased. Thus, the critical stress for large strain cavitation reduced.
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影响因子：
5.5
作者：
Chang, Baobao;Schneider, Konrad;Heinrich, Gert
通讯作者：
Heinrich, Gert
影响因子：
4.6
作者：
Hedesiu, Cristian;Demco, Dan E.;Litvinov, Victor M.
通讯作者：
Litvinov, Victor M.
DOI：
10.1080/00222347308245795
发表时间：
1973-10
期刊：
Journal of Macromolecular Science, Part B
影响因子：
--
作者：
A. Peterlin
通讯作者：
A. Peterlin
预取向聚丙烯薄膜拉伸时空化的引发：原位 SAXS 和 WAXD 研究
影响因子：
4.6
作者：
Xiong, Bijin;Kang, Jian;Men, Yongfeng
通讯作者：
Men, Yongfeng
影响因子：
4.6
作者：
M. I. A. E. Maaty;D. Bassett;R. Olley;M. Dobb;J. Tomka;I. Wang
通讯作者：
M. I. A. E. Maaty;D. Bassett;R. Olley;M. Dobb;J. Tomka;I. Wang