结晶
碳纳米管
分子动力学
材料科学
纳米复合材料
纳米管
聚乙烯
化学工程
复合材料
化学物理
纳米技术
化学
计算化学
工程类
作者
Jun Yang,Zongfa Liu,Zhouzhou Gu,Yongqiang Ming,Sumin Li,Tongfan Hao,Yijing Nie
摘要
In the present work, we used molecular dynamics simulations to study the effects of carbon nanotube (CNT) contents on stretch-induced crystallization behavior in CNT filled polyethylene systems. During high-temperature stretching, the stretching is responsible for the orientation of CNTs, which then facilitates segment orientation and conformational transition from the gauche-conformation into the trans-conformation in interfacial regions. The systems with higher CNT contents have a higher degree of orientation and higher contents of trans-conformation during stretching, resulting in the formation of more precursors. During subsequent crystallization, the initial crystallization rate increases with the increase of the CNT content due to the increase in precursor contents in interfacial regions. However, after the CNT content exceeds a certain value, a filler network would be formed by CNTs, which can restrict chain movements and then lead to a decrease in the overall crystallization rate in the systems with high CNT contents.
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