Thermodynamics of strain-induced crystallization of random copolymers.
Thermodynamics of strain-induced crystallization of random copolymers.
复制标题
DOI：
10.1039/c3sm52465e
复制
发表时间：
2014-01
期刊：
影响因子：
3.4
通讯作者：
Y. Nie;Huanhuan Gao;Yixian Wu;Wenbing Hu
中科院分区：
文献类型：
--
作者：
Y. Nie;Huanhuan Gao;Yixian Wu;Wenbing Hu
工业半结晶聚合物含有各种序列缺陷，其表现类似于无规共聚物上的不可结晶共聚单体单元。我们进行了动态Monte Carlo模拟的应变诱导结晶的无规共聚物与不同含量的共聚单体在高温下。我们观察到，随着共聚单体含量和温度的增加，结晶的起始应变移动。Flory关于无规共聚物熔点下移和应变诱导结晶熔点上移的理论可以很好地预测这些行为。我们的热力学结果对于我们理解橡胶应变硬化、塑料成型、薄膜拉伸以及纤维纺丝都是非常重要的。
Industrial semi-crystalline polymers contain various kinds of sequence defects, which behave like non-crystallizable comonomer units on random copolymers. We performed dynamic Monte Carlo simulations of strain-induced crystallization of random copolymers with various contents of comonomers at high temperatures. We observed that the onset strains of crystallization shift up with the increase of comonomer contents and temperatures. The behaviors can be predicted well by a combination of Flory's theories on the melting-point shifting-down of random copolymers and on the melting-point shifting-up of strain-induced crystallization. Our thermodynamic results are fundamentally important for us to understand the rubber strain-hardening, the plastic molding, the film stretching as well as the fiber spinning.