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Differences in Crystallization Behaviors between Cyclic and Linear Polymer Nanocomposites
Chinese Journal of Polymer Science ( IF 4.3 ) Pub Date : 2020-04-21 , DOI: 10.1007/s10118-020-2403-0
Rong-Juan Liu , Zhi-Ping Zhou , Yong Liu , Zhao-Peng Liang , Yong-Qiang Ming , Tong-Fan Hao , Yi-Jing Nie

Cyclic polymers exhibit fascinating crystallization behaviors owing to the absence of chain ends and more compact conformations. In the current simulation, dynamic Monte Carlo simulations were performed to reveal the underlying mechanism of the effect of chain topology and chain length on crystallization of polymer in solutions containing one-dimensional nanofiller. Simulation results suggested that the filled cyclic polymers exhibit higher melting temperature, higher crystallization temperature, and faster crystallization rate than the analogous linear polymers of identical chain length, especially in the systems with relatively short chains. Based on the Thomson-Gibbs equation, we theoretically analyzed the difference in the melting point between the cyclic and linear polymers under different chain lengths, and derived the dependence of the ratio of the melting point of the linear polymers to that of its cyclic analogs on chain length. In addition, it was also observed that the nanofiller can induce the formation of nanohybrid shish-kebab structure during isothermal crystallization of all systems.



中文翻译:

环状和线性聚合物纳米复合材料结晶行为的差异

由于不存在链端和更紧密的构象,环状聚合物表现出令人着迷的结晶行为。在当前的模拟中,进行了动态蒙特卡洛模拟以揭示链拓扑和链长对含一维纳米填料的溶液中聚合物结晶的影响的潜在机理。仿真结果表明,与相同链长的类似线性聚合物相比,填充的环状聚合物表现出更高的熔融温度,更高的结晶温度和更快的结晶速率,尤其是在具有相对短链的体系中。基于Thomson-Gibbs方程,我们从理论上分析了不同链长下环状和线性聚合物之间的熔点差异,并推导了线性聚合物与其环状类似物的熔点之比与链长的关系。另外,还观察到纳米填料可以在所有系统的等温结晶过程中诱导纳米杂化烤肉串结构的形成。

更新日期:2020-04-23
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