Zha Liyun, Zhang Miaomiao, Li Liangbin, Hu Wenbing
School of Chemistry and Chemical Engineering, State Key Lab of Coordination Chemistry, Nanjing University , Nanjing 210023, China.
Lab of Soft Matter Chemistry, Chinese University of Science and Technology , Hefei 230026, China.
J Phys Chem B. 2016 Dec 22;120(50):12988-12992. doi: 10.1021/acs.jpcb.6b08399. Epub 2016 Dec 12.
Enhancing the dynamic asymmetry between liquid-like and solid-like components leads to spontaneous segregation. As a typical example, the binary blends of stretched and free guest polymers were investigated by our dynamic Monte Carlo simulations. The results evidenced an entropic driving force for the strain-induced segregation between two components, similar to that for Onsager's lyotropic liquid crystals. In addition, with the decrease of strain rates, its competition with strain-induced crystal nucleation results in variable compositions in crystal precursors. The scenario helps to settle down the controversial arguments on the flow-induced precursors of shish-kebab crystallites in the melt.
增强类液体和类固体组分之间的动态不对称性会导致自发相分离。作为一个典型例子，我们通过动态蒙特卡罗模拟研究了拉伸和自由客体聚合物的二元共混物。结果证明了两种组分之间应变诱导相分离的熵驱动力，这与昂萨格溶致液晶的情况类似。此外，随着应变速率的降低，它与应变诱导的晶体成核之间的竞争导致晶体前驱体中组成可变。这种情况有助于解决关于熔体中串晶流动诱导前驱体的争议性争论。
