Influence of Small-Scale Correlation on the Interface Evolution of Semiflexible Homopolymer Blends
Influence of Small-Scale Correlation on the Interface Evolution of Semiflexible Homopolymer Blends
复制标题
DOI：
10.1021/acsomega.0c00421
复制
发表时间：
2020-03
期刊：
影响因子：
4.1
通讯作者：
Xinxiang Chen;S. Qi;Xinghua Zhang;Dadong Yan
中科院分区：
文献类型：
--
作者：
Xinxiang Chen;S. Qi;Xinghua Zhang;Dadong Yan
在动态自洽场理论的框架下，以半柔性均聚物共混物为模型系统，研究了小尺度关联对聚合物动力学的影响。这是通过将理想半柔性链的对关联函数作为Onsager系数，将德拜函数作为Onsager系数的近似值来实现的。依靠两对相关函数在小尺度区域的差异，我们可以识别小尺度相关的影响。在平衡态下，随着链长的增加，界面宽度从等高线长度向回转半径连续过渡。界面演化和链取向的研究表明，较强的小尺度关联将加速小尺度动力学过程。我们还预计，在发生微观相分离的过程中，应该突出这种小尺度效应。
Within the framework of a dynamic self-consistent field theory, we study the effect of the correlations in a small scale on polymer dynamics, adopting the semiflexible homopolymer blends as the model system. This is accomplished by taking the pair correlation function of ideal semiflexible chains as the Onsager coefficient and the Debye function as an approximation to the Onsager coefficient. Relying on the difference of the two pair correlation functions in the small-scale region, we can identify the effect of small-scale correlations. In the equilibrium state, with the chain length growing, the interface width has a continuous transition from the contour length to radius of gyration. The investigation of interfacial evolution and chain orientation reveals that strong small-scale correlations would accelerate the small-scale dynamic process. We also expect that such a small-scale effect should be highlighted in the process where microscopic phase separation happens.