Compression induced phase transition of nematic brush: A mean-field theory study
文献类型：期刊论文
| 作者 | Tang, Jiuzhou1; Zhang, Xinghua2; Yan, Dadong3 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2015-11-28 |
| 卷号 | 143期号:20 |
| 英文摘要 | Responsive behavior of polymer brush to the external compression is one of the most important characters for its application. For the flexible polymer brush, in the case of low grafting density, which is widely studied by the Gaussian chain model based theory, the compression leads to a uniform deformation of the chain. However, in the case of high grafting density, the brush becomes anisotropic and the nematic phase will be formed. The normal compression tends to destroy the nematic order, which leads to a complex responsive behaviors. Under weak compression, chains in the nematic brush are buckled, and the bending energy and Onsager interaction give rise to the elasticity. Under deep compression, the responsive behaviors of the nematic polymer brush depend on the chain rigidity. For the compressed rigid polymer brush, the chains incline to re-orientate randomly to maximize the orientational entropy and its nematic order is destroyed. For the compressed flexible polymer brush, the chains incline to fold back to keep the nematic order. A buckling-folding transition takes place during the compressing process. For the compressed semiflexible brush, the chains are collectively tilted to a certain direction, which leads to the breaking of the rotational symmetry in the lateral plane. These responsive behaviors of nematic brush relate to the properties of highly frustrated worm-like chain, which is hard to be studied by the traditional self-consistent field theory due to the difficulty to solve the modified diffusion equation. To overcome this difficulty, a single chain in mean-field theory incorporating Monte Carlo simulation and mean-field theory for the worm-like chain model is developed in present work. This method shows high performance for entire region of chain rigidity in the confined condition. (C) 2015 AIP Publishing LLC. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2016-02-25 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/29508]  |
| 专题 | 化学研究所_高分子物理与化学实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China 2.Beijing Jiaotong Univ, Sch Sci, Beijing 100044, Peoples R China 3.Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Jiuzhou,Zhang, Xinghua,Yan, Dadong. Compression induced phase transition of nematic brush: A mean-field theory study[J]. JOURNAL OF CHEMICAL PHYSICS,2015,143(20). |
| APA | Tang, Jiuzhou,Zhang, Xinghua,&Yan, Dadong.(2015).Compression induced phase transition of nematic brush: A mean-field theory study.JOURNAL OF CHEMICAL PHYSICS,143(20). |
| MLA | Tang, Jiuzhou,et al."Compression induced phase transition of nematic brush: A mean-field theory study".JOURNAL OF CHEMICAL PHYSICS 143.20(2015). |
入库方式： OAI收割
来源：化学研究所
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