Boundary-induced segregation in nanoscale thin films of athermal polymer blends

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题名:	Boundary-induced segregation in nanoscale thin films of athermal polymer blends
作者:	曹恆光;Teng, Chih-Yu;Sheng, Yu-Jane;Tsao, Heng-Kwong
贡献者:	工學院化學工程與材料工程學系
关键词:	Boundaries;Dynamics;Homogeneity;Nanostructure;Polymer blends;Segregations;Stars;Thin films
日期:	2016-01-01
上传时间:	2026-04-21 14:44:19 (UTC+8)
出版者:	Royal Society of Chemistry;England: Royal Society of Chemistry (RSC)
摘要:	摘要： The surface segregation of binary athermal polymer blends confined in a nanoscale thin film was investigated by dissipative particle dynamics. The polymer blend included linear/linear, star/linear, bottlebrush/linear, and rod-like/linear polymer systems. The segregation was driven by purely entropic effects and two different mechanisms were found. For the linear/linear and star/linear polymer blends, the smaller sized polymers were preferentially segregated to the boundary because their excluded volumes were smaller than those of the matrix polymers. For the bottlebrush/linear and rod-like/linear polymer blends, the polymers with a larger persistent length were preferentially segregated to the boundary because they favored staying in the depletion zone by alignment with the wall. Our simulation outcome was consistent with experimental results and also agreed with theoretical predictions - that is, a surface excess dictated by the chain ends for the branch/linear system. These consequences are of great importance in controlling the homogeneity and surface properties of polymer blend thin films. Boundary-induced segregation in athermal rod-like/linear polymer blend thin films. 其他題名： Soft Matter 出版者： England: Royal Society of Chemistry (RSC) 出版日期： 2016-01-01 出處： Soft Matter, 2016-01, Vol.12 (20), p.4603-4610 識別號： ISSN: 1744-683X 識別號： ISSN: 1744-6848 識別號： EISSN: 1744-6848 識別號： DOI: 10.1039/c6sm00559d 識別號： PMID: 27108653
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