Size-dependence and interfacial segregation in nanofilms and nanodroplets of homologous polymer blends

Wan Ju Liao, Kang Ching Chu, Yu Hao Tsao, Heng Kwong Tsao, Yu Jane Sheng

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

The size-dependent behavior of nanofilms and nanodroplets of homologous polymer blends was explored by many-body dissipative particle dynamics. Although a homologous blend can be regarded as a completely miscible and athermal system, enrichment of the surface in short polymers always takes place. First, liquid-gas and solid-liquid interfacial tensions of polymer melts were acquired. It is found that they increase and approach asymptotes with increasing chain lengths. The molecular weight dependence can be depicted using two semi-empirical expressions. Second, the variation of surface tension and surface excess of polymer blend nanofilms with the thickness was observed. Surface tension of the blend is observed to increase but the extent of surface segregation decreases upon increasing the film thickness. Finally, the wetting phenomenon of nanodroplets of homologous blends was examined. The contact angle is found to increase as the droplet size is reduced. Our simulation results indicate that the size-dependence of nanofilms and nanodroplets is closely related to surface segregation in homologous blends.

原文???core.languages.en_GB???
頁(從 - 到)21801-21808
頁數8
期刊Physical Chemistry Chemical Physics
22
發行號38
DOIs
出版狀態已出版 - 14 10月 2020

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