Morphology of ABC Star Copolymers from Weak to Strong Segregation Regimes by Dissipative Particle Dynamics
Date Issued
2007
Date
2007
Author(s)
Fang, Hsin-Kai
DOI
zh-TW
Abstract
We employ the dissipative particles dynamics (DPD) to examine the ABC star copolymers which enrich the interesting structures. The phase triangle of ABC star copolymer is built under the equal and moderate interaction parameters (a). The microphase-separated morphology variation in terms of the interaction parameter a and composition ratio 1：1：X. is also investigated in this work. We compare with the previous simulation techniques, including self-consistent field theory (SCFT) and Monte Carlo simulations (MC). The results are not merely similar, and more importantly, they display that the interaction parameter plays an indispensable role to the phase behavior. In addition, it is interesting that the peculiar segmented wormlike micelles in ABC star copolymer solutions are detected. Although this structure is still unable to be demonstrated in the melt at present, we verify the rationality of this structure via the experimental and theoretical system using poly(ethylethylene)- poly(ethylene oxide)-poly(perfluoropropylene oxide) (EOF) star copolymers in selective solvents. In addition, we also generalize that the morphology is influenced deeply by the length of the polymer chains at the lower interaction parameter. The longer chain will form the domains alone, and the shorter chain will mix each other or disperse in the interface.
Subjects
耗散粒子動力學
自洽場理論
蒙地卡羅模擬方法
選擇性溶劑
蟲形微胞
dissipative particles dynamics (DPD)
ABC star copolymers
self-consistent field theory
Monte Carlo simulations
selective solvents
segmented wormlike micelles
Type
thesis
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