Polydispersity Effect on Phase Behavior of Diblock Copolymer

doi:10.3969/j.issn.0251-0790.2012.05.046

Abstract

Abstract: Effect of polydispersity on phase behavior of diblock copolymer was studied by Monte Carlo simulation. In order to evaluate the polydispersity effect, block copolymer blends including three different components were utilized as models in the simulation. By controlling the weight fractions of the component in copolymer blend, the influence of two different types of polydispersity effects (i.e. overall polydispersity effect and single block polydispersity effect, respectively) on order-disorder transition(ODT), conformations, and chain size of polymers were investigated. The results show that the increasing of index of polydispersity(PDI) can cause the ODT temperature slightly shifts to a lower temperature region. And it can also induce the increasing of the spacing thickness of the newly formed lamellar structure. Based on microscopic conformation analysis, polymer chains tend to stretch more at larger PDIs, which reveals the decreasing of accumulation degree of polymer chains. Therefore, the inhibition effect on fluctuation diminishes and the disordered phase shifts to the lower temperature region.

Key words: Monte Carlo simulation, Polydispersity effect, Diblock copolymer, Phase behavior

CLC Number:

O631

TrendMD:

YAO Wei-Guo, ZHOU Hong-Mei, DOU Yan-Li, ZHAO Xue, HOU Lin. Polydispersity Effect on Phase Behavior of Diblock Copolymer[J]. Chem. J. Chinese Universities, 2012, 33(05): 1116.

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Polydispersity Effect on Phase Behavior of Diblock Copolymer

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