Microphase separation in brushes capable of liquid crystal ordering

被引：0

作者：

Darinskij, A.A. ^{[1
]}

Tupitsyna, A.I. ^{[1
]}

Birshtejn, T.M. ^{[1
]}

Saf'yannikova, M.G. ^{[1
]}

Amoskov, V.M. ^{[1
]}

Emri, I. ^{[1
]}

机构：

[1] Inst. of Macromolecular Compounds, RAS, Bol'shoi pr. 31, Sankt-Peterburg, 199004, Russia

来源：

| 2003年 / MAIK Nauka卷 / 45期

关键词：

Graft copolymers - Mathematical models - Phase separation - Phase transitions;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The behavior of an anisotropic polymer brush in a continuous medium with varying grafting density σ and anisotropic interaction parameter η was studied by a method based on the combination of Brownian dynamics and mean-field algorithms. It was shown that, as η in a brush with small σ values changes, stepwise phase transitions from the state of a conventional brush to the microphase-separated or the fully liquid crystalline state (forward transition with an increase in η), as well as from the microphase-separated brush to the conventional brush (reverse transition with a decrease in η), takes place. Hysteresis effects are displayed for these transitions. A comparison of the results obtained in terms of the continuum model and the model of walk on a simple cubic lattice showed that transition scenarios are independent of the model selected and the quantitative differences in transition characteristics are due to the difference in entropic effects.

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