Phase transitions in polymer brushes

被引:32
作者
Birshtein, TM
Amoskov, VM
Mercurieva, AA
Pryamitsyn, VA
机构
[1] Inst. of Macromolecular Compounds, Russian Academy of Sciences, 31 Bolshoy Pr., V.O., 199004, St.-Petersburg
关键词
D O I
10.1002/masy.19971130114
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Liquid crystalline ordering in planar polymer brushes is investigated theoretically by numerical calculations within a self-consistent field approximation. The brushes are formed by macromolecules with mesogenic groups in main chain and immersed in a solvent. Existence of a microphase segregated brush (MSB) regime with a collapsed orientationally ordered intrinsic sublayer and a swollen external sublayer is shown. At small grafting density, the transition from a conventional brush state to the microphase segregated state is a jump-wise first order phase transition for a finite chain length (A?. The magnitudes of the jumps in the average characteristics of the brush tend to zero in the limit N --> infinity since this transition occurs only in a vanishingly small part (proportional to N-1/2) Of the brush. High compressibility of MSB brush is demonstrated. The origin of phase transition in planar brushes is discussed.
引用
收藏
页码:151 / 161
页数:11
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