Phase and orientational behaviors in liquid crystalline main-chain/side-group block copolymers

被引:0
|
作者
Ferri, D
Wolff, D
Springer, J
Francescangeli, O
Laus, M
Angeloni, AS
Galli, G
Chiellini, E
机构
[1] Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy
[2] Tech Univ Berlin, Inst Tech Chem, D-10623 Berlin, Germany
[3] Univ Ancona, Dipartimento Sci Mat & Terra, I-60131 Ancona, Italy
[4] Univ Bologna, Dipartimento Chim Ind & Mat, I-40136 Bologna, Italy
关键词
liquid crystal; block copolymer; polyester block; polymethacrylate block; magnetic field; X-ray diffraction;
D O I
10.1002/(SICI)1099-0488(19980115)36:1<21::AID-POLB3>3.3.CO;2-M
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The phase and orientational behaviors of a series of liquid crystalline (LC) AB-type diblock copolymers comprising thermotropic main-chain (MC) polyester and side-group (SG) polymethacrylate blocks were investigated by X-ray diffraction. The MC and SG blocks were phase separated and gave rise to their individual mesophases that coexisted at equilibrium. The samples were oriented by using either a magnetic field or a mechanical field. In magnetically aligned samples both the MC and SG microphases were oriented with their smectic planes orthogonal to the magnetic field direction, independent of the copolymer composition. Mechanically aligned, fiber samples showed different orientations of the MC and SG smectic planes for different sample compositions. In this case the disposition of the smectic planes of the MC and SG blocks was driven by the relative length of the two blocks. Some features of the X-ray patterns of the copolymers were compared to those of the MC and SG homopolymers. In addition, the MC smectic domains crystallized on annealing without affecting the orientation that had been achieved by applying a magnetic field. (C) 1998 John Wiley & Sons, Inc.
引用
收藏
页码:21 / 29
页数:9
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