Self-assembly of amphiphilic liquid crystal block copolymers containing a cholesteryl mesogen: Effects of block ratio and solvent

被引：57
作者：
Jia, Lin [1 ,2 ]
Albouy, Pierre-Antoine [3 ]
Di Cicco, Aurelie [2 ]
Cao, Amin [1 ]
Li, Min-Hui [2 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Organ Chem, Lab Polymer Mat, Shanghai 200032, Peoples R China
[2] Univ Paris 06, Inst Curie, CNRS, Lab Phys Chim Curie,UMR168, F-75248 Paris 05, France
[3] Univ Paris 11, Lab Phys Solides, CNRS, UMR8502, F-91405 Orsay, France
来源：
POLYMER | 2011年 / 52卷 / 12期
基金：
美国国家科学基金会;
关键词：
Amphiphilic block copolymers; Liquid crystals; Self-assembly; DIBLOCK COPOLYMERS; POLYMER VESICLES; MICELLES; CONFORMATION; MORPHOLOGIES; ARCHITECTURE; NANOWIRES; DELIVERY; BEHAVIOR; LENGTH;
D O I：
10.1016/j.polymer.2011.04.001
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We report on the self-assembly, in water and in bulk, of amphiphilic liquid crystal block copolymers consisting of a cholesterol-based smectic LC polymer block (PAChol) and poly(ethylene glycol) (PEG) block. Two series of block copolymers. PEG(45)-b-PAChol and PEG(114)-b-PAChol (45 and 114 are the degree of polymerization of PEG blocks) with different hydrophilic/hydrophobic weight ratios were synthesized and characterized in detail. Depending on the diblock composition, smectic polymer vesicles and/or nanofibers were formed by adding water into a dilute solution of copolymers in dioxane. If THF is used instead of dioxane as solvent, solid spherical aggregates were obtained upon water addition for PEG(45)-b-PAChol series, while macroscopic precipitation occurred for PEG(114)-b-PAChol series. The mesomorphic and microphase segregation structures of the block copolymers in bulk were studied by X-ray scattering, DSC and POM. The interdigital smectic A (SmA(d)) phase with a lamellar period of 4.25 nm was detected in all block copolymers. For PEG(114)-b-PAChol(5) (PEG/PAChol weight ratio = 66/34) and PEG(114)-b-PAChol(12) (45/55), lamellar type of microphase segregation was observed. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2565 / 2575
页数：11
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