Self-Assembly of Coil/Liquid-Crystalline Diblock Copolymers in a Liquid Crystal Solvent

被引:9
|
作者
Scruggs, Neal R. [1 ]
Verduzco, Rafael [1 ]
Uhrig, David [2 ]
Khan, Waliullah [3 ]
Park, Soo-Young [3 ]
Lal, Jyotsana [4 ]
Kornfield, Julia A. [1 ]
机构
[1] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA
[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[3] Kyungpook Natl Univ, Dept Polymer Sci, Taegu 702701, South Korea
[4] Argonne Natl Lab, Intense Pulsed Neutron Source, Argonne, IL 60439 USA
基金
美国国家科学基金会;
关键词
SIDE-CHAIN POLYMERS; ASYMMETRIC BLOCK-COPOLYMERS; PHASE-BEHAVIOR; NEMATIC SOLVENTS; ANIONIC-POLYMERIZATION; CONCENTRATED-SOLUTIONS; TRIBLOCK COPOLYMERS; VARYING SELECTIVITY; MIXTURES; DYNAMICS;
D O I
10.1021/ma801598y
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Diblock copolymers having a random-coil polymer block (polystyrene, PS) connected to a side-group liquid crystal polymer (SGLCP) self-assemble in a nematic liquid crystal (LC), 4-pentyl-4'-cyanobiphenyl, into micelles with PS-rich cores and SGLCP-rich coronas. The morphologies of block copolymers with varying PS content are characterized as a function of temperature and concentration using small-angle neutron scattering, rheometry. and transmission electron microscopy. Unlike conventional solvents, the nematic LC can undergo a first-order transition between distinct fluid phases, accessing the regimes of both strong and slight selectivity in a single polymer/solvent pair. Micelles dissolve away above a microphase separation temperature (MST) that is often equal to the solution's isotropization point. T-NI. However. increasing or decreasing the polymer's PS content can shift the MST to be above or below T-NI. respectively. and in the former case, micelles abruptly swell with solvent at T-NI. Comparable effects can be achieved by modulating the overall polymer concentration.
引用
收藏
页码:299 / 307
页数:9
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