Kinetics of photopolymerization-induced phase separation and morphology development in mixtures of a nematic liquid crystal and multifunctional acrylate

被引：49

作者：

Duran, Hatice ^{[1
]}

Meng, Scott ^{[1
]}

Kim, Namil ^{[1
]}

Hu, Jun ^{[2
]}

Kyu, Thein ^{[1
]}

Natarajan, Lagudi V. ^{[3
]}

Tondiglia, Vincent P. ^{[3
]}

Bunning, Timothy J. ^{[4
]}

机构：

[1] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA

[2] Univ Akron, Dept Chem, Akron, OH 44325 USA

[3] Sci Applicat Int Corp, Dayton, OH 45431 USA

[4] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

来源：

POLYMER | 2008年 / 49卷 / 02期

基金：

美国国家科学基金会;

关键词：

photopolymerization-induced phase separation; photoreaction kinetics; real-time morphology development;

D O I：

10.1016/j.polymer.2007.11.039

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Photopolymerization behavior and reaction kinetics for a series of multifunctional acrylate monomer(s) and eutectic liquid crystal blends were investigated with particular emphasis on determination of the reaction rate coefficients for propagation and termination steps of photopolymerization. Reaction rate coefficients were determined via real-time infrared spectroscopy and compared with those obtained by photo-differential scanning calorimetry. Effects of various parameters such as LC concentration, light intensity, and monomer functionality on the kinetics were investigated. Phase transition temperature versus composition phase diagrams were established by means of optical microscopy and differential scanning calorimetry for mixtures of triacrylate/liquid crystal (LC) before photopolymerization and after exposing to ultra violet (UV) irradiation under various reaction times. The snapshot phase diagram of the reacting mixtures exhibited isotropic gel, isotropic liquid + nematic. and narrow pure nematic coexistence re ions. These coexistence regions were further confirmed by morphological changes of the polymer dispersed liquid crystal films as functions of temperature and concentration using polarized optical microscopy. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：534 / 545

页数：12

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