Time-resolved light scattering of the phase separation in polymer-dispersed liquid crystals formed by photo-polymerization induced phase separation

被引：16
作者：
Crawford, N. J.
Dadmun, M. D.
Bunning, T. J.
Natarajan, L. V.
机构：
[1] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA
[2] USAF, Res Labs, Mat Res Directorate, Wright Patterson AFB, OH 45433 USA
来源：
POLYMER | 2006年 / 47卷 / 18期
关键词：
time-resolved light scattering; polymer-dispersed liquid crystals; phase separation;
D O I：
10.1016/j.polymer.2006.06.058
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Time-resolved light scattering is utilized to monitor the phase separation of photo-initiated polymer-dispersed liquid crystals. At the lowest cure intensities studied, the system undergoes spinodal decomposition and the results are analyzed with Cahn-Hilliard theory. As the cure intensity increases, the rate of phase separation increases such that the early stages of spinodal decomposition are no longer observable. These systems are analyzed using the Debye-Bueche model, which provides the time evolution of the number and size of LC domains. These results indicate that an increase in cure beam intensity initially increases the rate of domain growth, but this effect is overwhelmed by the fast vitrification and cross-linking that can occur at highest cure beam intensities. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：6311 / 6321
页数：11
相关论文
共 39 条
[1]   PHASE-BEHAVIOR OF POLYMER LIQUID-CRYSTAL BLENDS [J].
AHN, W ;
KIM, CY ;
KIM, H ;
KIM, SC .
MACROMOLECULES, 1992, 25 (19) :5002-5007
[2]   Phase separation by continuous quenching:: Similarities between cooling experiments in polymer blends and reaction-induced phase separation in modified thermosets [J].
Alig, I ;
Rüllmann, M ;
Holst, M ;
Xu, JJ .
MACROMOLECULAR SYMPOSIA, 2003, 198 :245-257
[3]  
[Anonymous], 1997, Handbook of Liquid Crystal Research
[4]  
BALLAUFF M, 1986, MOL CRYST LIQ CRYST, V4, P15
[5]   Effect of molecular weight on the phase diagram and thermal properties of poly(styrene)/8CB mixtures [J].
Benmouna, F ;
Daoudi, A ;
Roussel, F ;
Leclercq, L ;
Buisine, JM ;
Coqueret, X ;
Benmouna, M ;
Ewen, B ;
Maschke, U .
MACROMOLECULES, 2000, 33 (03) :960-967
[6]  
Benmouna F, 2000, MACROMOL THEOR SIMUL, V9, P215, DOI 10.1002/1521-3919(20000601)9:5<215::AID-MATS215>3.3.CO
[7]  
2-I
[8]   Polymerization-induced phase separation .1. Conversion-phase diagrams [J].
Boots, HMJ ;
Kloosterboer, JG ;
Serbutoviez, C ;
Touwslager, FJ .
MACROMOLECULES, 1996, 29 (24) :7683-7689
[9]  
Brown W., 1996, Light Scattering: Principles and Development
[10]   Holographic polymer-dispersed liquid crystals (H-PDLCs) [J].
Bunning, TJ ;
Natarajan, LV ;
Tondiglia, VP ;
Sutherland, RL .
ANNUAL REVIEW OF MATERIALS SCIENCE, 2000, 30 :83-115
1234