Isothermal frontal polymerization: Confirmation of the isothermal nature of the process and the effect of oxygen and polymer seed molecular weight on front propagation

被引:21
作者
Evstratova, Svetlana I.
Antrim, Daniel
Fillingane, Chip
Pojman, John A. [1 ]
机构
[1] Univ So Mississippi, Dept Chem & Biochem, Hattiesburg, MS 39406 USA
[2] Rostov State Pedag Univ, Rostov Na Donu, Russia
关键词
isothermal frontal polymerization; laser line deflection (Weiner's method); radical polymerization;
D O I
10.1002/pola.21447
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Isothermal frontal polymerization is a directional polymerization that utilizes the Norish-Trommsdorff (gel) effect to produce optical gradient materials. When a solution of methyl methacrylate and thermal initiator contacts a polymer seed (a small piece of poly(methyl methacrylate), a viscous region is formed in which the polymerization rate is faster than in the bulk solution. We obtained definitive evidence of the isothermal nature of the process by placing thermocouples above the propagating front. Using the optical technique of laser line deflection (Weiner's method), we studied the front propagation to determine the induction period, and the maximum distance propagated as a function of the molecular weight of the seed. We determined that the polymer seed must have a minimum molecular weight to initiate a front. We also determined that oxygen would act as a bulk polymerization inhibitor and increase the front propagation distance, but after purging the monomer-initiator solution with oxygen for several hours, the distance was shortened. We ascribed this behavior to the formation of peroxy radicals from the slow decomposition of the initiator and subsequent reaction with oxygen. (c) 2006 Wiley Periodicals, Inc.
引用
收藏
页码:3601 / 3608
页数:8
相关论文
共 56 条
[21]  
Ivanov VV, 1997, CHEM PHYS REP+, V16, P947
[22]  
Ivanov VV, 2001, POLYM INT, V50, P113, DOI 10.1002/1097-0126(200101)50:1<113::AID-PI594>3.0.CO
[23]  
2-X
[24]  
Khan AM, 1996, TRENDS POLYM SCI, V4, P253
[25]   GRADED-INDEX PLASTIC OPTICAL FIBER COMPOSED OF METHYL-METHACRYLATE AND VINYL PHENYLACETATE COPOLYMERS [J].
KOIKE, Y ;
NIHEI, E ;
TANIO, N ;
OHTSUKA, Y .
APPLIED OPTICS, 1990, 29 (18) :2686-2691
[26]   NEW INTERFACIAL-GEL COPOLYMERIZATION TECHNIQUE FOR STERIC GRIN POLYMER OPTICAL WAVE-GUIDES AND LENS ARRAYS [J].
KOIKE, Y ;
TAKEZAWA, Y ;
OHTSUKA, Y .
APPLIED OPTICS, 1988, 27 (03) :486-491
[27]  
Koike Y., 1992, POLYM LIGHTWAVE INTE, P71
[28]   THE SIMULTANEOUS PROCESS OF FILAMENT WINDING AND CURING FOR POLYMER COMPOSITES [J].
KOROTKOV, VN ;
CHEKANOV, YA ;
ROZENBERG, BA .
COMPOSITES SCIENCE AND TECHNOLOGY, 1993, 47 (04) :383-388
[29]  
LAJEUNESSE E, 1999, DEPLACEMENT INSTABIL
[30]   Synthesis and photopolymerization of novel multifunctional vinyl esters [J].
Lee, TY ;
Kaung, W ;
Jönsson, ES ;
Lowery, K ;
Guymon, CA ;
Hoyle, CE .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 2004, 42 (17) :4424-4436