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POLYMERIZATION CONTROL IN CASTING OF METHYLMETHACRYLATE

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Field Value
 
Title POLYMERIZATION CONTROL IN CASTING OF METHYLMETHACRYLATE
 
Creator RAMASESHAN, V
TRIVEDI, MK
RAGHUNATHAN, TS
 
Subject polymerization
methylmethacrylate
bulk casting
gel effect
curing time temperature cycle
 
Description This paper reports a technique for the controlled bulk polymerisation of methylmethacrylate initiated by benzoyl peroxide. Due to the high exothermic nature of this polymerisation process, casting of thin sheets and profiles must generally be carried out at relatively low temperatures and over extended intervals of time at a constant rate. Curing profiles of 6-12 h have been considered incorporating the kinetic features of polymerisation which includes a gel effect. The influence of the gel effect on the propagation and termination rate constants can be divided into two regions: one up to 20% conversion, and the other beyond it. In the first range the gel effect is independent of conversion while in the latter stage its influence is characterised by Ross-Laurence parameters. The study indicates that no advantage is gained through the employment of two-stage initiator loading. Curing cycles of longer duration can be generated for thicker castings from the analysis given.
 
Publisher JOHN WILEY & SONS LTD
 
Date 2011-08-17T00:18:25Z
2011-12-26T12:55:13Z
2011-12-27T05:43:56Z
2011-08-17T00:18:25Z
2011-12-26T12:55:13Z
2011-12-27T05:43:56Z
1993
 
Type Article
 
Identifier POLYMER INTERNATIONAL, 32(3), 275-281
0959-8103
http://dx.doi.org/10.1002/pi.4990320310
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9676
http://hdl.handle.net/10054/9676
 
Language en