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Manufacture of ultra high modulus polymer fibres: the polymerization step

DSpace at IIT Bombay

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Field Value
 
Title Manufacture of ultra high modulus polymer fibres: the polymerization step
 
Creator KHAKHAR, DV
 
Subject diffusion-limited polymerization
rigid rodlike molecules
brownian dynamics simulation
rod-like molecules
shear-flow
enhancement
kinetics
 
Description Polymers with a rodlike conformation can be spun into ultra high strength fibres which find applications in the manufacture of light weight composites, cables and ropes, and protective clothing, among others. The polymerization of such rodlike molecules, which are made by solution polycondensation, is qualitatively different from flexible molecules. For rodlike polymers, nearly parallel orientation of the reacting pair of is a necessary condition for reaction, and this results in slowing of the reaction due to very slow rotational diffusion of the molecules. Flow can easily orient rodlike molecules due to their anisotropic shape and low rotational diffusivity, and thus has an impact on polymerization kinetics. The role of polymer dynamics on the polymerization kinetics of rodlike molecules is reviewed, as is the effect of dynamics on the molecular weight and the molecular weight distribution of the product. The implications for practical applications are discussed.
 
Publisher NATL INST SCIENCE COMMUNICATION-NISCAIR
 
Date 2011-10-14T00:08:01Z
2011-12-15T09:16:17Z
2011-10-14T00:08:01Z
2011-12-15T09:16:17Z
1998
 
Type Review
 
Identifier JOURNAL OF SCIENTIFIC & INDUSTRIAL RESEARCH,57(8)429-440
0022-4456
http://dspace.library.iitb.ac.in/xmlui/handle/10054/13889
http://hdl.handle.net/100/3087
 
Language en