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Free-radical trapping in the precipitation polymerization of acrylamide

DSpace at IIT Bombay

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Title Free-radical trapping in the precipitation polymerization of acrylamide
 
Creator GUHA, S
RAO, TRG
MANDAL, BM
 
Subject dispersion polymerization
water-soluble polymers
esr/epr
radical polymerization
precipitation polymerization
polyacrylamide
 
Description Electron spin resonance spectroscopy revealed that some free radicals were trapped in the precipitated polymer during the precipitation polymerization of acrylamide conducted in nonsolvents of the polymer [t-butyl alcohol (TBA), acetone and methanol]. The trapped radical concentration decreased with an increase in the chain-transfer activity of the aforementioned liquids. A 100% polymerized acrylamide in TBA prepared with a 10% monomer concentration and a 3 X 10(-3) mol/dm(3) azobisisobutyronitrile concentration at 50 degreesC contained approximately 2 radicals per 100 polymer molecules. The trapped radicals on exposure to air decayed with time according to second-order kinetics. The rate constant was evaluated and found to be in reasonably good agreement with the rate constant evaluated from data published long ago for the decay of trapped polyacrylonitrile radicals following their exposure to air. (C) 2003 .
 
Publisher JOHN WILEY & SONS INC
 
Date 2011-08-16T05:45:27Z
2011-12-26T12:54:47Z
2011-12-27T05:43:03Z
2011-08-16T05:45:27Z
2011-12-26T12:54:47Z
2011-12-27T05:43:03Z
2003
 
Type Article
 
Identifier JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 41(11), 1192-1197
0887-6266
http://dx.doi.org/10.1002/polb.10476
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9403
http://hdl.handle.net/10054/9403
 
Language en