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Kinetics and thermal analysis of copolymerization of m ‐isopropenyl–α,α′‐dimethylbenzyl isocyanate with styrene
Author(s) -
Wu HoShing,
Chuang MingHui,
Hwang JiannWen
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990923)73:13<2763::aid-app25>3.0.co;2-3
Subject(s) - copolymer , polymer chemistry , activation energy , reactivity (psychology) , styrene , isocyanate , differential scanning calorimetry , gel permeation chromatography , thermogravimetric analysis , kinetics , chemistry , intrinsic viscosity , materials science , polyurethane , polymer , organic chemistry , thermodynamics , physics , quantum mechanics , medicine , alternative medicine , pathology
The copolymerizations of m ‐isopropenyl–α,α′‐dimethylbenzyl isocyanate ( m ‐TMI) with styrene (STY) was investigated. The weight conversion of the copolymerization reaction increased as the duration of copolymerization increased. The reaction temperature was maintained between 60 and 75°C. Molecular weights of the copolymers decreased with increasing molar fraction of m ‐TMI in the feed. This study obtained reactivity ratios, Alfrey–Price parameters, Mark–Houwink constant, characteristic ratio, thermal degradation activation energy, difference of reactive propagation activation energy, and intrinsic viscosity for the copolymers. The copolymers were characterized by using elemental analysis (EA), gel permeation chromatography, thermogravimetric analysis, and differential scanning calorimetry. The copolymer chains in solution were observed to have a high degree of stiffness and a lack of rotational freedom. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2763–2770, 1999