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Dichlorocarbene modification of styrene–butadiene rubber

✍ Scribed by M. T. Ramesan; Rosamma Alex

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
194 KB
Volume
68
Category
Article
ISSN
0021-8995

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✦ Synopsis

Dichlorocarbene-modified styrene-butadiene rubber (SBR) prepared by the alkaline hydrolysis of chloroform using cetyltrimethylammonium bromide as a phase-transfer agent resulted in a product that showed good mechanical properties, excellent flame resistance, solvent resistance, and good thermal stability. The activation energy for this chemical reaction calculated from the time-temperature data on the chemical reaction by the measurement of the percentage of chlorine indicated that the reaction proceeded according to first-order kinetics. The molecular weight of the polymers, determined by gel permeation chromatography, showed that chemical modification was accompanied by an increase in molecular weight. The chemical modification was characterized by proton NMR, FTIR studies, thermogravimetric analysis, and flammability measurement. Proton NMR and FTIR studies revealed the attachment of chlorine through cyclopropyl rings to the double bond of butadiene.

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