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Epoxidation of natural rubber latices: Methods of preparation and properties of modified rubbers
Author(s) -
Burfield David R.,
Lim KooiLing,
Law KiaSang
Publication year - 1984
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/app.1984.070290520
Subject(s) - peracetic acid , natural rubber , reagent , swelling , solvent , polymer chemistry , chemical modification , hydrogen peroxide , materials science , elastomer , chemistry , polymer , organic chemistry , composite material
Studies in the epoxidation of natural rubber latices are described. Investigated epoxidation routes include the use of bromohydrin intermediates, hydrogen‐peroxide‐catalyzed systems, and preformed peracetic acid. The latter reagent allows almost quantitative epoxidation of natural rubber up to high modification levels with no detectable side reactions. Kinetic studies show that the peracetic acid epoxidation is second order in peracid and rubber hydrocarbon with an overall activation energy of 56.2 kJ/mol. Epoxidation leads to a progressive increase in T g and polymer density with increase in modification level. The effect of modification on solvent swelling and mechanical properties of the DICUP‐crosslinked rubbers are reported.