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Production of hydroxyl‐terminated liquid natural rubber—mechanism of photochemical depolymerization and hydroxylation
Author(s) -
Ravindran T.,
Nayar M. R. Gopinathan,
Francis D. Joseph
Publication year - 1988
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.1988.070350509
Subject(s) - depolymerization , natural rubber , hydroxylation , photochemistry , chemistry , ultraviolet light , ultraviolet , reagent , reaction mechanism , organic chemistry , materials science , catalysis , enzyme , optoelectronics
Photochemical degradation of natural rubber yielded hydroxyl‐terminated liquid natural rubber (HTNR) when carried out in solution in presence of H 2 O 2 . Ultraviolet radiation from a medium pressure mercury vapor lamp and sunlight were found to be almost equally effective in bringing about the depolymerization and hydroxylation of natural rubber. The variations in the composition of the reagents and exposure time on the extent of depolymerization was conducted, and a suitable procedure for the large scale preparation of HTNR was described. A probable mechanism leading to the formation of HTNR as well as the side products is discussed based on the analytical data.