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Study on kinetic of natural rubber vulcanization by using vulcameter
Author(s) -
Wang Pingyue,
Qian Honglian,
Yu Heping,
Chen Jin
Publication year - 2003
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.11632
Subject(s) - vulcanization , arrhenius equation , activation energy , kinetic energy , thermodynamics , frequency factor , reaction rate constant , natural rubber , chemistry , materials science , physics , kinetics , composite material , classical mechanics
The velocity of vulcameter torque change during the vulcanization of natural rubber consists of two increasing and decreasing stages. The vulcanization process in the stage of velocity increasing is not a simple reaction, and can be expressed in an equation of ln( M H − M t ) = ln A − K 1 ( t − t 0 ) α , which is different from the famous equation of V ut = − ( aK 3 / K 4 )ln[( K 2 e K 1 t − K 1 e K 2 t )/( K 2 − K 1 )] deduced by Coran, the value of K 1 1/α in the former can be used as a rate constant to calculate the value of activation energy ( E 1 ) according to the Arrhenius equation. The vulcanization process in the stage of velocity decreasing consists of two first‐order reactions, and can be expressed in a kinetic equation of ln( M H − M t ) = ln B − K ( t − t dis ). The time ( t p ) at which the torque change reaches to the maximum velocity ( V m ) is corresponding to the time ( t dis ) suggested by Coran. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 680–684, 2003