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Impregnation and polymerization of vinylic monomers in porous media. II. Polymerization in situ
Author(s) -
Godard P.,
Mercier J. P.
Publication year - 1974
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.1974.070180518
Subject(s) - polymerization , polymer chemistry , radical polymerization , bulk polymerization , precipitation polymerization , monomer , kinetic chain length , methyl methacrylate , chain growth polymerization , materials science , chemistry , chemical engineering , polymer , composite material , engineering
Abstract In this work, we have studied the kinetics of polymerization of styrene and of methyl methacrylate in a porous asbestos cement medium initiated by the thermal decomposition of a radical initiator. Our results show that the presence of the porous medium appreciably modifies the rate of polymerization. Two factors have been proposed to explain this effect: a variation of the constant of decomposition of the initiator resulting from the alkalinity of the surface, and a modification of the rate constant of chain propagation related to the electron‐releasing or attracting capacity of the double bond of the monomer. Nevertheless, the polymerization remains solely initiated by radicals resulting of the thermal decomposition of the initiator as the rate varies according to the square root of the initiator concentration and tends toward zero for polymerization containing no peroxide.