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Greffages mecanochimiques sur le polychlorure de vinyle. II. Éatude des copolymègres grefféas
Author(s) -
Michel Alain,
Galin Monique,
Guyot Alain
Publication year - 1969
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.1969.070130510
Subject(s) - copolymer , monomer , polymer chemistry , methyl methacrylate , styrene , materials science , polymerization , vinyl chloride , methacrylate , radical , chemistry , polymer , composite material , organic chemistry
The copolymers obtained by mastication of poly(vinyl chloride) (PVC) in presence of methyl methacrylate and styrene monomers, and their fractions, were studied by using infrared spectroscopy, NMR, and flash pyrolysis. The degree of alternation between vinyl chloride and methyl methacrylate or styrene units is very low, and the copolymers are heterogeneous in composition. The results suggest that the mastication medium involves three kinds of domains: the inner part of the elementary grains of PVC is very slightly penetrated by the monomers. The polymerization initiated by the polymeric free radicals created by the rupture of bonds, begins in the surface layers of the grains and cause the formation of a true copolymer which accounts for 5–10% of the material. Light radicals arising from transfer reaction migrate into the third external domain which consists practically entirely of pure monomers and initiate polymerization.