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Graft‐copolymerization of styrene on polypropylene in the solid phase
Author(s) -
Beenen Welmoed,
Wal Douwe J. v. D.,
Janssen Léon P.B. M.,
Buijtenhuijs Ab,
Hogt André H.
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961020131
Subject(s) - styrene , copolymer , polypropylene , polymer chemistry , materials science , polymerization , grafting , kinetics , monomer , swelling , polymer , diffusion , radical polymerization , chemical engineering , composite material , thermodynamics , physics , quantum mechanics , engineering
The graft‐copolymerization of styrene on PP in the solid phase has been studied under various reaction conditions using a radical initiator. Polymerization kinetics were investigated by DSC experiments and reactions in glass ampoules. The conversion rate and grafting efficiency of styrene appeared to be strongly influenced by the presence of the PP matrix and the styrene/PP ratio. From reactions in a lab scale reactor the concentrations of styrene and initiator, the dosing rate and the temperature were investigated to be critical parameters determining the grafting efficiency and the average length and number of grafts. The phenomena observed were explained by describing the process in relative rates of diffusion and polymerization, including swelling of the polymer by styrene monomer and diffusion limitations (Trommsdorff effect).