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Effects of post‐curing of unsaturated polyester resins in various media
Author(s) -
Chen ShowAn,
Tsai PaiKuen
Publication year - 1977
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760171103
Subject(s) - hexane , curing (chemistry) , materials science , monomer , polymer chemistry , radical , styrene , polymerization , copolymer , dimethyl sulfoxide , polyester , nitrogen , organic chemistry , chemistry , polymer , composite material
Experimental studies were performed on the effects of postcuring of' styrenated, unsaturated polyesters in nitrogen gas, water or its vapor, hexane vapor, dimethyl sulfoxide (DMSO), and dirnethyl formamide (DMF) all at 100°C It was found that, nitrogen gas and water are inactive, hexane acts as a chain transfer agent, and DMF and DMSO behave as solvents which extract residual styrene monomer and anhydrides from the resins. Post‐treatment in inert media can result in further reaction leading to more complete cure as free radicals and residual monomer continue to react. The post‐curing reaction is a radical copolymerization. Further condepgation polymerisation does not occur. Post‐curing in, hexane vapor1eads to a transfer of the active sites from the radicals to the hexane and to no further radical polymerization.