Premium
Several features of vinyl chloride–diallyl phthalate suspension copolymerization
Author(s) -
Bao YongZhong,
Weng ZhiXue,
Huang ZhiMing,
Pan ZuRen
Publication year - 2000
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/(sici)1097-4628(20000705)77:1<156::aid-app21>3.0.co;2-o
Subject(s) - copolymer , vinyl chloride , dispersity , polymer chemistry , phthalate , polymerization , suspension polymerization , reactivity (psychology) , autoclave , materials science , suspension (topology) , chemistry , nuclear chemistry , polymer , organic chemistry , composite material , mathematics , pathology , homotopy , pure mathematics , medicine , alternative medicine
Vinyl chloride–diallyl phthalate (VC–DAP) suspension copolymerization was carried out in a 5‐L autoclave and 200‐mL stainless steel vessel at 45°C. The apparent reactivity ratios of VC–DAP suspension copolymerization system were calculated as r VC = 0.77 and r DAP = 0.37. It shows that VC–DAP copolymer contains no gel when the feed concentration of DAP ( f 0 2 ) is lower than a critical concentration ( f cr , inside the range of 0.466–0.493 mmol/mol VC at 80–85% conversion), the polymerization degree (DP) of copolymer increases with the increase of f 0 2and conversion. VC–DAP copolymer is composed of gel and sol fractions when f 0 2is larger than f cr . The DP of sol fraction decreases as f 0 2increases, but the gel content and the crosslinking density of gel increase. The gel content also increases as conversion increases. The results also show that the index of polydispersity of molecular weight of sol changes with f 0 2 , a maximum value appears when f 0 2is close to f cr . © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 156–162, 2000