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Preparation of poly(styrene‐ co ‐isobornyl methacrylate) beads having controlled glass transition temperature by suspension polymerization
Author(s) -
Zhang Bing,
Ma Yuhong,
Chen Dong,
Xu Jingnan,
Yang Wantai
Publication year - 2012
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.38710
Subject(s) - copolymer , monomer , polymer chemistry , styrene , polymerization , glass transition , suspension polymerization , methacrylate , materials science , chemistry , polymer , composite material
The styrene (St) and isobornyl methacrylate (IBMA) random copolymer beads with controlled glass transition temperature ( T g ), in the range of 105–158°C, were successfully prepared by suspension polymerization. The influence of the ratios of IBMA in monomer feeds on the copolymerization yields, the molecular weights and molecular weight distributions of the produced copolymers, the copolymer compositions and the T g s of these copolymers was investigated systematically. The monomer reactivity ratios were r 1 (St) = 0.57 and r 2 (IBMA) = 0.20 with benzyl peroxide as initiator at 90°C, respectively. As the mass fraction of IBMA in monomer feeds was about 40 wt %, it was observed that the monomer conversion could be up to 90 wt %. The fractions of IBMA unit in copolymers were in the range of 35–40 wt % and T g s of the corresponding copolymers were in the range of 119.6–128°C while the monomer conversion increased from 0 to greater than 90 wt %. In addition, the effects of other factors, such as the dispersants, polymerization time and the initiator concentration on the copolymerization were also discussed. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013