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Reaction Behavior and Network Development in RAFT Radical Polymerization of Dimethacrylates
Author(s) -
Yu Qiang,
Zhu Yongshu,
Ding Yonghong,
Zhu Shiping
Publication year - 2008
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700464
Subject(s) - raft , chain transfer , polymerization , reversible addition−fragmentation chain transfer polymerization , radical polymerization , polymer chemistry , fragmentation (computing) , living polymerization , polymer , materials science , chemistry , composite material , computer science , operating system
Abstract The reaction behavior and development of network microstructure in the RAFT polymerization of OEGDMA were investigated. The polymerization rate of the RAFT system was much lower than in conventional FRP, largely due to the low propagating‐radical concentration determined by the addition‐fragmentation equilibrium. A mild autoacceleration occurred as the addition reaction became diffusion‐controlled. The slow chain growth in the RAFT allowed sufficient chain relaxation and a uniform distribution of reacting species. The RAFT polymerization of OEGDMA with longer spacers yielded more homogeneous networks with a lower crosslinking density and lower glass transition temperature than the FRP.