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Conventional and RAFT miniemulsion copolymerizations of butyl methacrylate with fluoromethacrylate and monomer reactivity ratios
Author(s) -
Zhang Qinghua,
Wang Qiongyan,
Luo Zhenhuan,
Zhan Xiaoli,
Chen Fengqiu
Publication year - 2009
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.21419
Subject(s) - miniemulsion , copolymer , raft , polymer chemistry , chain transfer , monomer , reactivity (psychology) , azobisisobutyronitrile , materials science , polymerization , methacrylate , potassium persulfate , methyl methacrylate , transfer agent , reversible addition−fragmentation chain transfer polymerization , kinetics , chemistry , radical polymerization , organic chemistry , polymer , medicine , alternative medicine , physics , pathology , quantum mechanics
Reversible addition fragmentation chain transfer (RAFT) mediated and conventional miniemulsion copolymerizations of butyl methacrylate (BMA) with fluoromethacrylate (FMA) were carried out at 70°C with potassium persulphate as initiator. The kinetics of the copolymerizations was investigated comparatively. Copolymer compositions at low conversion levels were determined by 1 H NMR and FTIR spectra techniques. In the presence of RAFT agent 2‐cyanoprop‐2‐yl dithiobenzoate, the copolymerization of BMA with FMA in miniemulsion was obviously retarded. The copolymerization exhibited typical features of controlled molecular weights and narrow polydispersities. The reactivity ratios were evaluated by Kellen‐Tudos (K‐T) method, which yields the apparent reactivity ratios: r BMA = 0.73 and r FMA = 0.75 in conventional copolymerizations, and r BMA = 0.65 and r FMA = 0.70 in CPDB‐mediated system. The results show that the monomer FMA with a perfluoroalkyl side chain is slightly more reactive than BMA, and the copolymerizations process have a tendency to crosspropagate and to produce a higher FMA content in the copolymers. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers