TY - JOUR
T1 - Alternating copolymers of hexafluoroisobutylene with vinyl trifluoroacetate and vinyl pentafluorobenzoate
AU - Mikes, Frantisek
AU - Teng, Hongxiang
AU - Koike, Yasuhiro
AU - Okamoto, Yoshiyuki
PY - 2012/11/15
Y1 - 2012/11/15
N2 - Copolymerizations of hexafluoroisobutylene (HFIB) with vinyl pentafluorobenzoate (VPFB) and vinyl trifluoroacetate (VTFA) were carried out in bulk using perfluorodibenzoyl peroxide as the radical initiator. The copolymers obtained were characterized by proton and fluorine NMR spectroscopy. The monomer reactivity ratios in the polymerization of HFIB with VPFB were r 1 (HFIB) = 0, r 2 (VPFB) = 0.373, and r 1r 2 = 0. The results indicated that these copolymers have alternating structures. Similarly, the copolymers of HFIB and VTFA also showed alternating structures. The films of HFIB-co-VPFB were prepared by casting THF solution of polymers. Films obtained were flexible and transparent. The refractive indices of copolymers were 1.4549, 1.4490, and 1.4438 at 532, 633, and 839 nm, respectively. The average T gs of HFIB-co-VTFA and HFIB-co-VPFB were 52 and 71 °C, respectively. From these results, the T g of the hypothetical HFIB homopolymer is postulated to be in between 70 and 90 °C, which may be useful in the assessment of T gs of HFIB copolymers with other vinyl monomers.
AB - Copolymerizations of hexafluoroisobutylene (HFIB) with vinyl pentafluorobenzoate (VPFB) and vinyl trifluoroacetate (VTFA) were carried out in bulk using perfluorodibenzoyl peroxide as the radical initiator. The copolymers obtained were characterized by proton and fluorine NMR spectroscopy. The monomer reactivity ratios in the polymerization of HFIB with VPFB were r 1 (HFIB) = 0, r 2 (VPFB) = 0.373, and r 1r 2 = 0. The results indicated that these copolymers have alternating structures. Similarly, the copolymers of HFIB and VTFA also showed alternating structures. The films of HFIB-co-VPFB were prepared by casting THF solution of polymers. Films obtained were flexible and transparent. The refractive indices of copolymers were 1.4549, 1.4490, and 1.4438 at 532, 633, and 839 nm, respectively. The average T gs of HFIB-co-VTFA and HFIB-co-VPFB were 52 and 71 °C, respectively. From these results, the T g of the hypothetical HFIB homopolymer is postulated to be in between 70 and 90 °C, which may be useful in the assessment of T gs of HFIB copolymers with other vinyl monomers.
KW - alternating copolymer
KW - copolymerization
KW - fluoropolymers
KW - monomer reactivity
KW - synthesis
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U2 - 10.1002/pola.26290
DO - 10.1002/pola.26290
M3 - Article
AN - SCOPUS:84867550058
VL - 50
SP - 4717
EP - 4720
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
SN - 0887-624X
IS - 22
ER -