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Investigation of the Physical Properties of Poly(ortho‐ and para‐trifluoromethoxy styrenes)
Author(s) -
Sengupta Arijit,
Koike Yasuhiro,
Okamoto Yoshiyuki
Publication year - 2013
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.201300270
Subject(s) - polymer chemistry , polystyrene , bromobenzene , benzoyl peroxide , glass transition , steric effects , chemistry , styrene , ether , polymer , polymerization , materials science , organic chemistry , catalysis , copolymer
Ortho and para ‐OCF 3 substituted styrenes are prepared by the Grignard cross‐coupling reaction between ‐OCF 3 substituted bromobenzene and vinyl bromide and further polymerized in bulk using benzoyl peroxide. The glass‐transition temperatures ( T g ) are 80 °C and 73 °C for the ortho and para –OCF 3 substituted polystyrenes, respectively, which are much lower compared with polystyrene (100 °C). The size of the ‐OCF 3 group is large and the ether bond is flexible; thus, the ‐OCF 3 substituted polystyrenes have larger free volumes, which has more effect on the T g value compared with that of the steric hindrance effect. The refractive indices are 1.4908 and 1.4809 at 650 nm for ortho and para –OCF 3 substituted polystyrenes, respectively, which are much lower than that of polystyrene (1.5861) due to the presence of fluorine atoms in the polymer unit.