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Cationic polymerization of bis(1‐alkylvinyl)benzene and related monomers, 7. Copolymers
Author(s) -
Maier Gerhard,
Nuyken Oskar,
Leitner Michael B.
Publication year - 1994
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.1994.021950526
Subject(s) - copolymer , cationic polymerization , monomer , polymer chemistry , benzene , glass transition , chemistry , molar mass , reactivity (psychology) , polymerization , alkyl , polymer , organic chemistry , medicine , alternative medicine , pathology
Polyindanes with long alkyl side chains have been prepared by reaction of 1,4‐bis(2‐hydroxy‐2‐propyl)benzene ( 3 ) and 1,4‐bis(2‐hexadecen‐2‐yl)benzene ( 4 ) in various ratios. All copolymers are soluble in common organic solvents and have been characterized by NMR, IR, GPC, DSC and TG. The variation of the glass transition temperature T g with the composition of the copolymers can be described satisfactorily by Couchman's equation, which describes the dependence of the T g 's of copolymers on the T g 's and heat capacities of the homopolymers and the weight fractions of the comonomers in the copolymers. A very important feature of this step‐growth copolymerization is the ability of all possible end‐groups of monomers and oligomers to react with each other. Therefore the composition of the copolymers is not governed by the composition of the feed, because there is no need for high conversion to obtain high molar mass. It was found that 3 was twice as reactive as 4 . The experimentally determined composition of the copolymers is in good agreement with the calculations based on the differences in the reactivity of the monomers.