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Rheological study of the copolymerization reaction of acrylate‐terminated unsaturated copolyesters with styrene
Author(s) -
Zlatanic Alisa,
Dunjic Branko,
Djonlagic* Jasna
Publication year - 1999
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/(sici)1521-3935(19990901)200:9<2048::aid-macp2048>3.0.co;2-v
Subject(s) - copolymer , styrene , polymer chemistry , curing (chemistry) , double bond , materials science , acrylate , gel point , polymerization , dynamic mechanical analysis , rheology , peroxide , radical polymerization , chemistry , composite material , polymer , organic chemistry
The free radical copolymerization reaction of three series of acrylate‐terminated unsaturated polyesters with styrene, using benzoyl peroxide/ N , N ‐dimethylaniline as the redox initiator system, was followed by dynamic mechanical analysis. The presence of double bonds at both chain ends allows the formation of a regular network during the crosslinking copolymerization with styrene. The evolution of the rheological parameters, such as storage modulus G ′ and loss modulus G″, was recorded. The polymerization reaction, leading to the formation of a crosslinked structure, is described by a second order phenomenological equation, which takes into account a self‐acceleration effect, as a consequence of not only the chemical reaction of crosslinking after the gel point but also phase segregation. This rheokinetic model of curing acrylate‐terminated polyesters permits the determination of the numerical values of the kinetic equation constants and the degree of rheological conversion as a function of cure time. The influence of the terminal double bonds as well as of the cis‐trans configuration on the curing kinetics of the unsaturated copolyesters was evaluated.