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Influence of initiator on the curing of unsaturated polyester resin at 100 °C
Author(s) -
Delaite Christelle,
Bistac Sophie,
Dreyer Elodie,
Schuller AnneSophie
Publication year - 2020
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5934
Subject(s) - sheet moulding compound , curing (chemistry) , materials science , composite material , isothermal process , polyester , rheology , molding (decorative) , unsaturated polyester , benzoyl peroxide , kinetics , polymer , polymer chemistry , polymerization , physics , quantum mechanics , thermodynamics
Sheet molding compound (SMC) parts are fiber‐reinforced unsaturated polyester (UP) composites molded at 140–170 °C under a pressure of 60–100 bar. For economic and ecological reasons, the aim of this research project is to develop new SMC formulations to modify the molding conditions. For this, SMC formulations were modified and optimized to decrease the molding temperature to 100 °C. The strategy was to change the catalytic system (peroxides) in order to obtain highly reactive formulations at 100 °C. First, the temperatures of initiation of the reaction were determined by rheological and DSC measurements for each peroxide. Second, the UP resin crosslinking kinetics were measured for the various peroxides during an isothermal curing at 100 °C. The results obtained with the three experimental methods are compared and discussed. Finally, the laboratory analyses were validated by SMC molding trials. © 2019 Society of Chemical Industry