Nouvelles resines vinylesters sans styrene: 1. Synthese et etude de la structure des reseaux

SMC (sheet molding compound) is a composite based on fibers‐reinforced unsaturated polyester (UP) resin molded usually at 140°C to 170°C under a pressure of 60 to 100 bars. In order to develop new SMC formulations that can be molded at lower temperature (100°C) for economic and environmental reasons, the formulation of the composite had to be completely modified, both to allow a rapid reaction at 100°C, but also to avoid a vitrification phenomenon due to the fact that the glass transition temperature (Tg) of the SMC parts becomes, during the molding process, higher than the mold temperature. In this paper, the relation between the molding temperature, the glass transition temperature, and the final conversion of UP resin/styrene formulations has been underlined. The Tg of the cured resin was decreased by two different ways. The first way involved the reduction of the crosslinking density of the UP resin by using a blend of two resins, a pure maleic and a more flexible one. This blend allows to adjust the Tg over a temperature range from 197°C (Tg of the pure UP resin) to 75°C (Tg of the pure flexible resin). The second way consisted in the addition of butyl methacrylate (BuMA), a reactive plasticizer, to the formulation, allowing a decrease of the final material's Tg from 197°C to 130°C by replacing 35 wt% of styrene by BuMA. These two methods allow to obtain a final conversion of 99% after 8 minutes of molding at 100°C.

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Influence of glass transition temperature of crosslinked unsaturated polyester resin/styrene formulations on the final conversion after an isothermal curing at 100°C

Delaite

Bistac

Dreyer

et al. 2020

Polymers for Advanced Techs

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Nouvelles re ́sines vinylesters sans styre ̀ne—2. proprie ́te ́s me ́caniques et thermiques et comportement au vieillissement hydrothermique

Becart

Mariette

Hoarau

et al. 1998

European Polymer Journal

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Nouvelles resines vinylesters sans styrene: 1. Synthese et etude de la structure des reseaux

Cited by 2 publications

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Influence of glass transition temperature of crosslinked unsaturated polyester resin/styrene formulations on the final conversion after an isothermal curing at 100°C

Influence of glass transition temperature of crosslinked unsaturated polyester resin/styrene formulations on the final conversion after an isothermal curing at 100°C

Nouvelles re ́sines vinylesters sans styre ̀ne—2. proprie ́te ́s me ́caniques et thermiques et comportement au vieillissement hydrothermique

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