Abstract
This article describes the solvolysis of sheet-molding composites (SMC) consisting of an unsaturated polyester−styrene (UP) thermoset resin associated with glass fibers, filler (calcium carbonate), and a low-profile additive (LPA) (thermoplastic poly(vinyl acetate)). Preliminary studies have shown that glycols, diacids, and bisphenols are poor solvolytic reagents. On the contrary amino alcohols and polyamines allow much higher depolymerization yields, leading to a total digestion of the polymers. Diethylenetriamine (DETA), at boiling temperature (205 °C) was then chosen as solvolytic reagent. Pure poly(vinyl acetate) (PVAc) is readily converted to soluble products. A total dissolution of cured UP requires high yield of ester cleavage. Longer reaction times are needed with styrene content enhancing. The introduction of PVAc in the UP resin does not alter the kinetics of solvolysis of the thermoset but affects the rheological behavior in intermediate states and enhances the viscosity of the final liquid. A ...
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