Abstract
A series of unsaturated polyesters based on phthalic anhydride (PHA), maleic anhydride (MA), ethylene glycol (EG), diethylene glycol (DG), triethylene glycol (TG), propylene glycol (PG), and styrene (Sty) were prepared. The molecular weights of the prepared polyesters were determined by the end group analysis. The crosslinking of unsaturated polyesters by copolymerization reaction between the double bonds from maleic anhydride and styrene has been studied. The effect of the structure of the resin on its curing behavior has been investigated. A marked delay in cure has been observed when EG was replaced or combined with other glycols. The maximum curing temperature, Young’s modulus and compressive strength were found to be related to the molecular weight of the glycol incorporated in these castings.
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