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An unsaturated polymer is a type of polymer that contains carbon-carbon double bonds within its structure. These double bonds make the polymer capable of undergoing further polymerization reactions. Unsaturated polyesters, for example, are produced by reacting saturated and unsaturated dicarboxylic acids with dialcohols. The resulting linear copolyesters contain these reactive double bonds, typically from maleic anhydride units. When dissolved in a monomer like styrene and initiated, these unsaturated polyesters copolymerize to form a hard, durable, three-dimensional network structure, commonly used in reinforced plastics like boat hulls and automotive parts.12

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