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For example, once polyesters form, they cannot readily be purified, and, for purely practical reasons, it is often difficult to attempt toincrease the molecular weight of a polyester once it hasbeen removed from the reaction vessel. It is thereforenecessary to aim at conditions most likely to yield productsof the required molecular weight with minimumrisk of decomposition or side reactions that could complicatethe structure of the products or induce the formationof constituents that might hinder the course ofpolymerization.
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