Abstract
The thermoreversible gelation of solutions of syndiotactic poly(methyl methacrylate) in o-xylene was studied. The temperature domain of the sol-gel transition is independent of the overall tacticity and polymer concentration. The extent of gelation increases with increasing tacticity. A minimum degree of tacticity, corresponding to a minimum average sequence length, is needed. The combination of infra-red and calorimetric data with rheological observations reveals a two-step mechanism. Gelation is induced by a fast conformational change, followed by an intermolecular association.
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