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Acrylic anhydride has been polymerized in solution to afford a series of saturated, linear polymers. Values of molecular weight from a few thousand up to 95,000 were recorded for the various products. The properties of the polymers showed that polymerization had occurred by the alternating intramolecular-intermolecular mechanism, in this case leading to a poly-3(5)-methyleneglutaric anhydride structure.The polyacrylic acid obtained by hydrolysis of a polyacrylic anhydride has been shown to have a much more regular structure than normal polyacrylic acid, as reflected in their relative degrees of crystallinity.Certain monomers containing a 1,6-diene system can, on polymerization, undergo an alternating intramolecular-intermolecular chain propagation or cyclization, leading to the formation of saturated, linear polymers.8-6 Such polymers have a structure consisting of a linear chain of six-membered rings alternating with methylene groups along the chain. In the first paper of this series,6 the proof of the structure in the case of the poly-(diallylammonium halides) ivas given.

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