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The monoester of itaconic acid with n‐decyl alcohol was prepared and polymerized. The polymer was fractionated and characterized by viscometry, size‐exclusion chromatography (SEC) and light scattering. Some of the common semiempirical relations for flexible and rigid polymers were used in order to obtain the unperturbed dimensions and the conformational parameters. Thermodynamic and dimensional parameters were determined and calculated. The results are compared with those reported previously for similar compounds.

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The unperturbed dimensions and the steric factor CT of poly(mono-n-octyl itaconate) (poly-(1 -carboxy-1 -octyloxycarbonylmethylethylene)) were determined from the intrinsic viscosities in two solvents, using the semiempirical equation of Stockmayer and Fixman. Evidence for the existence of specific effects was found. The irregular behaviour observed, can be interpreted in terms of conformational changes and conformational transitions of the polymeric chain, induced both by solvent and temperature. The effect of the structure of the monomeric unit on the flexibility of the macromolecule is discussed. 0025-1 16X/85/$03.00 *) 6,5 and 5,9 correspond to C&=C< .