Abstract
AbstractRelationships between intrinsic viscosity and weight‐average molecular weight were obtained for fractions of polyvinyl methyl ether and, approximately, for samples of homologous polymers having ethyl, isopropyl, and n‐butyl alkyl groups in the side‐chain.Within the range of molecular weights between 1 · 104 and 5 · 105, the equation [η] = 1.37 · 10−3 M0.54 holds for fractions of polyvinyl methyl ether dissolved in butanone at 30°C. For molecular weights between about 5 · 104 and 5 · 105, the equation [η] = 9.2 · 10−4 M0.58 gives a better fit. For solutions in benzene, the overall equation [η] = 7.6 · 10−6 M0.60 is valid.At least for high molecular weights (1 · 105 < M < 1 · 106), the equation [η] = 1.37 · 10−3 M0.54 also represents the data well for solutions of unfractionated samples of polyvinyl ethyl ether and polyvinyl isopropyl ether. On the other hand, data for two samples of polyvinyl n‐butyl ether do not fit this equation.The degree of steric hindrance was found to depend on the size or bulkiness of the alkyl side chain, and decreased in the following order: equation image
Published Version
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