Abstract
THE physical properties of a substance consisting of long-chain molecules are modified considerably if branches are introduced into the molecules, and a method for estimating the number and length of the branches in a synthetic addition polymer would be of very great value. That some types of vinyl polymers are, in fact, branched has been demonstrated in this laboratory by an examination of the molecular weight (M) and length (d) of polyvinyl acetate in suitable solvents1. According to light-scattering theory, the value of M/d2 should be independent of M. In fact, M/d2 increases in value as the temperature of synthesis is increased, showing that the polymer becomes more compact in structure, that is, branching becomes more pronounced.
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References
Bosworth, P., Masson, C. R., Melville, H. W., and Peaker, F. W., J. Polymer Sci. (in the press).
Carlin, R. B., and Hufford, D. L., J. Amer. Chem. Soc., 72, 4200 (1950).
Values for k f and k f′ have been calculated from data collected by Burnett, G. M., Quart. Rev., 4, 292 (1950).
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BEVINGTON, J., GUZMAN, G. & MELVILLE, H. Self-branching of Vinyl Polymers. Nature 170, 1026–1027 (1952). https://doi.org/10.1038/1701026a0
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DOI: https://doi.org/10.1038/1701026a0
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