Abstract
Samples of poly(D,L-β-methyl β-propiolactone) (PMPL) were prepared and studied in several solvents by light scattering and viscometry. No differences between PMPL and its isotactic homolog, poly(D-β-hydroxybutyrate) (PHB) could be observed in either the molecualr dimensions or thermodynamic properties. The values of the radius-expansion factor αs for PMPL and PHB in TFE at 25°C were calculated on the basis of the characteristic ratio 〈S2〉0/Mw estimated from [η]0 of PMPL in butyl chloride at 13°C, a theta solvent for the polymer. These values increased in proportion to Mw1/5, in accord with the fifth-power theories for flexible linear polymers. In contrast to the prediction from the current two-parameter theory, the values of A2Mw/[η] for PMPL in THF as a function of αη3≡[η]/[η]0 showed a systematic deviation from literature data for αη3<5 and continuously ascended as αη3 approached unity.
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Hirosye, T., Einaga, Y. & Fujita, H. Excluded-Volume Effects in Dilute Polymer Solutions. VIII. Poly(D,L-β-methyl β-propiolactone) in Several Solvents and Reanalysis of Data on Poly(D-β-hydroxybutyrate). Polym J 11, 819–826 (1979). https://doi.org/10.1295/polymj.11.819
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DOI: https://doi.org/10.1295/polymj.11.819