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New models for the prediction of the relaxation behavior of vinyl polymers with bulky side groups and α-methyl groups in the primary transition region

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Summary

Modified models for the prediction of the slope index of the viscoelastic master curve in the primary transition region for vinyl polymers with either bulky side groups or α-methyl groups have been proposed. Very good agreeements between predicted and experimental values are found. The modified models take into account of the effect of the bulky side group or α-methyl groups in the contribution to the corrected number of the main-chain atoms. The predicted slope index was found to be proportional to (i) the average cohesive energy per main-chain atom; U/N, which represents the enthalpic interchain interaction, (ii) the entropic intrachain interaction as defined by H/N, and (iii) the average spatial molecular volume per main-chain atom V/N.

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  1. Avery Research Center, 2900, Bradley St., 91107, Pasadena, CA, USA

    E. P. Chang

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  1. E. P. Chang
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Chang, E.P. New models for the prediction of the relaxation behavior of vinyl polymers with bulky side groups and α-methyl groups in the primary transition region. Polymer Bulletin 24, 405–411 (1990). https://doi.org/10.1007/BF00294094

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  • DOI: https://doi.org/10.1007/BF00294094

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