Copolymer composition as a function of molecular weight and the effect of conversion on this relationship

Authors

  • Francis M. Mirabella Jr.,

    1. Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06268
    Current affiliation:
    1. ARCO/Polymers, Inc., Monroeville, Pa. 15146
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  • Edward M. Barrall II,

    1. Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06268
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    • On leave from IBM Research Laboratory, San Jose, California

  • Edmund F. Jordan Jr.,

    1. Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Philadelphia, Pennsylvania 19118
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  • Julian F. Johnson

    1. IBM Research Laboratory, San Jose, California 95193
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    • On leave from University of Connecticut


Abstract

The copolymer compositions as a function of molecular weight for three poly(styrene-co-vinyl stearate) copolymers of widely varying conversion were determined. A combined gel permeation chromatography–infrared spectroscopy method was used. Theoretical changes in copolymer composition were calculated using reactivity ratios. Comparison of the calculated and observed changes in copolymer composition as a function of molecular weight showed qualitative agreement. However, the observed changes in composition were significantly larger than those calculated.

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