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Synthesis and characterization of propylene-α-olefin random copolymers with isotactic propylene sequence. II. Propylene–hexene-1 random copolymers

Authors

  • Yong-Woo Shin,

    1. School of Materials Science, Japan Advanced Institute Science and Technology, Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan
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  • Hideto Hashiguchi,

    1. School of Materials Science, Japan Advanced Institute Science and Technology, Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan
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  • Minoru Terano,

    1. School of Materials Science, Japan Advanced Institute Science and Technology, Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan
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  • Koh-hei Nitta

    Corresponding author
    1. Department of Chemistry and Chemical Engineering, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa, Ishikawa 920-8667, Japan
    • School of Materials Science, Japan Advanced Institute Science and Technology, Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan
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Abstract

A series of novel hexene-1–propylene random copolymers with isotactic sequence of propylene was synthesized with a MgCl2-supported Cr(acac)3 catalyst. The molecular weight distribution of copolymers and homopolymers was considerably narrower than that of typical polyolefins produced by heterogeneous Ziegler–Natta catalysts. The crystallizability of the copolymers having a propylene-unit content of more than 50 mol % drastically decreased with decreasing propylene-unit content, and the copolymers with a propylene content of less than 50 mol % were completely amorphous. In the present novel type of random copolymers with crystallizable and noncrystallizable units, a single glass transition was observed between pure polypropylene and polyhexene-1, and a major component was found to govern the final morphology and the mechanical characteristics. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2949–2954, 2004

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