Structural changes of semicrystalline polyolefin block copolymer elastomers during step cycle mechanical processing

ORAL

Abstract

Development of stereo- and regioselective catalysts has led to the capability to produce multiblock copolymers with crystalline isotactic or syndiotactic polypropylene blocks and ethylene-r-propylene rubbery blocks which have excellent elastomeric properties. During step cycle mechanical processing the crystals can plastically deform and transform from lamellae into rod-like fibrils. The stress-strain tensile curves provide evidence of dramatic changes in the mechanical properties and small angle and wide angle X-ray scattering experiments as well as real space imaging bring a better understanding of the structural changes of the crystals during such processing.

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Authors

  • Fanny Deplace

    • MC-CAM and the Departments of Materials and Chemical Engineering, University of California, Santa Barbara, CA

  • Zhigang Wang

    • MC-CAM and the Departments of Materials and Chemical Engineering, University of California, Santa Barbara, CA

  • Philip Hustad

    • Departments of Chemistry and Chemical Biology, Cornell University, NY

  • Juan Tian

    • Departments of Chemistry and Chemical Biology, Cornell University, NY

  • Jeffrey M. Rose

    • Departments of Chemistry and Chemical Biology, Cornell University, NY

  • Geoffrey W. Coates

    • Departments of Chemistry and Chemical Biology, Cornell University, NY
    • Cornell University, Chemistry, Ithaca, NY 14853

  • Fumihiko Shimizu

    • Mitsubishi Chemical Group, Science and Technology Research Center, Japan

  • Shigeyuki Toki

    • SUNY Stony Brook, Department of Chemistry, Stony Brook, NY

  • Lixia Rong

    • SUNY Stony Brook, Department of Chemistry, Stony Brook, NY

  • Jie Zhu

    • SUNY Stony Brook, Department of Chemistry, Stony Brook, NY

  • Benjamin Hsiao

    • SUNY Stony Brook, Department of Chemistry, Stony Brook, NY
    • Chemistry Department, Stony Brook University

  • Glenn Fredrickson

    • University of California, Santa Barbara
    • University of California Santa Barbara
    • MC-CAM and the Departments of Materials and Chemical Engineering, University of California, Santa Barbara
    • Materials Research Lab, UCSB, CA

  • Edward Kramer

    • MC-CAM and the Departments of Materials and Chemical Engineering, University of California, Santa Barbara
    • University of California Santa Barbara
    • UCSB
    • University of California, Santa Barbara
    • Department of Materials and Department of Chemical Engineering, University of California Santa Barbara
    • Materials Research Laboratory UCSB, Materials Department UCSB
    • Materials Research Laboratory and Materials Department, UCSB
    • UC Santa Barbara
    • Material Research Lab, UC Santa Barbara