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