Dynamic Mechanical Behavior of Second-Generation Dendronized Wedge-Type Polymer

ORAL

Abstract

The dynamic mechanical behavior of second-generation dendronized wedge-type polymer synthesized by ring-opening metathesis polymerization have been measured. By applying time-temperature superposition (TTS) principle, the master curve was constructed over the frequencies ranging from terminal regime to glassy regime. An extremely low glassy modulus of 100 MPa is observed which may be due to the bulky densely placed side groups in the structure. Upon further investigation, the apparent extremely low rubbery plateau of approximately 16 kPa in the dynamic response and Van Gurp-Palmen plot is found to be related to the steady state recoverable compliance. Absolute heat capacity measurements showed large heat capacity (CP) in the glassy regime and a small ΔCP of 0.076 J/(gK) at the glass transition, which indicates a high degree of freedom in the glassy state.

*The authors are thankful to the J. R. Bradford Endowment and the Graduate School at Texas Tech University for support for this work.

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Presenters

  • Zhiyuan Qian

    • Department of Chemical Engineering, Texas Tech University

Authors

  • Zhiyuan Qian

    • Department of Chemical Engineering, Texas Tech University

  • Yung Pyo Koh

    • Chemical Engineering, Texas Tech University
    • Texas Tech Univ
    • Department of Chemical Engineering, Texas Tech University

  • Alice Chang

    • Division of Chemistry and Chemical Engineering, California Institute of Technology
    • California Institute of Technology
    • Chemistry, California Institute of Technology
    • 2. Division of Chemistry and Chemical Engineering, California Institute of Technology

  • Tzu-Pin Lin

    • Division of Chemistry and Chemical Engineering, California Institute of Technology
    • California Institute of Technology
    • Chemistry, California Institute of Technology

  • Pablo E. Guzman

    • Energetics Technology Branch, U.S. Army Research Laboratory

  • Robert Grubbs

    • Division of Chemistry and Chemical Engineering, California Institute of Technology
    • California Institute of Technology
    • Chemistry, California Institute of Technology
    • 2. Division of Chemistry and Chemical Engineering, California Institute of Technology

  • Sindee Simon

    • Chemical Engineering, Texas Tech University
    • Texas Tech Univ
    • Department of Chemical Engineering, Texas Tech University
    • Chemical Engineering, Texas Tech Univ

  • Gregory McKenna

    • Chemical Engineering, Texas Tech Univ
    • Department of Chemical Engineering, Texas Tech University
    • Chemical Engineering, Texas Tech University