Thermal Neutron Spin-Echo Studies on Dynamics of a Glass-Forming Polymer in a High Q Range

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Author(s)

Abstract

We performed thermal neutron spin echo measurements on a glass-forming polymer, deuterated polybutadiene (-[CD_2-CD=CD-CD_2]_n-; PB-d_6), in a high Q range up to 3.5Å^<-1> covering the first and second peaks of the structure factor S(Q), and evaluated the decay rate Γ(Q) of the coherent intermediate scattering function as a function of Q. In contrast to the previous experimental findings on the first peak of S(Q) at Q=1.5Å^<-1>, no 'de Gennes' type narrowing was observed on the second peak at Q=2.9Å^<-1>. This novel finding indicates that the narrowing is hidden by the distinct motions of the soft -CD_2-CD_2- and =CD-CD_2- units and the self-motions of the rigid and soft units in the Q range around the second peak. The temperature dependence of the relaxation rate Γ(Q) suggests that in the high Q range beyond the first peak of S(Q) the conformational changes in a deutrated PB chain are mainly observed.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 74(12), 3236-3240, 2005-12-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110002975245
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    7741209
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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