Thermal Neutron Spin-Echo Studies on Dynamics of a Glass-Forming Polymer in a High Q Range(Condensed Matter : Structure, Mechanical and Thermal Properties)

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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.
社団法人日本物理学会の論文
2005-12-15