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Kanaya, Toshiji*; Kakurai, Kazuhisa; Tsukushi, Itaru*; Inoue, Rintaro*; Watanabe, Hiroshi*; Nishi, Masakazu*; Nakajima, Kenji; Takemura, Kazuhiro*; Furuya, Hidemine*
Journal of the Physical Society of Japan, 74(12), p.3236 - 3240, 2005/12
Times Cited Count:6 Percentile:41.24(Physics, Multidisciplinary)We performed thermal neutron spin echo measurements on a glass-forming polymer, deuterated polybutadiene (-[CD-CD=CD-CD
]
-; PB-d
), in a high
range up to 3.5
covering the first and second peaks of the structure factor S(
), and evaluated the decay rate
(
) of the coherent intermediate scattering function as a function of
. In contrast to the previous experimental findings on the first peak of S(
) at
= 1.5
, no "de Gennes" type narrowing was observed on the second peak at
= 2.9
. This novel finding indicates that the narrowing is hidden by the distinct motions of the soft -CD
-CD
- and =CD-CD
- units and the self-motions of the rigid and soft units in the
range around the second peak.