Abstract
Anisotropic dynamics of benzonitrile (BzCN) confined in the cocrystalline region of syndiotactic polystyrene (sPS) was studied by means of dielectric spectroscopy. Especially examined was the effect of orientation of the crystalline phase for two types of cocrystals, δ and e clathrates, on the dielectric relaxation behavior. The relaxation time of the BzCN in the δ cocrystal, regardless of its orientation, was found to be longer than that in the e cocrystal, indicating that the δ structure has higher degree of constraint on the guest motion than the e structure. With respect to dielectric intensity Δe due to the guest BzCN relaxation, uniaxial stretching treatment caused different effects in the δ and e cocrystals: Δe increased for the δ cocrystal and decreased for the e crystal by stretching. This observation was attributable to the difference in directionality of anisotropic motion of the guest molecule inside the cavities of these cocrystals. The preferable orientation of the molecular axis of BzCN cor...
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