高分子材料の温度伝導率の異方性に関する研究 : 第2報, 溶融流動場における流動パターンと異方性の関係

概要

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In the previous report, we have studied an anisotropy of the thermal diffusivity of molded PMMA spiral-flow samples by means of the forced Rayleigh scattering method. This anisotropy of thermal properties was caused by the orientation of polymer molecules under shear flow field in the mold. In the present paper, the anisotropy of the thermal diffusivity due to molecular orientation in shear flow was experimentally measured for the sample in molten and flowing condition. One-dimensional flow of molten polymer was created in a thin rectangular visualized conduit with a plunger extruder, and the anisotropic behavior was investigated for molten polystylene at different temperatures and different velocity profiles. It was shown as possible to measure the thermal diffusivity of molton polymer in its flowing condition by mean of the forced Rayleigh scattering method. The ratio of a‖, the thermal diffusivity in the direction parallel to the flow, to a ⊥, that rectangular to the flow, increases with a mean velocity increase. It was shown that all of measured thermal diffusivity can be correlated using Re number as a parameter.
1992-08-25