高分子材料の温度伝導率の異方性に関する研究 : 第1報, 流動固化試料における射出条件と異方性の関係

概要

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Under mechanical deformation in the solid state or shear stress in the molten state, molecular orientation takes place in polymer materials. This orientation of long chain molecules causes the anisotropy of not only mechanical strength but also of thermophysical properties. Although the anisotropic behavior of thermophysical properties is important information needed for advanced applications of polymer materials, no reliable methods for determining direction dependence of, for example, the thermal diffusivity are available. In the present study, anisotropic behavior of thermal diffusivity was experimentally studied in PMMA samples shaped in a spiral testing mold by an injection molding machine. The method used was the forced Rayleigh scattering method, a newly developed optical method. The influences of such factors as temperature of the melt, solidification process and the backpressure were quantitatively measured, and the relations among shear stress, molecular orientation and thermal anisotropy were discussed.
一般社団法人日本機械学会の論文
1992-05-25