生分解性プラスチック(ポリ乳酸)の吸湿誘電特性及び劣化について : プラスチックの吸湿特性第7報

概要

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Measurements of moisture absorption properties of polylactic acid and on the effect of moisture adsorption and dehydration for dielectric properties, the specimens are prepared by cutting from PLA sheet by Mitsui Chemicals Inc.. Dielectric properties over frequency range from 30Hz to 1M Hz and refractive index were measured at room temperature. The results obtained are as follows; 1) Saturated moisture content of PLA is 0.5% at 75% relative humidity, at 30℃ and depends on relative humidity 2) The diffusion coefficient of PLA is about 5.5×10^<-8>cm^2/sec at 30℃, and as relative humidity increases, that value also decreases further. 3) In dry condition, the refractive index of PLA can be obtained at the measured value of 1.46, and that value decreases accompanied with moisture content. 4) Dielectric constant ε' and loss factor ε" of the PLA increase with moisture adsorption and dehydration