生分解性プラスチックの伝導電流に及ぼす湿度の影響

概要

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A polylactic acid (PLA) that is a biodegradable plastic, was subjected to measurements of conduction current and dielectric properties. For the electrical properties of PLA, its volume resistivity (ρ) was larger than those of polyethylene (PE) and polypropylene (PP). The relative permittivity (ε_r') indicated intermediate values between that of polyester and those of polyethylene (PE) and polypropylene (PP). The dielectric loss tangent (tanδ) was larger than those of PE and PP, but smaller than that of Polyester. From the results of temperature dependence of J of a PLA, PE and PP, J of PLA became smaller than PE and PP in the temperature from room temperature to 90℃. However, when it became 90℃ higher, J of PLA became larger than other plastics. The time dependability of J of PLA which absorbed moisture was investigated. Consequently, although J of PLA became high by moisture absorption, it becomes a value lower than PE and PP.
2004-02-27