Effects of Sunshine Duration and Precipitation on the Degradation Rate of Poly (L-Lactic Acid)
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概要
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Effects of sunshine duration and precipitation on the degradation of poly (L-Lactic acid) (PLA) have been investigated by applying multiple regression analysis. The analysis showed that the tensile strength of PLA exposed to outdoor can be described by <I>kW</I> and <I>k'U</I>, where <I>k</I> and <I>k'</I> are rate constants of hydrolysis and photodecomposition, respectively, and <I>W</I> is precipitation, U is sunshine duration. The contribution of <I>k'U</I> to the degradation of PLA was 1.5 times of <I>kW</I>. Hydrolysis and photodecomposition tests for PLA were also carried out in laboratory. The activation energy of hydrolysis and photodecomposition were 81.1kJ/mol and 66.9kJ/mol, respectively. These results suggested that the degradation caused by solar radiation was prominent than that by precipitation.
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