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首页> 外文期刊>Journal of Polymers and the Environment >The Effect of Gamma and Electron Beam Irradiation on the Biodegradability of PLA Films
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The Effect of Gamma and Electron Beam Irradiation on the Biodegradability of PLA Films

机译：γ和电子束辐照对PLA薄膜生物降解性的影响

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摘要

Biodegradation of poly(lactic) acid (PLA) has been studied extensively, but there is only limited knowledge about the effect of irradiation sterilization on its biodegradability. The aim of this work was to examine the aerobic biodegradation of gamma and electron beam irradiated PLA films along with the effects of aging (3, 6, and 9 months of storage) using a direct measurement respirometric system. Commercial PLA film was exposed to a simulated aerobic compost environment, and its mineralization was 96 % at day 85. Gamma and electron beam irradiation affected the biodegradation of the post-irradiated PLA film. Aging irradiated PLA had some potential to increase the biodegradation rate, as the average value of mineralization after 9 months of storage was higher than for the non-irradiated PLA. Comparison of the effect of storage time on the biodegradability of PLA showed a significant increase in biodegradation of the gamma irradiated PLA after 3 months (70 %) and 9 months of storage (130 %). Similarly, there was a significant difference in the biodegradation of electron beam irradiated PLA between 3 months (68 %) and 9 months of storage (120 %). Due to the priming effect, the percent mineralization of gamma irradiated and E-beam irradiated PLA after 9 months of storage was greater than 100 %. Both non-irradiated and irradiated PLA films can be considered biodegradable plastics since they showed mineralization percentage larger than 90 % of that of the positive control at the end of the test period.
机译：聚乳酸（PLA）的生物降解已被广泛研究，但是关于辐照灭菌对其生物降解性的影响的知识还很有限。这项工作的目的是使用直接测量呼吸测量系统检查伽玛射线和电子束辐照的PLA膜的需氧生物降解以及老化的影响（存储3、6和9个月）。商业化的PLA薄膜暴露于模拟的需氧堆肥环境中，在第85天的矿化率为96％。伽马射线和电子束辐照影响了辐照后的PLA薄膜的生物降解。老化辐照的PLA有一定的潜力提高生物降解速度，因为储存9个月后的矿化平均值高于未辐照的PLA。比较储存时间对PLA的生物降解性的影响，显示在3个月（70％）和9个月（130％）的γ辐照下的PLA的生物降解显着增加。同样，电子束辐照的PLA在3个月（68％）和9个月（120％）的生物降解之间存在显着差异。由于引发效应，储存9个月后，γ射线和电子束照射的PLA的矿化百分比大于100％。未辐照和辐照的PLA膜都可以被视为可生物降解的塑料，因为它们在试验期结束时显示出的矿化率大于阳性对照的矿化率的90％。

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