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首页> 外文期刊>Journal of Polymers and the Environment >Biodegradation of Polylactide and Gelatinized Starch Blend Films Under Controlled Soil Burial Conditions
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Biodegradation of Polylactide and Gelatinized Starch Blend Films Under Controlled Soil Burial Conditions

机译：受控土壤埋藏条件下聚乳酸和糊化淀粉共混物膜的生物降解

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摘要

The biodegradability of polylactide (PLA) and gelatinized starches (GS) blend films in the presence of compatibilizer was investigated under controlled soil burial conditions. Various contents (0-40 wt%) of corn and tapioca starches were added as fillers; whereas, different amounts of methylenediphenyl diisocyanate (MDI) (0-2.5 wt%) and 10 wt% based on PLA content of polyethylene glycol 400 (PEG400) were used as a compatibilizer and a plasticizer, respectively. The biodegradation process was followed by measuring changes in the physical appearance, weight loss, morphological studies, and tensile properties of the blend films. The results showed that the presence of small amount of MDI significantly increased the tensile properties of the blends compared with the uncompatibilized blends. This is attributed to an improvement of the interfacial interaction between PLA and GS phases, as evidenced by the morphological results. For soil burial testing, PLA/GS films with lower levels (1.25 wt%) of MDI had less degradation; in contrast, at high level of MDI, their changes of physical appearance and weight loss tended to increase. These effects are in agreement with their water absorption results. Furthermore, biodegradation rates of the films were enhanced with increasing starch contents, while mechanical performances were decreased.
机译：研究了聚乳酸（PLA）和糊化淀粉（GS）共混薄膜在增容剂存在下在可控制的土壤埋藏条件下的生物降解能力。加入各种含量（0-40 wt％）的玉米和木薯淀粉作为填充剂。然而，基于聚乙二醇400（PEG400）的PLA含量，分别使用不同量的亚甲基二苯基二异氰酸酯（MDI）（0-2.5重量％）和10重量％作为增容剂和增塑剂。在生物降解过程之后，测量混合物膜的物理外观，重量损失，形态研究和拉伸性能的变化。结果表明，与不相容的共混物相比，少量MDI的存在显着提高了共混物的拉伸性能。如形态学结果所示，这归因于PLA和GS相之间界面相互作用的改善。对于土壤埋藏测试，MDI含量较低（1.25 wt％）的PLA / GS膜降解较少；相反，在高水平的MDI下，它们的物理外观和体重减轻的变化趋于增加。这些效果与其吸水结果一致。此外，随着淀粉含量的增加，薄膜的生物降解率提高，而机械性能下降。

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  • 来源
    《Journal of Polymers and the Environment》 |2013年第1期|95-107|共13页
  • 作者

    Worasak Phetwarotai; Pranut Potiyaraj; Duangdao Aht-Ong;

  • 作者单位

    Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand,Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330,Thailand;

    Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand,Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330,Thailand;

    Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand,Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330,Thailand;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    polylactide; starch; blend; film; biodegradation;

    机译：聚丙交酯淀粉;混合;电影;生物降解;

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