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首页> 外文期刊>Polymer Degradation and Stability >Poly L-lactide-layered double hydroxide nanocomposites via in situ polymerization of L-lactide
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Poly L-lactide-layered double hydroxide nanocomposites via in situ polymerization of L-lactide

机译：原位聚合L-丙交酯的聚L-丙交酯层状双氢氧化物纳米复合材料

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摘要

The use of clay nanofillers offers a potential route to improved barrier properties in polylactide films. Magnesium-aluminium layered double hydroxides (LDHs) are interesting in this respect and we therefore explored synthesis of PLA-LDH nanocomposites by ring-opening polymerization. This method is attractive because it should ensure good dispersion of LDH in the polymer. The effect of adding either LDH carbonate (LDH-CO_3) or laurate-modified LDH (LDH-C12) was investigated. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy revealed that exfoliated nanocomposites were obtained when using LDH-C12 but that LDH-CO3 gave a partly phase-separated morphology. Thermogravimetric analysis showed that PLA-LDH combinations exhibited higher degradation onset temperatures and differential scanning calorimetry confirmed that LDHs can act as nucleating agents. However, PLA molecular weight was significantly reduced when in-situ polymerization was conducted in the presence of the LDHs and we suggest that chain termination via LDH surface hydroxyl groups and/or metal-catalyzed degradation could be responsible.
机译：粘土纳米填料的使用为改善聚丙交酯薄膜的阻隔性能提供了一条潜在途径。镁铝层状双氢氧化物（LDHs）在这方面很有趣，因此我们探索了通过开环聚合反应合成PLA-LDH纳米复合材料的方法。该方法是有吸引力的，因为它应确保LDH在聚合物中的良好分散。研究了添加LDH碳酸盐（LDH-CO_3）或月桂酸酯改性的LDH（LDH-C12）的效果。 X射线衍射，扫描电子显微镜和透射电子显微镜显示，当使用LDH-C12时，获得了剥落的纳米复合材料，但是LDH-CO3给出了部分相分离的形态。热重分析表明，PLA-LDH组合物表现出更高的降解起始温度，差示扫描量热法证实了LDH可以作为成核剂。但是，当在LDHs存在下进行原位聚合时，PLA分子量显着降低，我们建议通过LDH表面羟基和/或金属催化的降解来终止链。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第12期|p.2563-2573|共11页
  • 作者

    Vimal Katiyar; Nathalie Gerds; Christian Bender Koch; Jens Risbo; Hans Christian B. Hansen; David Plackett;

  • 作者单位

    Solar Energy Programme, Rise National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark,Department of Food Science, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg, Denmark;

    Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    Department of Food Science, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg, Denmark;

    Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    Solar Energy Programme, Rise National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polylactide; layered double hydroxides; nanocomposite; in-situ polymerization;

    机译：聚丙交酯层状双氢氧化物;纳米复合材料原位聚合;

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