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首页> 外文期刊>RSC Advances >In situ formation of PLA-grafted alkoxysilanes for toughening a biodegradable PLA stereocomplex thin film
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In situ formation of PLA-grafted alkoxysilanes for toughening a biodegradable PLA stereocomplex thin film

机译：原位形成PLA接枝的烷氧基硅烷，用于增韧生物降解的PLA立体复合薄膜

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Poly(lactide) (PLA) has received tremendous attention recently from researchers and industrialists due to its ability to solve environmental problems related to plastic pollution. However, PLA's brittleness, poor thermal stability, low elongation at break, and poor melt processing prevent its use in a broader spectrum of applications. Herein, we produced a very tough and thermally more stable PLA stereocomplex by simply mixing PLA with organoalkoxysilane. The stereocomplex PLA/silane (sc-PLA-silane) composite was prepared by simple mixing of three types of organoalkoxysilanes in sc-PLA followed by in situ formation of a silane-based rubbery core with a cross-linked PLA shell. Mechanical and thermal properties were improved by stereocomplexation of PLA with a small amount (1-5 wt%) of PLA-grafted silanes. The addition of organoalkoxysilane with different functional groups resulted in a plasticizer of rubbery silica-PLA core-shell gel through in situ condensation and grafting of long PLA chains at the interface between the stereocomplex and silane particles. The results revealed that the toughness of sc-PLA was improved dramatically with only a small addition (only 2.5%) of 3-(triethoxysilyl)propyl isocyanate (ICPTES). The morphology and mechanical and thermal properties of the toughened stereocomplex films were characterized. The results revealed that elongation at break was increased from 16% to 120%, while other mechanical properties such as tensile strength and modulus were retained. Surface analysis confirmed that this toughness was achieved by formation of a silica-PLA core-shell gel. The mechanical properties of PLA were improved without any significant reduction in modulus and tensile strength using this simple methodology.
机译：聚丙交酯（PLA）已经获得了巨大的关注最近从研究人员和企业家，因为它解决与塑料污染环境问题的能力。然而，PLA的脆性，差的热稳定性，断裂伸长率低，和熔融加工差防止其在应用的范围更广的用途。在此，我们制作了一个非常艰难的，热稳定PLA立体复合通过简单地用有机烷氧基硅烷混合PLA。立体络合物聚乳酸/硅烷（SC-PLA-硅烷）复合的制备是通过在SC-PLA三种类型的有机烷氧基硅烷的的简单混合，随后在原位形成与交联PLA壳基于硅烷的橡胶芯的。机械和热性能，通过PLA的立体络合物与PLA接枝的硅烷的少量（1-5重量％）的提高。在加入具有不同官能团的有机烷氧基硅烷通过原位缩合，并在立构和硅烷颗粒之间的界面长PLA链嫁接导致橡胶状二氧化硅-PLA芯 - 壳凝胶的增塑剂。结果表明，SC-PLA的韧性与仅少量添加显着改善的3-（仅为2.5％）（三乙氧基硅基）丙基异氰酸酯（ICPTES）。形态和增韧立体络合物膜的机械和热性能进行了表征。结果表明，断裂伸长率从16％提高到120％，而其它机械性能，如拉伸强度和模量保留。表面分析确认这韧性通过形成二氧化硅-PLA芯 - 壳凝胶来实现。 PLA的机械性能，而无需使用这种简单的方法在弹性模量和拉伸强度的任何降低显著得到改善。

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  • 来源
    《RSC Advances》 |2019年第38期|共12页
  • 作者

    Jeong Jieun; Ayyoob Muhammad; Kim Ji-Heung; Nam Sung Woo; Kim Young Jun;

  • 作者单位

    Sungkyunkwan Univ Dept Chem Engn Nat Sci Campus 2066 Seobu Ro Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Engn Nat Sci Campus 2066 Seobu Ro Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Engn Nat Sci Campus 2066 Seobu Ro Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Engn Nat Sci Campus 2066 Seobu Ro Suwon 16419 South Korea;

    Sungkyunkwan Univ Dept Chem Engn Nat Sci Campus 2066 Seobu Ro Suwon 16419 South Korea;

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