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首页> 外文期刊>Materials Science and Engineering >Improvement of microstructures and properties of biodegradable PLLA and PCL blends compatibilized with a triblock copolymer
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Improvement of microstructures and properties of biodegradable PLLA and PCL blends compatibilized with a triblock copolymer

机译:与三嵌段共聚物相容的可生物降解的PLLA和PCL共混物的微观结构和性能的改善

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摘要

Incompatibility and immiscible binary blends of poly(L-lactide) (PLLA) and poly(ε-caprolactone) (PCL) with 70/30 wt.% composition were modified and prepared by addition of 0.5,1 and 2 phr of polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) triblock copolymer. The effect of the copolymer ratio on the microstructures and properties of the blends was investigated using proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscope (FE-SEM), dynamic mechanical analysis, differential scanning calorimetry, thermo-gravimetric analysis, and Mode I fracture testing. The addition of the copolymer to PLLA/PCL improved its fracture toughness. A reduction in the amount of spherical of PCL upon the addition of copolymers was confirmed by FE-SEM. The glass transition temperature (T_g) and melting temperature (T_m) of PLLA and PCL shifted closer together, indicating that the blend compatibility increased. Thus, PEO-PPO-PEO can be employed as compatibilizer to improve the toughness and compatibility of PLLA/PCL blends.
机译:组成70/30 wt。%的聚(L-丙交酯)(PLLA)和聚(ε-己内酯)(PCL)的不相容性和不混溶的二元共混物经过改性并通过添加0.5、1和2 phr的聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(PEO-PPO-PEO)三嵌段共聚物。使用质子核磁共振波谱,傅立叶变换红外光谱,X射线衍射,场发射扫描电子显微镜(FE-SEM),动态力学分析,差示扫描法研究了共聚物比例对共混物微观结构和性能的影响。热量分析,热重分析和模式I断裂测试。将共聚物添加到PLLA / PCL中可改善其断裂韧性。通过FE-SEM证实在添加共聚物时PCL的球形量的减少。 PLLA和PCL的玻璃化转变温度(T_g)和熔融温度(T_m)移得更近,表明共混物相容性增加。因此,PEO-PPO-PEO可用作相容剂,以改善PLLA / PCL共混物的韧性和相容性。

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  • 来源
    《Materials Science and Engineering》 |2010年第26期|p.6930-6937|共8页
  • 作者单位

    School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia,Department of Mechanical Engineering, Faculty of Engineering, National University of Laos, P.O. Box 3166, Vientiane, Laos,Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan;

    School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia;

    School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia;

    Department of Mechanical Engineering, Faculty of Engineering, National University of Laos, P.O. Box 3166, Vientiane, Laos;

    Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan;

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

    biodegradable; polymer blend; compatibility; phase-separation; poly(l-lactic acid); poly(ε-caprolactone);

    机译:可生物降解聚合物共混物兼容性;相分离聚(l-乳酸);聚(ε-己内酯);

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