PLA/PHB/玄武岩纤维复合材料的制备以及加工性能和热性能
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南昌大学机电工程学院

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TQ327

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国家自然科学基金资助项目(51365038)


Preparation, Processing Performance and Thermal Performance of PLA/PHB/Basalt Fiber Composites
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    摘要:

    聚乳酸(PLA)和聚β-羟基丁酸酯(PHB)应用于环保、可降解生物材料,玄武岩纤维是可再生资源基与生物可降解聚合物共混的潜在加固材料,因此,制备能够替代石油基塑料的环保、可降解的高性能生物复合材料,将成为很有意义的研究。以聚乳酸(PLA)、聚β-羟基丁酸酯(PHB)和玄武岩纤维(BF)为原料,通过一步反应熔融共混工艺,注塑成型制备出BF/PLA/PHB复合材料。探究含有不同含量BF的PLA/PHB基体复合材料的力学、热以及流变性能的影响。通过拉伸测试,BF/PLA/PHB复合材料中玄武岩含量增加到10wt%时,复合材料拉伸强度和断裂伸长率虽然达到最大,但上升幅度明显减弱。通过XRD以及DSC分析得出BF的加入,在PLA/PHB基体当中起到异相成核的作用,提升了PLA/PHB基体材料的结晶度,复合材料中BF含量超过5%时,结晶度提升明显减弱,达到阈值。通过旋转流变仪表征得出复合材料BF/PLA/PHB中BF含量增加到2wt%时,达到流变渗流阈值,继续增加BF含量,其复合材料的复数黏度将会显著提升,流动性差,不利于工程应用加工。

    Abstract:

    This work considers the application of environmentally friendly and degradable biomaterials of polylactic acid and poly-β-hydroxybutyrate, and basalt fiber as one of the most promising potentialreinforcement materials for renewable resource-based biodegradable polymers.The preparation of environmentally friendly and degradable high-performance biocomposites that can replace petroleum-based plastics will become a very meaningful research.Using polylactic acid (PLA), poly β-hydroxybutyrate (PHB) and basalt fiber (BF) as raw materials, BF/PLA/PHB composite materials are prepared by injection molding through a one-step reaction melt blending process.Explore the effects of the tensile strength and elongation at break, thermal properties and rheological properties of PLA/PHB matrix composites with different contents of BF.Through the tensile test, when the basalt content in the PLA/PHB/BF composite material is increased to 10wt%, although the tensile strength and elongation at break of the composite material reach the maximum, the increase rate is obviously weakened.Through XRD diffractometer and differential scanning thermal analysis, it is concluded that the addition of basalt fiber can play a role of heterogeneous nucleation in the PLA/PHB matrix, which improves the crystallinity of the PLA/PHB matrix material. The content of basalt fiber in the composite material exceeds At 5%, the increase in crystallinity is significantly weakened and reaches the threshold.Characterization by rotating rheometer shows that when the content of PLA/PHB/BF basalt in the composite material increases to 2wt%, the rheological seepage threshold is reached. If the content of basalt fiber continues to increase, the complex viscosity of the composite material will be significantly increased, and the fluidity will be poor. Conducive to engineering application processing.

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  • 收稿日期:2021-12-24
  • 最后修改日期:2022-04-07
  • 录用日期:2022-04-24
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