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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Matrix-Particle Interfacial Adhesion on the Mechanical Properties of Poly(lactic acid)/Wood-Flour Micro-Composites
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Effect of Matrix-Particle Interfacial Adhesion on the Mechanical Properties of Poly(lactic acid)/Wood-Flour Micro-Composites

机译：基质-颗粒界面粘合对聚乳酸/木粉微复合材料力学性能的影响

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摘要

The influence of interfacial matrix/particle adhesion on the mechanical properties of poly(lactic acid) (PLA) micro-composites was investigated. The tensile strength of PLA/wood-flour micro-composites is almost independent of wood-flour content, suggesting only weak adhesion exists between the PLA matrix and the wood-flour particles. The addition of wood-flour resulted in an increase of up to 95% in the tensile modulus, in comparison with pure PLA, which showed a more resilient matrix. The addition of a coupling agent, methylenediphenyl-diisocyanate (MDI) to the composition resulted in an increase in tensile strength and tensile modulus of the micro-composites, of 10 and 135%, respectively, indicating enhanced matrix-particle interfacial adhesion. SEM and electron probe microanalysis provided evidence of improved interfacial adhesion between PLA, and wood-flour particles from the addition of MDI. In contrast, addition of PEAA resulted in a micro-composite displaying substantially reduced tensile strength, up to 35%rnand a slightly increased in impact strength, up to 15%, consistent with the introduction of the rubbery PEAA component into the polymeric matrix. No evidence for increased matrix-particle adhesion was found for the PLA/ wood-flour micro-composites containing PEAA.
机译：研究了界面基质/颗粒粘附对聚乳酸（PLA）微复合材料力学性能的影响。 PLA /木粉微复合材料的拉伸强度几乎与木粉含量无关，这表明PLA基质与木粉颗粒之间仅存在较弱的附着力。与纯PLA相比，木粉的添加使拉伸模量最多提高了95％，而纯PLA表现出了更高的弹性。向组合物中添加偶联剂亚甲基二苯基二异氰酸酯（MDI）导致微复合材料的抗张强度和拉伸模量分别增加了10％和135％，表明增强的基质-颗粒界面粘合力。 SEM和电子探针显微分析提供了通过添加MDI改善PLA与木粉颗粒之间的界面粘合的证据。相反，添加PEAA导致微复合材料显示出显着降低的拉伸强度，至多35％rn，并且冲击强度略有增加，至多15％，这与将橡胶状PEAA组分引入聚合物基体一致。对于含有PEAA的PLA /木粉微复合材料，未发现增加基质-颗粒附着力的证据。

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