Abstract The flax and equivalent proportion of poly(L-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) were melt compounded and injection molded to prepare flax reinforced polylactide stereocomplex (sc-PLA) bio-composite, and two different coupling agents, hexamethylene diisocyanate (HMDI) and maleic anhydride grafted polypropylene (MAPP), were used to modify the interface of composite, then the influence of different interfacial modification on the structure and properties of composite was investigated. The results showed HMDI modification decreased the total crystallinity of composite but promoted the formation of stereocomplex crystallites (sc), whereas MAPP modification could improve both the total crystallinity and sc crystallinity. HMDI modification significantly improved the interfacial compatibility of composite, and thereby effectively improved the tensile strength and initial storage modulus of composite. By contrast, the interfacial compatibility of flax/sc-PLA composite was weakened by MAPP modification. Although the tensile properties of flax/sc-PLA/MAPP composite decreased, the impact strength of composite was increased by 12.1% than the unmodified composite. Therefore, the tailored flax/sc-PLA composite with varying properties could be prepared by different interfacial modification.

中文翻译：

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界面改性对亚麻增强聚乳酸立体络合物复合材料热机械性能的影响

摘要 将亚麻与当量比例的聚（L-乳酸）/聚（d-乳酸）（PLLA/PDLA）熔融复合并注塑成型，制备亚麻增强聚乳酸立体络合物（sc-PLA）生物复合材料，以及两种采用不同偶联剂六亚甲基二异氰酸酯（HMDI）和马来酸酐接枝聚丙烯（MAPP）对复合材料界面进行改性，研究了不同界面改性对复合材料结构和性能的影响。结果表明，HMDI 改性降低了复合材料的总结晶度，但促进了立体络合物微晶 (sc) 的形成，而 MAPP 改性可以提高总结晶度和 sc 结晶度。HMDI改性显着提高了复合材料的界面相容性，从而有效提高复合材料的拉伸强度和初始储能模量。相比之下，MAPP 改性削弱了亚麻/sc-PLA 复合材料的界面相容性。尽管亚麻/sc-PLA/MAPP复合材料的拉伸性能下降，但复合材料的冲击强度比未改性的复合材料提高了12.1%。因此，可以通过不同的界面改性制备具有不同性能的定制亚麻/sc-PLA复合材料。