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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.

Effect of interfacial modification on the thermo-mechanical properties of flax reinforced polylactide stereocomplex composites