Effect of epoxy soybean oil on properties of poly(lactic acid)/acidified lignin
In order to explore the effect of epoxidized soybean oil(ESO)on the compatibilization effect of polylactic acid(PLA)/acidified lignin(AL)composites,PLA/AL/ESO ternary composites were prepared by blending modification method.The microstructure of the composites was characterized by scanning electron microscopy.The effects of ESO content on the mechanical properties,crystallization behavior,rheological properties and thermal stability of the composites were studied.It is found that the introduction of ESO significantly improves the impact fracture morphology of PLA/AL composites,which changes from smooth and flat to fuzzy rough,thus significantly improving the toughness of the material.In addition,the addition of ESO reduces the initial thermal degradation temperature and the maximum thermal degradation temperature of the composites.At the same time,ESO reduces the melting temperature of the composites,and the crystallinity decreases first and then increases with the increase of ESO content.Rheological analysis show that the addition of an appropriate amount of ESO enhances the mobility of the polymer molecular chain,thereby reducing the viscosity of the composite.However,excessive ESO can lead to excessive entanglement of molecular chains,which limits the movement of PLA molecular chains.Studies have shown that ESO,as an effective plasticizer and compatibilizer,can significantly optimize the micro-interface of PLA/AL composites and improve the elongation at break and impact strength.However,the addition of ESO reduces the thermal stability,tensile strength and flexural strength of the material.
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