Preparation and Characterization of Three-Element Compound Plasticizing Bamboo Fiber-g-Polylactic Acid/Polylactic Acid Composite

Abstract

In view of the phenomenon that the interfacial adhesion between bamboo fiber（BF）and polylactic acid (PLA) is poor and incompatible. Firstly the BF-g-PLA structure with hydrophobicity is synthesized through grafting lactic acid into bamboo fiber, then plasticizing the composite. Three-element compound plasticizer was prepared by mixing glycerol, tributyl citrate and formamide. The effect of the proportion and addition content of three-element plasticizer on the interfacial compatibility of the composite was investigated. The BF-g-PLA/PLA composites were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and rotational rheometer (RC) The composites were tested for their bending properties, tensile properties and water resistance properties using national standards. The experimental results show that the best interfacial adhesion between BF-g-PLA and PLA was obtained when the addition content of glycerol, tributyl citrate, formamide was 10%. At the same time, the flexural strength, elastic modulus, tensile strength and elongation at break of composites all reached the maximum, as well as the thermal stability and the storage modulus.