1 College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004; 2 Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education,Northeast Forestry University, Harbin 150040
Abstract: Starch/PLA composites were prepared by melt extrusion, in which corn starch and poly (lactic acid) (PLA) served as raw materials, maleic anhydride (MAH) as modifier. The effects of the two modifying methods by MAH, i.e. MAH as compatibilizing agent and MAH as esterifying agent of starch, on the compatibility of starch/PLA were studied. The melt processing property, mechanical properties and water resistance of composites were also tested. X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA) results showed that the esterified starch/PLA composite prepared by native starch dry-esterification modified with MAH and then blending with PLA had the better interface compatibility than native starch/MAH/PLA composite prepared with MAH as compatibilizer agent. Due to the influence of interfacial compatibility, the melt processing property, tensile strength, bending strength, elongation at break and water resistance of the esterified starch/PLA compo-sites were better than those of the native starch/MAH/PLA composites.
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2017, Vol. 31 
