Journal of Industrial and Engineering Chemistry, Vol.13, No.3, 457-464, May, 2007
Thermal Properties and Morphology of Biodegradable PLA/Starch Compatibilized Blends
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Maleic anhydride (MA) and maleated thermoplastic starch (MATPS) are used as reactive compatibilizers to improve interfacial adhesion in preparing PLA/starch blends. The morphological and thermal properties were examined by using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). SEM study revealed that MA is a good compatibilizer, while MATPS is not as effective for PLA/starch blend systems. DSC showed that the PLA/starch blends had increased crystallinity with MA as the reactive compatibilizer. The structural changes of constituents and molecular weight change of PLA were characterized by using fourier transform infrared (FT-IR) spectroscopy and gel permeation chromatography (GPC). MA compatibilized blends showed higher biodegradability than simple PLA/starch blends at the same PLA starch ratio.
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