Enhancement of Bagasse Cellulose-Poly(Lactic Acid) Interaction Using Poly(Ethylene Glycol) Chain Extender
Keywords:
transesterification, biodegradable packaging, biocomposite, structural modificationAbstract
Sugar cane bagasse pulp is one ofthe most abundant natural cellulose fiber available as by-product from sugar industries of Thailand. The bagasse fiber, not only renewable but also biodegradable, provides a huge potential in reinforcement of bioplastic such as poly(lactic acid) (PLA) to be used for biodegradable food packaging. However, direct biocomposite fabrication using melt mixing process requires high blending temperature and massive amount of torque due to difference in polarity of the two components. In this study, trans-esterification between PLA and poly(ethylene glycol) (PEG) has been proved possible in both melt-mixing and compression moulding processes at 180 oC for 10 minutes as well as in the compression mouldingof bleached bagasse pulp (BBP) partially pre-coated with PEG and PLA. In addition, the obtained copolymer PLA-b-PEG showed high improved of reinforcement in the BBP/PLA/PEG composite when PEG content is 10-20% by weight and BBP content not more than 5-10%were used.
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