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Green Composites of Poly (Lactic Acid) and Sugarcane Bagasse Residues from Bio-refinery Processes |
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| Authors: | Letian Wang Zhaohui Tong Lonnie O Ingram Qingzheng Cheng Siobhan Matthews |
| Institution: | 1. Department of Agriculture and Biological Engineering, IFAS, University of Florida, PO. Box 110570, Gainesville, FL, 32611-0570, USA 2. Department of Microbiology and Cell Science, University of Florida, PO. Box 110700, Gainesville, FL, 32611, USA 3. SCF Processing Ltd., Unit 65a, Boyne Business Park, Drogheda, County Louth, Ireland |
| Abstract: | Twin-screw extrusion was used to prepare the composites consisting of PLA and three types of sugarcane bagasse residues (up to 30 wt%) derived from different steps of a biorefinery process. Each residue had different composition, particle size and surface reactivity due to chemical and biological (enzyme, microbes) treatments that the biomass was subjected to. The effects of different residue characteristics on properties, crystallization behaviors and morphologies of PLA composites were investigated. Besides, a small amount (2 wt%) of coupling agent, Desmodur® VKS 20 (DVKS), was used to improve the interfacial bonding between PLA and bagasse residues. The results indicated that in the presence of 2 % DVKS, PLA composite with pretreated residue exhibited the maximum strength properties (98.94 % tensile strength and 93.91 % flexural strength of neat PLA), while PLA composite with fermentation residue exhibited the minimum strength properties (88.98 % tensile strength and 81.91 % flexural strength of neat PLA). |
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