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Further study on reprocessing feasibility of natural fiber filled polylactic acid composites

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Document pages: 10 pages

Abstract: Polylactic acid (PLA) matrix composites are biodegradable; Disposal after one-time use may be unnecessary and uneconomical. Wasteful treatment of these composites may also cause environmental problems and additional demand for bio based raw materials. In this case, recycling may be an effective solution because it will prolong the service life of composites and prevent the excessive use of natural resources. In this study, the effects of recycling on the mechanical and thermomechanical properties of oak wood powder polylactic acid composites were discussed. Two composite formulations (30 and 50   filler weight percent), each containing 3   prepared a coupling agent (pla-g-ma) by weight percent, and reprocessed six times by extrusion and injection molding. Measurement of fiber length and molecular weightpolymer were, respectively, carried out by gel permeation chromatography (GPC). Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR) tools were used to study morphological and molecular alterations. With consecutive recycling, PLA composites showed a gradual decrease in strength and stiffness properties and an increase in strain properties. The 50 and 30 filler concentration of fibers in the composite showed an abrupt decrease in strength properties after six and two reprocessing cycles, respectively.

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