Effect Of Nano Cellulose Industrial Tea Leaf Fiber On The Physical And Mechanical Properties Of Polylactic Acid (PLA) Composite

Lin, Wei Qi (2019) Effect Of Nano Cellulose Industrial Tea Leaf Fiber On The Physical And Mechanical Properties Of Polylactic Acid (PLA) Composite. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This research is to investigate the yield of nanofibrillated cellulose (NFC) after chemical treatment and fibrillation process of industrial tea leaves (ITL) fibers by centrifugal method, to analyze the distribution and dispersion morphology of NFC in nanofibrillated cellulose reinforced polylactic acid (NFC-PLA) composite by optical microscopy (OM) and scanning electron microscopy (SEM), and to investigate the reinforcing effect of NFC on mechanical properties of NFC-PLA composite by using mechanical testing. Firstly, ITL fibers were fibrillated to nanoscale by chemical treatment and fibrillation process. In fibrillation process, various parameter of blending temperatures were used to get the high yield of nanofibrillated cellulose by centrifugal method. Then, PLA pellet with different volume of nanocellulose fibers underwent hot pressing to form the NFC-PLA composite. Characterization technique of OM and SEM was implemented to study the distribution and dispersion morphology of NFC in NFC-PLA composite. The flexural test was conducted for the NFC-PLA composite to examine its flexural strength and flexural modulus. From this research, the results indicated that the ITL fibers blended at 20℃ with blending speed and time of 23000rpm and 10minutes provides better fibrillated yield (24.19%) than ITL fibers which blended at 0℃ (16.26%) and 80℃ (19.01%) by centrifugation method. The maximum increase in flexural strength of 7.43% and flexural modulus of 55.30% was observed for NFC-PLA composites with fibrillated ITL fiber obtained using blending speed, time and temperature of 23000rpm, 10minutes and 20℃ compared to pure PLA composite. The flexural properties indicated that the strength and modulus were improved with increased nanofiber contents

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