A Study of Microfibrillated Cellulose and Cellulose Reinforced Polylactic Acid Composites

• Main Authors: Chee-Leong Chan, 陳志良
• Other Authors: Yeng-Fong Shih
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/37696884244411616952

碩士 === 朝陽科技大學 === 應用化學系 === 103 === The aim of this study is to compare the influence of mechanical and thermal properties of polylactic acid (PLA) reinforced with different cellulose such as pineapple leaf fiber (PLF) or microfibrillated cellulose (MFC). The MFC was obtained by the TEMPO-mediated oxidation of PLF. Moreover, surface modified pineapple leaf fiber (PLF) or microfibrillated cellulose (MFC) were prepared by modification of PLF or MFC through sol-gel reaction. Finally, a series of green composites were prepared by melt-blending. The results revealed that heat deflection temperature shows an increase of 30.56% with reinforced by 5 wt% of SGC. Besides, tensile strength was increased approximately 31.58% and impact strength was increased about 20.98% with reinforced by 3 wt% of SGLF. The storage and loss modulus of the composites can be enhanced by addition of cellulose effectively. These results showed that cellulose can reinforce the rigidity and toughness of PLA. The compatibility of fiber with PLA can be enhanced by surface modification of the fiber, which can be observed by SEM analysis. Furthermore, the MFC uniformly dispersed in PLA was also found in SEM analysis. In addition, the test of diaphaneity revealed that the composite reinforced by 1 wt% MFC has excellent transparency. These results showed that PLF and MFC can enhance mechanical and thermal properties of PLA. Pineapple leaf fibers are the waste after harvest, therefore it can reduce the costs of the composites. Moreover, the pineapple leaf fibers can be reduced and re-used as utilized as reinforcement in composites.