水相改質鳳梨葉奈米纖維素補強高分子複合材料之研究

A Study of The Polymer Composites Reinforced by The Nano-Fiber Cellulose of Pineapple Leaf Modified form Aqueous Phase

邱蔓芸(MAN-YUN CHIU)

指導教授 ： 石燕鳳

朝陽科技大學/理工學院/應用化學系/碩士(2017年)

摘要

研究採用改質與未改質鳳梨葉奈米纖維素添加入聚乳酸、聚甲基丙烯酸甲酯基材中，對複合材料整體性能探討與研究。其中鳳梨葉纖維進行TEMPO自由基氧化法來製備出奈米化鳳梨葉纖維(代號OF)，再將纖維以MMA懸浮聚合法進行表面改質得到MMA改質奈米纖維(代號MF)，結果顯示，在添加 1wt%改質奈米纖維其複合材料之拉伸強度提升最佳，提升約14.6％；添加 1wt%改質奈米纖維其複合材料之耐衝擊強度提升最為顯著，提升率為43.1％，熱變形溫度也提升至99.6oC。從DSC分析探討得知，奈米纖維的添加皆可以改變其結晶型態與增快其結晶速率。TGA分析中得知，奈米纖維會先行裂解形成碳層，以保護內部基材分子。SEM分析可以觀察到經由MMA改質可以使奈米纖維與基材間相容性提升。透光性分析觀察到，經改質後的奈米纖維其透光性比未改質高出許多，並且在添加0.5wt％時，其透光性幾乎和基材差不多。結果顯示，改質後的奈米纖維能大大提升基材的機械性質、熱性質、型態分布、透光性，使材料運用範圍更廣範。

關鍵字

聚乳酸 ； 聚甲基丙烯酸甲酯 ； 奈米纖維素 ； 懸浮聚合法 ； 複合材料

並列摘要

Abstract
The modified and unmodified pineapple leaf cellulose nano-fibers (CNF) were added into the polylactic acid (PLA) and polymethyl methacrylate (PMMA) substrate, and the performance of the composites was investigated. CNF was prepared by TEMPO radical oxidation method, and subsequently, it was modified by MMA suspension polymerization method to obtain MMA modified nanofibers (code MF). The results showed that the tensile strength of the composites can be improved about 14.6% when adding 1wt% of MF. The impact strength of composites can be increased about 43.1% when adding 1wt% of MF, and the heat distortion temperature was also raised to 99.6 ℃. The results showed that the addition of CNF can increase the crystallization rate of PLA. TGA analysis showed that the CNF will be decomposed first to form a carbon layer to protect the internal substrate molecules. SEM analysis was observed that MMA modified CNF could improve the compatibility between CNF and substrates. Transmittance analysis revealed that the transmittance of MF containing composites was higher than those of un-modified ones. The transmittance of 0.5 wt% MF containing composites was almost the same as that of the substrate. The results showed that the MMA-modified CNF can greatly enhance the mechanical properties, thermal properties, and light transmittance of the substrate, so that the material can be used in a wider range.

並列關鍵字

Polylactic acid ； Polymethyl methacrylate ； Nano cellulose ； Suspension polymerization ； Composites

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