竹纖維/PLA環保複合材料製備及分析

Preparation and Analysis of Bamboo Fiber/PLA Composites

陳亮宇(Liang-Yu Chen)

指導教授 ： 陳建文

崑山科技大學/工程學院/材料工程研究所/碩士(2011年)

摘要

本研究利用在地生產的綠竹製備竹纖維及改質竹纖維，進而探討竹纖維的各種性質，並與PLA(Polylactide acid)生物可分解塑膠經過雙螺桿壓出機混練，製備成2.5wt%~10wt%的竹纖維/PLA複合材料，探討複合材料之機械性質及熱性質等特性。
本研究添加的纖維分為鹼處理及偶合劑處理，在機械性質方面，僅經過鹼處理竹纖維補強PLA的抗拉強度兩者之間的接著性與相容性不佳，對於抗拉強度並沒有提升的效果；添加經過鹼處理與偶合劑處理過的竹纖維，對於抗拉強度有提升的效果，但是效果不明顯。添加處理後竹纖維之PLA複合材料衝擊強度，隨著纖維添加量的增加而提升，添加改質竹纖維含量在10wt%以上時有較佳的硬度。在熱性質方面，PLA經過一次的加工，分子鏈可能遭到破壞，會使得分子量降低，導致流動性變大，而添加處理後竹纖維對於PLA的熱變形溫度沒有明顯的效果。竹纖維經過偶合劑改質後，能有效的提升PLA的熱裂解溫度。

關鍵字

聚乳酸 ； 竹纖維 ； 偶合劑

並列摘要

In this study the PLA/bamboo-fiber composites were fabricated using twin-screw extruder, and the contents of the bamboo fiber in the PLA matrix would range from 2.5 to 10 wt%. The PLA is known as a bio-degradable polymer and the bamboo fiber is made from the green bamboos in Taiwan. Moreover, the mechanical and thermal properties of the resulting PLA/Bamboo-Fiber will also be investigated. In order to improve the interfacial bonding between the bamboo fiber and PLA matrix the bamboo fiber will be subjected to pretreatments, including alkali and coupling agent treatments. It showed that the bamboo fiber subjected to alkali treatment only would do little improvement on the tensile strength of the resulting PLA/Bamboo-Fiber composites due to the poor interfacial bonding and compatibility. However, the bamboo fiber subjected to both alkali and coupling agent treatments would do a little improvement on the tensile strength of the resulting composites. As for the impact strength, the pretreatment of bamboo fiber could increase the impact strength of the resulting composites with increasing bamboo fiber contents. On the other hand, the bamboo fiber filled PLA composites would exhibit the better performance on hardness as the bamboo fiber content is higher than 10 wt%. Furthermore, the bamboo fiber subjected to alkali treatment only would do little effect on the thermal deformation temperature (HDT) of the resulting composites. However, the bamboo fiber subjected to both alkali and coupling agent treatments would effectively and significantly improve the thermal degradation temperature of the resulting PLA/Bamboo-Fiber composites.

並列關鍵字

PLA ； Bamboo-Fiber ； coupling agent

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