利用溶膠-凝膠法改質黃麻纖維補強生物可分解綠色複合材料之研究

A study of biodegradable green composites reinforced by sol-gel modified jute fiber

凃曉君(Siao-jyun Tu)

指導教授 ： 石燕鳳

朝陽科技大學/理工學院/應用化學系/碩士(2013年)

摘要

本研究是利用一種新穎的合成方式製備了一系列的溶膠-凝膠法改質黃麻纖維/聚乳酸（PLA）複合材料。其目的是為了能更增進聚乳酸及黃麻纖維之間的相容性，並進一步提升複合材料之耐熱性以及機械性質。在實驗中利用熔融混煉的方式製備出溶膠-凝膠法改質黃麻纖維/生物可分解綠色複合材料，並利用不同的儀器來做化學結構分析、熱性質分析、機械性質分析以及微結構分析，來探討黃麻纖維添加於聚乳酸中的補強效果。由TGA和DSC測試結果得知，黃麻纖維經過溶膠-凝膠法改質後，其熱穩定性可獲得改善，而當純聚乳酸中添加10 wt%的溶膠-凝膠法改質黃麻纖維(TEOS含量為1.5phr)時，熱變形溫度可提升約57.0%。在機械性質部分，拉伸強度、耐衝擊強度最高分別提升約12.3%、26.0%。動態機械性質測試發現儲存模數和損失模數隨著纖維含量以及TEOS含量增加而提升，最高分別可提升約16.2%、16.1%。由實驗結果顯示，經溶膠-凝膠法改質黃麻纖維可使聚乳酸的熱性質以及機械性質具有好的補強效果，還可降低聚乳酸的成本，並使聚乳酸的應用範圍增加。

關鍵字

複合材料 ； 溶膠-凝膠 ； 聚乳酸 ； 黃麻纖維

並列摘要

In this study, a novel synthesis was utilized to prepare a series of sol - gel method modified jute / polylactic acid (PLA) composite. The aim is to improve the compatibility between polylactic acid and jute fiber, and further to enhance the heat resistance and mechanical properties of the composite material. The sol-gel modified jute fiber and PLA were melt blended to prepare the biodegradable green composites. The chemical structure of modified jute fiber, and thermal properties, mechanical properties and microstructure of the composites were investigated. The TGA and DSC results showed that the thermal stability of jute fiber was improved by sol-gel method modified. The heat deflection temperature (HDT) test showed an increase of approximately 57.0% for PLA by adding 10% of fiber (TEOS content is 1.5phr). In addition, the tensile and impact strengths of pristine PLA were increased about 12.3% and 26.0%, respectively. Dynamic mechanical properties tests found that the storage modulus and loss modulus of the composites increased with fiber content as well as the TEOS content, and the increments can reach to approximately 16.2% and 16.1%, respectively. The experimental results show that the addition of sol-gel method modified jute fiber can improve the thermal properties and mechanical properties of polylactic acid. Apart from the reinforcing effect, the incorporation of sol - gel modified jute fiber can reduce the production cost of the materials, and extend the application of polylactic acid.

並列關鍵字

composite ； sol-gel method ； polylactic acid ； jute fiber

參考文獻

4.蕭家銘編著，科學新知週報，第99期 (2010).

9.偉盟工業股份有限公司編著，「PLA簡介」

7.T. H. Erwin Vink, Karl R. Ra’bago, David A. Glassner, Patrick R. Gruber, “Applications of life cycle assessment to NatureWorksTM polylactide (PLA) production,” Polymer Degradation and Stability, 80, 403– 419 (2003).

10.O. Faruka, K. Andrzej Bledzkia, Hans-Peter Fink, M. Sain, “Biocomposites reinforced with natural fibers: 2000–2010, ”Progress in Polymer Science, 37, 1552– 1596 (2012).

11.L. Seung-Hwan Lee, Siqun Wang, “Biodegradable polymers/bamboo fiber biocomposite with bio-based coupling agent, ”Composites Part A: Applied Science and Manufacturing, 37, 80–91 (2006).