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| 研究生： |
鄒智揮 Chi-Hui Tsou |
|---|---|
| 論文名稱： |
生物全降解型聚乳酸/樹薯澱粉合膠製備 與性能研究 Investigation and Preparation of biodegradable blends of Poly(lactic acid) and tapioca |
| 指導教授： |
顏明雄
Meng-Shung Yen 葉正濤 Jen-Taut Yeh |
| 口試委員: |
林清安
none 石天威 none 芮祥鵬 none |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
| 論文出版年： | 2005 |
| 畢業學年度： | 93 |
| 語文別： | 中文 |
| 論文頁數： | 135 |
| 中文關鍵詞： | 生物可分解 、聚乳酸 、樹薯澱粉 |
| 外文關鍵詞： | Poly(lactic acid), biodegradable, tapioca |
| 相關次數： | 點閱：259 下載：0 |
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論文摘要
本研究使用樹薯澱粉(Tapioca)作為聚乳酸填充物，在斷面觀測中發現聚乳酸與澱粉的界面間產生相分離，因此造成合膠的抗張性質大幅下降。於此吾人使用4,4-二苯基甲烷二異氰酸酯(MDI)作為界面相容劑，成功的改善了界面間的缺陷。在60wt%樹薯澱粉的含量下，可將抗張強度由17.5 MPa提升至42.6 MPa且與純聚乳酸相近。此外，使用己二酸酯(AE)作為聚乳酸之塑化劑以改善其延展性，結果發現合膠樣品在添加了AE塑化劑後其斷點延伸率由數%增加至數百%。但當添加過量AE塑化劑至聚乳酸/樹薯澱粉/4,4-二苯基甲烷二異氰酸酯合膠時，反而會造成樣品產生過分塑性變形，進而導致其抗張強度的下降。 進一步選定較適化配方合膠進行吹膜製品加工，結果發現其成膜特性優良。 為了解上述這些有趣之合膠特性，本研究進一步對上述各合膠樣品之熱學、紅外線光譜、吸水、生物分解及斷面型態等性質進行一系列之研究分析。
Abstract
In this study, granular Tapioca was thermally blended with PLA as a filler. All blends were prepared using a plasti-corder and characterized with tensile properties, thermal properties, thermal dynamic mechanical properties and fracture microstructure
Scanning electron micrographs show that the phase separation occurred in the fracture surface leading to poor tensile properties. Therefore, Methylenediphenyl diisocyanate (MDI) were used as the interfacial compatibilizer to improve the mechanical properties of PLA/Tapioca blends. It is evident that the addition of MDI can improve the tensile strength from 19.8 MPa to 42.6 MPa for the blend with 60 wt% Tapioca. In addition, since PLA was lack toughness for use, adipate ester (AE) was added as a plasticizer to improve the ductility of PLA. Significant decrease in melting point and glass-transition temperature was observed from differential scanning calorimeter and dynamic mechanical analysis. In so doing, the brittleness was improved and the elongation at break was extended to several hundred percents. Therefore, mixing AE with PLA/Tapioca/MDI blends did exhibit effect of plastification. The results also reveal that excessive plasticizer would cause the plastic deformation and decreased the tensile strength.
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