增韌型改質聚乳酸材料之研究

The study of ductile PLA materials

沈家旭(Chia-Hsu Shen)

指導教授 ： 陳伯寬

崑山科技大學/工程學院/材料工程研究所/碩士(2011年)

https://doi.org/10.6828/KSU.2011.00093

摘要

聚乳酸(Polylactic acid)是由百分之百可再生資源如玉米、小麥、甜菜和馬鈴薯等原料所製成，具有無毒、高強度、生物相容與可生物
分解的特性，符合環保訴求，近年來頗被重視。但由於聚乳酸(PLA)本身的物性與機械性質等較差，因此在許多應用受到限制，特別是作為生醫材料。所以本論文著重於增韌性改質聚乳酸的研究，來提升聚乳酸的耐衝擊強度與斷裂伸長率等特性。
故本研究將利用少量的2-Methacryloyloxyethyl isocyanate (MOI)以及Trimethyl-hexamethylene diisocyanate (TMDI)對聚乳酸(PLA)進行增韌改質，並探討耐熱性質及機械性能。實驗結果顯示，聚乳酸與MOI或TMDI共聚改質後皆能增加其韌性，斷裂伸長率與純聚乳酸相較之下整整提升約25倍，最佳可達到52 %，耐衝擊強度也有顯著的提升，從原本的46.3 J/m提升至74.1 J/m，改質後之聚乳酸薄膜以FT-IR、NMR分析其化學結構式，證實所提出的化學反應方程式是正確的，且於分解性分析中得知，改質過後之聚乳酸不僅柔韌性提升，而且有助於聚乳酸更快分解。
改質後聚乳酸的熔融指數(MI)超過100，成功製備出增韌型聚乳酸材料，能應用於生技、紡織等產業界。

關鍵字

聚乳酸 ； 增韌 ； 2-甲基丙烯醯氧乙基異氰酸酯 ； 三甲基己二異氰酸酯

並列摘要

Polylactide (PLA) is biodegradable and has been useful in various biomedical applications. Since the majority of the biodegradable polymers in clinical use are rather stiff materials exhibiting limited extendibility with low elongation at break values, they are unsuitable for use in numerous applications. The physical and mechanical properties of PLA must be improved to allow for more biomedical applications. In order to improve the flexibility and strength of biodegradable PLA, various reaction conditions were studied. Urethane structure polymer materials were prepared; PLA was reacted with a small amount of methacryloyloxyethyl isocyanate (MOI) and/or trimethyl hexamethylene diisocyanate (TMDI) to obtain ductile PLA with markedly improved mechanical properties. Elongation at break can be increased by ~25 times when compared to neat PLA. Impact resistance (notched) improved 1.6 times. Thus, the modified PLA biodegradable polymers may have greater application as a biomedical material with increased mechanical properties.

並列關鍵字

Polylactide acid ； ductile ； 2-Methacryloyloxyethyl isocyanate ； Trimethyl-hexamethylene diisocyanate

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