製備改質聚乳酸奈米複合材料之研究

The study of preparing PLA nanocomposites

施建章(Chien-Chang Shih)

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.2011.00099

摘要

PLA (Poly Lactic acid)具有無毒、生物可分解性與生物可相容性，但熱性質與機械性質較差，所以其應用範圍著實受到限制，而本研究先以MOI (2-Methacryloyloxyethyl Isocyanate)改質PLA，透過矽烷偶合劑之選擇來導入，再經由溶膠-凝膠法（Sol-gel）製成有機／無機奈米混成材料，經FT-IR、29Si-NMR與13C-NMR來確定其反應機構，以TGA、DSC、HDT與MI來觀察改質前後熱性質差別，其Td-10%、Xc與Tm等熱性質，隨silica添加增加成比例上升，而MI值則變小， 再由拉力機與耐衝擊試驗來測試其機械性質，觀察經MOI改質後之韌性增加，而機械強度降低，但添加silica則反之，可透過silica添加量來控制改質後之韌性與機械強度，並由SEM圖觀察得知改質前後，與添加silica後之表面變化情形，其表面結構由MOI改質後變為孔洞狀，添加silica後使其粒子填入孔洞內，造成其韌性、力學性質與結晶性改變，最後利用靜電紡絲來研究奈米纖維紡絲的可行性。

關鍵字

聚乳酸 ； 3. 2-甲基丙烯醯氧乙基異氰酸酯 ； 溶膠-凝膠 ； 奈米複合

並列摘要

PLA are used as biomedical materials because they are biodegradable, but the vast majority of biodegradable polymers in clinical use are composed of rather stiff materials that exhibit limited extendibility, weak mechanical strength and poor thermal stability, they are unsuitable for use in numerous applications. We modified PLA with 2-methacryloyloxy- ethyl isocyanate (MOI) to prepare ductile PLA materials. By utilizing the sol-gel process, novel PLA nanocomposites were further prepared with improved thermal stability and mechanical properties. The 10% thermal decomposition temperature for PLA modified with 5% MOI and contained 5-10% silica is 31-36oC higher than that of original pristine PLA. Elongation at break increases by 5-14 times when compared to neat PLA, while the tensile strength maintained at 30-40 MPa. These synthesized PLA nanocomposites can be applied as biomaterials with better mechanical and thermal properties.

並列關鍵字

PLA ； MOI ； Sol-gel ； nanocomposites

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