Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10116
標題: Crystallization Behavior and Physical Properties of Poly(lactic acid)/Modified Mica Nanocomposites
聚乳酸/改質雲母奈米複合材料之結晶行為與物性研究
作者: Yeh, Yen-Tsen
葉晏岑
關鍵字: Polylactic acid
聚乳酸
Nano mica
biodegradability
奈米雲母
生物可分解材料
出版社: 材料科學與工程學系所
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摘要: 本研究利用熔融混煉法來製備聚乳酸(Poly(lactic acid),PLA)/乙烯基改質雲母(Vinyl Modified Mica)奈米複合材料。研究中也藉由添加過氧化二異丙苯(Dicumyl peroxide,DCP)於PLA/Vinyl Modified Mica奈米複合材料中,來探討奈米複合材料之結晶行為、物性研究與生物崩解度試驗。 經由傅立葉轉換紅外線光譜儀(FT-IR)與熱重分析儀(TGA)進行分析,證實Nano Mica已成功被改質為Vinyl Modified Nano Mica。有機改質劑Vinyl佔整個Vinyl Modified Nano Mica中重量百分比約9.7wt %。由穿透式電子顯微鏡(TEM)所得結果顯示,添加DCP於奈米複合材料中,可使Vinyl Modified Nano Mica於PLA基材中有良好的分散性。 在PLA高分子結晶行為與動力學探討方面,以示差掃描式熱分析儀(DSC)進行分析。在非等溫熔融結晶結果方面,添加3wt% Vinyl Modified Nano Mica與3wt% Vinyl Modified Nano Mica+0.03 wt% DCP於PLA基材中可增加異質成核進而促進結晶成長,使材料的結晶速率增加,結晶活化能下降。而在添加更高含量的Vinyl Modified Nano Mica與Vinyl Modified Nano Mica+DCP時,雖然可增加高分子異質成核的產生,但較多的Vinyl Modified Nano Mica與Vinyl Modified Nano Mica+DCP存在可能使得高分子鏈的擴散上造成較多的空間限制,造成PLA高分子的分子鏈傳輸能力下降,而使結晶成長速率降低,結晶活化能增加。 機械性質方面,結果顯示奈米複合材料的抗彎模數、儲存模數與硬度皆會隨Vinyl Modified Nano Mica的添加變硬而上升,且添加DCP於奈米複合材料中的機械性質優於未添加DCP於奈米複合材料中。熱性質方面,得知隨著Vinyl Modified Nano Mica添加量增加,耐熱性提升,且添加DCP於奈米複合材料中,耐熱性提升效果更顯著。崩解度方面,添加DCP與未添加DCP於奈米複合材料中,崩解度皆有明顯的變化,表示當添加DCP於奈米複合材料中,PLA高分子本身並無產生交聯反應。
Poly(lactic acid)(PLA)/vinyl modified mica nanocomposites with dicumyl peroxide(DCP)have been prepared using melting compounding process. The crystallization behaviors, physical properties and disintegration test of nanocomposites will be discussed. From FT-IR and TGA data, it was suggested that the mica has been successfully modified using organic vinyl group. The TEM images of nanocomposites indicate that the vinyl modified mica was well dispersed into PLA matrix with the addition od DCP. The nonisothermal crystallization behavior of PLA/vinyl modified mica nanocomposites showed that the addition of 3wt% vinyl modified mica into PLA matrix could induce more heterogeneous nucleation to speed up the crystallization rate and to reduce their activation energy. By adding more mica into PLA probably caused more steric hindrance to reduce the transportation ability of polymer chains during crystallization, thus reduce the crystallization rate and increase the activation energy. The mechanical and thermal properties of nanocomposites with DCP revealed significant enhancement as compared to the nanocomposites without DCP. The disintegration test of nanocomposites showed remarkable weight loss of nanocomposites with DCP, suggesting the addition of DCP did not destroy the degradation behavior of PLA/vinyl modified mica nanocomposites.
URI: http://hdl.handle.net/11455/10116
其他識別: U0005-0802201216411900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0802201216411900
Appears in Collections:材料科學與工程學系

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