聚左乳酸-聚乙二醇共聚物/蒙脫土奈米複合材料之合成及其結晶特性之研究

The Synthesis and Crystallization Characteristics of Poly(L-lactic acid)-Polyethylene Glycols Copolymer/Montmorillonite Nanocomposite Materials

10.6623/chem.2012002

黃俊哲(Jiunn-Jer Hwang)；黃素美(Su-Mei Huang)；劉興鑑(Hsin-Jiant Liu)；莊成展(Cheng-Chan Chuang)

聚左乳酸 ； 聚乙二醇 ； 蒙脫土 ； 等溫結晶 ； 結晶速率 ； Poly(L-lactic acid) ； Polyethylene glycols ； Montmorillonite ； Isothermal crystallization ； Crystallization rate

化學

70卷1期（2012 / 03 / 01）

13 - 24

繁體中文

本研究採用熔融聚合法製備聚左乳酸(PLLA)-聚乙二醇(PEG)之生物可分解共聚物，再將此共聚物與親油化改質之蒙脫土進行溶液插層反應，合成一系列聚左乳酸-聚乙二醇/蒙脫土共聚物複合材料，經型態分析顯示出其蒙脫土之層狀微結構已呈現剝離(exfoliation)及插層(intercalation)現象。其PEG分子量愈小，奈米蒙脫土插層及分散現象愈明顯。將此複合材料分別在非等溫及等溫結晶條件下進行DSC測試，在非等溫結晶的升溫實驗結果發現，當添加o-MMT於PLLA-PEG共聚物之後，表示其結晶峰變寬且結晶速度變慢。此外，當添加不同比例o-MMT再經非等溫結晶處理後之熔融熱掃描曲線顯示，隨著o-MMT的含量增加，其熔點(m.p.)逐漸降低。在等溫結晶的測試中發現，增加PLLA-PEG共聚物中的o-MMT含量，將會增加t_(1/2) (crystallization half-time)，同時會降低 ΔHc之值，表示添加o-MMT會影響PLLA-PEG共聚物的結晶速率。

This study used polycondensation to produce Poly(L-lactic acid)-Polyethylene Glycols, a bioactive decomposible copolymer, and then put it with organically modified montmorillonite to go through intercalation reaction to produce a series of nanocomposite material of PLLA-PEG/ o-MMT. Through transmission electron microscopy, the layered structure of this MMT appeared to be exfoliated and intercalated, the less the PEG molecular weight, the more the exfoliation. On the contrary, the crystallization rate is slow and crystallization peak broadening after adding o- MMT in the PLLA-PEG copolymer. Furthermore, adding different proportions of o-MMT of PLLA-PEG copolymer with scanning calorimetry curve of non-isothermal melt crystallization process shows that along with the o-MMT content increased, the melting point gradually decreased. In isothermal crystallization measures found that increasing the PLLA-PEG copolymer in o-MMT content, will increase the t_(1/2) (crystallization half-time) for crystallization, reducing the value of ΔHc that add o-MMT make PLLA-PEG copolymers the crystallization rate of change.