本研究以熔融插層法藉由混煉機製備聚乳酸/蒙脫土奈米複合材料。以聚氧乙烯山梨糖脂肪酸酯-80 (T80)與二異氰酸異佛爾酮 (IPDI)反應合成插層劑(T80-NH3+)。之後直接將聚乳酸(PLA)、T80-NH3+以及未改質蒙脫土(PK802)用混煉機製備PLA-T80-NH3+-PK802複合材料並與利用改質蒙脫土(Cloisite30B)摻混聚乳酸之複合材料作比較。製備出的複合材料將進行拉力，XRD、TEM、TGA以及DMA的測試，結果發現當PLA加入1 phr Cloisite 30B的含量時，會有塑化的效果，使伸長率上升至208%；以Halpin-Tasi及Mori-Tanaka理論計算得到PLA在加入Cloisite 30B後所得到的蒙脫土片層數為8~15，而此結果是正好符合TEM圖的8~9片；而當PLA直接加入T80-NH3+及PK802各3 phr 的含量時，層間距由純黏土之1.24nm上升至4.93nm，但在加入T80-NH3+及PK802後，高溫會使得T80-NH3+結構上的正電荷與PLA反應而導致裂解；且PK802層間距中所吸附的水層在高溫下也會導致PLA的水解。 In this research, an inorgainic-organic nanocomposite material (PLA /montmorillonite) was prepared by melt intercalation method using a mixer. A kind of modifier called T80-NH3+ was synthesized with Tween80 and IPDI. PLA-T80-NH3+PK802 composites were prepared by pouring PLA、T80-NH3+ and Na+-MMT into a mixer in sequence. Besides, the product will be compared with PLA-C30B-(1 or 3 or 5 or 7phr). By means of some tests, take XRD，TEM、TGA and DMA for example, it was found that the addition of 1 phr Cloisite 30B caused the so-called ‘‘ plasticization effect ’’ which promote the elongation at break to 208%； We could get the numbers of montmorillonite platelet of PLA-Cloisite 30B composites which was calculated by Halpin-Tasi and Mori-Tanaka equations is between eight and fifteen, the result just match the TEM scheme which the numbers of montmorillonite platelet is between eight and nine. The composite of the PLA-T80-NH3+-3-PK802-3 has good ratio of T80-NH3+ to PK802 which result in expansion of the inter-lamellar space from 1.24nm to 4.93nm. A drawback which the structure of T80-NH3+ with the positive charge and the inter-lamellar space of PK802 with water layers lead to the thermal decomposition of PLA appears when the material was prepared.
