本研究主要於聚乳酸(Poly lactic acid, PLA)內掺混聚酯類共聚物Poly(butylene adipate-co-terethphlate)(PBAT)作為提升聚乳酸吹膜時韌性，並以樹薯澱粉(Tapioca)為填充物，且使用4,4-二苯基甲烷二異氰酸酯(Diphenyl methane 4,4-diisocyanate, MDI)作為PLA與Tapioca界面相容劑。 在抗張性質測試中發現PLAxPBATy共混系列樣品之斷點延伸率會隨著PBAT含量的增加而提高。傅立葉紅外線光譜分析，及斷面形態觀測都發現二苯基甲烷二異氰酸酯(MDI)能夠成功的接枝塑膠基上的-COOH基與澱粉上的-OH基，大大提升共混系列樣品的機械強度。此外，使用己二酸酯（Adipate esters , AE）、三醋酸甘油酯（Triacetine, TAc）作為聚乳酸之塑化劑以改善其延展性，結果發現共混系列樣品在添加了AE或TAc塑化劑後其斷點延伸率由數%增加至數百%，但當添加過量AE或TAc塑化劑至聚乳酸/聚酯類共聚物/樹薯澱粉/4,4-二苯基甲烷二異氰酸酯共混系列樣品時，反而會造成樣品產生過分塑性變形，進而導致其抗張強度的下降。 在一最適化添加量下，所得到塑化後的材料甚至能用於吹膜製品加工。為了解上述這些有趣之共混樣品特性，本研究進一步對上述各共混樣品之熱學、斷面型態、紅外線光譜、吸水性、及生物分解性等性質進行一系列之研究分析。

In this study, we have blended Poly lactic acid (PLA) with Poly(butylene adipate-co-terethphlate)(PBAT) to enhanced the flexibility and toughness of PLA/PBAT resins for film-blowing. All blends were prepared using a plasti-corder and characterized with tensile properties, thermal properties and morphology analysis.
Scanning electron micrographs (SEM) show that the phase separation occurred in the fracture surface leading to poor tensile properties. Therefore, diphenyl methane 4, 4-diisocyanate (MDI) was used as the interfacial compatibilizer to improve the mechanical properties of PLA/PBAT/Tapioca blends. It is evident that the addition of MDI can improve the tensile strength. In addition, since PLA was lack toughness for use, adipate ester (AE) or triacetine (TAc) was added as a plasticizer to improve the ductility of PLA. Significant reduction in melting point (Tm) of the PLA resin was found after adding suitable amounts of AE or TAc. The flexibility and values of elongation at break (εf) of PLA resins were significantly improved after blending suitable amounts of AE or TAc. For instance, f values of more than 280% and 300% were obtained when 10 wt. % of AE and 15 wt. % of TAc were added in PLA resin, respectively. Therefore, mixing AE or TAc with PLA/PBAT/Tapioca/MDI blends did exhibit effect of plasticization. The results also reveal that excessive plasticizer would cause the plastic deformation and decreased the tensile strength.

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