การเตรียมและสมบัติของเบลนด์ระหว่างพอลิ(แลกติกแอซิด) และพอลิ(บิวทิลีนซักซิเนต) ที่มีพลาสติไซเซอร์ สำหรับใช้เป็นพลาสติกชีวภาพ

Abstract

This research is focused on the properties of polymer blends for use as bioplastics. Polymer blends were prepared from poly (lactic acid) (PLA), poly (butylene succinate) (PBS) and using poly(ester adipate) (Paraplex G40) as a plasticizer. The melt blends were mixed by using high torque overhead stirrer at 180 ๐C and then characterized the thermal property and thermal stability by differential scanning calorimetry and thermogravimetric analysis respectively. All samples were fabricated into thin sheet by compression molding and characterized the fracture surface, the compatibility, mechanical properties, transparency and water vapor permeability. It was found that, as increasing the amount of PBS, the polymer blends show the better thermal stability and no difference in glass transition temperature. From the scanning electron microscope result, it indicates that samples are partially blends and PBS phase disperses in PLA phase. Moreover, the effect of Paraplex G40 as a plasticizer (0 – 15 pph) in polymer blends was also studied. As the Paraplex G40 increases, the glass transition temperature decreases, the crystallization temperature decreases, the thermal stability decreases, the dispersion of PBS in PLA increases, the water vapor permeability is not different, the transparency increases, the stress at break and % elongation at break decreases. However, it was shown that the flexibility increases significantly by adding the plasticizer. From all results, it can be confirmed that the properties of the blends can be controlled by varying the compositions of the blends. In conclusion, it was suggested that the PLA/PBS/Paraplex G40 blends show the potential to be the bioplastics.