The Effect of PBAT on the Physical Properties of PLLA Multilayer Structure Film

摘要

Poly(L-lactic acid) (PLLA)/poly(butylene adipate-co- terephthalate) (PBAT) blend films (BF) and five layers co-extruded films (MF) at a variety of compositions were manufactured from the co-extrusion process to evaluate the general physical and equivalent sound level (ESL) properties of both BF and MF. Both films were well produced with the uniform thickness. It was found that the addition of PBAT enhanced the thermal stability, and Tm of PLLA decreased. The mechanical properties such as the tensile strength and modulus revealed the decrease tendency with addition of PBAT due to immiscibility of two polymers, and the elongation at break of PLLA/PBAT BF was significantly increased as compared to that of MF. The energy transfer at interfacial area of multi-layers films under the tensile stress was found to be not efficient as compared to blend samples having matrix-domain internal structure. The addition of PBAT on PLLA had a great effect on the reduction of ESL, and it was suggested that the sound measurement technique used in this study could be utilized as a test tool for assessing the ESL.