| 초록 |
Graft copolymer of poly(butyl acrylate-g-lactide) (PBAL), which was compatible with PLA, was prepared and blended with PLA to improve toughness. Butyl acrylate (BA) was copolymerized with 5% of hydroxyethyl methacrylate (HEMA) to form random copolymer of poly(BA-ran-HEMA). Then, it was reacted with lactide monomer where the hydroxyl group of HEMA acted as macroinitiator in the ring-opening polymerization of lactide to yield PBAL. The content of PLA segments on PBAL chain was 50% by weight. PBAL/PLA blends of various compositions (5/95, 10/90, 15/85 by weight) were prepared by solution blending in chloroform. The elongation at break of the blend containing 15 wt% PBAL was more than 18 times of that of neat PLA. The impact strength of the same blend was doubled and the fracture surface showed more roughness as the PBAL content was increased. Glass transition temperature of the blend was found consistent regardless of the PBAL content. |
