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Enhanced Impact Properties of Polylactide by Poly(lactide-b-butadiene-b-lactide) Triblock Copolymer
진형준,김나연,윤영수,이재윤,찬티가 추초,표혜리,진인주 한국고분자학회 2011 Macromolecular Research Vol.19 No.9
Polylactide (PLA) was copolymerized with polybutadiene (PBD) to improve its impact properties. Triblock copolymers of poly(lactide-b-butadiene-b-lactide) (PLBDL) were obtained by the ring opening polymerization of lactide using tin 2-ethylhexanoate (Sn(Oct)_2) and hydroxyl terminated polybutadiene (HTPBD) as a catalyst and macroinitiator, respectively. PLA and PLBDL were blended at 5, 10, and 15 wt% PLBDL. After blending, the samples exhibited a shift in the T_g of PLA, which means that PLBDL and PLA are compatible. The tensile strength and Young’s modulus decreased with increasing PLBDL. On the other hand, the PLA/PLBDL blend containing 10wt% PLBDL showed a 4 fold increase in impact strength. In addition, the elongation at break of the blend containing 10 wt% PLBDL was 467%, showing a 27 fold increase compared to neat PLA. This suggests that the PBD chains on the PLBDL backbone have a significant effect on the impact properties of PLA.