화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.24, No.6, 515-521, June, 2016
DOI10.1007/s13233-016-4071-z  Export Citation
Toughening effect of annealing-induced intermolecular crystallization of PBA-g-PLLA in PLA matrix
Hanna Lee, and In-Joo Chin†
  • Department of Polymer Science and Engineering, Inha University, Incheon, 22212, Korea
E-mail:
The intermolecular interaction between polylactide (PLA) and the impact modifier can generate high impact energy dissipation upon fracture. In this study graft copolymer impact modifiers that were composed of poly(n-butyl acrylate) (PBA) on the main chain and crystalline poly(L-lactide) (PLLA) on the side chain were prepared to investigate the intermolecular crystallization between the PLLA moiety and the PLA matrix. L-Lactide or D,L-lactide was graft copolymerized with PBA to yield either crystalline poly(n-butyl acrylate-g-L-lactide) (PBGL) or amorphous poly(n-butyl acrylate-g-D,L-lactide) (PBGDL). PBGL/PLA blend and PBGDL/PLA blend were prepared in the melt state, while the PBA content of each blend was fixed at 10 wt%. Annealing of the blends was performed at 100 oC for 4 h to modify the degree of crystallinity. The degree of crystallinity in all blends and neat PLA was increased by about 20% after annealing. The impact strength of the annealed PBGL/PLA blend was twice of that of the unannealed PBGL/PLA blend. However, the impact strengths of the PBGDL/PLA blend was not affected upon annealing, while annealing caused 10% reduction in impact strength of neat PLA and the PBA/PLA blend. The impact strength of the PBGL/PLA blend was found to be improved due to the intermolecular crystallization, resulting in expanded cavitation, debonding, shear yielding and fibrillar structure during fracturing.
Keywords:poly(lactic acid) (PLA);impact modifier;annealing;intermolecular crystallization;izod impact test
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