Crystallization behavior,rheology, mechanical properties,and enzymatic degradation of poly(L-lactide)/poly(D-lactide)/glycidyl methacrylate grafted poly(ethylene octane) blends |
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| Authors: | Xiangyu Yan Yan Zhao Yanping Hao Hongwei Pan Huiliang Zhang Zhe Wang Lisong Dong |
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| Institution: | 1.Key Laboratory of Polymer Ecomaterials,Chinese Academy of Sciences, Changchun Institute of Applied Chemistry,Changchun,P. R. China;2.Synthetic Resins and Special Fiber Engineering Research Center, Ministry of Education,Changchun University of Technology,Changchun,P. R. China;3.State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Laboratory of Advanced Materials,Fudan University,Shanghai,P. R. China |
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| Abstract: | Poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA)/poly(ethylene octene) grafted with glycidyl methacrylate (GPOE) were prepared by simple melt blending method at PDLA loadings from 1 to 5 wt%. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) demonstrated the formation of the stereocomplex in the blends. The addition of PDLA led to the increase of nucleation density from polarized microscope (POM) observations. Rheological measurements indicated that the blends exhibited a rheological fluid-solid transition and an enhanced elastic behavior in that ternary system as the PDLA loadings reached up to 5 wt%. By adding 1-2 wt% PDLA, the ternary system has better tensile and impact properties. Dynamic Mechanical Analysis (DMA) results showed that SC crystal formation and its effect on the enhancement of thermal stability at higher temperature. It is interesting that the enzymatic degradation rates have been enhanced clearly in the PLLA/PDLA/GPOE blends than in the PLLA/GPOE blend, which may be of great use and significance for the wider practical application of PLLA/GPOE blends. |
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