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课题组方华高博士在ACS Appl. Mater. Interfaces发表课题组第139篇论文 (ACS Appl. Mater. Interfaces, 2014, 6 (16), 13552–13563)


Supertough Polylactide Materials Prepared through In Situ Reactive Blending with PEG-Based Diacrylate Monomer

Huagao Fang, Feng Jiang, Qianghua Wu, Yunsheng Ding, and Zhigang Wang*

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui Province 230026, P. R. China

Provincial Key Laboratory of Advanced Functional Materials and Devices, Institute of Polymer Materials and Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui Province 230009, P. R. China
ACS Appl. Mater. Interfaces, 2014, 6 (16), pp 13552–13563
DOI: 10.1021/am502735q
Publication Date (Web): August 8, 2014
Copyright © 2014 American Chemical Society
*E-mail: zgwang2@ustc.edu.cn., *Tel.: +86 0551-63607703. Fax: +86 0551-63607703. E-mail: dingys@hfut.edu.cn.


祝贺华高!


志刚等在此感谢期刊编辑和两位审稿人对该研究工作的理解,支持以及提出了宝贵的修稿意见!


Supertough biocompatible and biodegradable polylactide materials were fabricated by applying a novel and facile method involving reactive blending of polylactide (PLA) and poly(ethylene glycol) diacylate (PEGDA) monomer with no addition of exogenous radical initiators. Torque analysis and FT-IR spectra confirm that cross-linking reaction of acylate groups occurs in the melt blending process according to the free radical polymerization mechanism. The results from differential scanning calorimetry, phase contrast optical microscopy and transmission electron microscopy indicate that the in situ polymerization of PEGDA leads to a phase separated morphology with cross-linked PEGDA (CPEGDA) as the dispersed particle phase domains and PLA matrix as the continuous phase, which leads to increasing viscosity and elasticity with increasing CPEGDA content and a rheological percolation CPEGDA content of 15 wt %. Mechanical properties of the PLA materials are improved significantly, for example, exhibiting improvements by a factor of 20 in tensile toughness and a factor of 26 in notched Izod impact strength at the optimum CPEGDA content. The improvement of toughness in PLA/CPEGDA blends is ascribed to the jointly contributions of crazing and shear yielding during deformation. The toughening strategy in fabricating supertoughened PLA materials in this work is accomplished using biocompatible PEG-based polymer as the toughening modifier with no toxic radical initiators involved in the processing, which has a potential for biomedical applications.