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|Shuhua Zhang, Hongmei Zhang, Yang Chen, Juan Wang, Xiuxiu Han and Weijun Liu|
|College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, China
College of Mechanical Engineering, Shanghai University of Engineering Science, China
|ScientificTracks Abstracts: J Chem Eng Process Technol|
|In order to improve the mechanical properties of polylactic acid(PLA), PLA/MgAlCu-LDH/polyvinyl pyrrolidone(PVP) composite microsphere was successfully prepared on the basis of seminal emulson polymerization with PLA and PVP as monomer, MgAlCu-LDH as intercalating agent. Design-Expert 8.5 software was employed to optimize the processing technology with two steps. Firstly, single factor was analyzed based on the mass fraction ratio of MgAlCu-LDH to PLA, PVP concentration and stirring speed range being 1/15~1/8, 1~2%, 800~1200r/min, respectively. Secondly, the interaction effects of three factors were discussed according to the analysis of the software. The results show that the influence factors to microspheres size were as follows: the stirring speed > the mass fraction ratio of MgAlCu-LDH to PLA > PVP concentration. The optimized processing technology of microspheres indicates that the mass fraction ratio of MgAlCu-LDH to PLA is 1/15, the concentration of PVP is 2%, the stirring rate is 1200r/min. The structure and morphology of the dried frozen composite microsphere were characterized by XRD, FT-IR and SEM. The intercalation of part of the PLA into the gap of MgAlCu-LDH would be responsible for the new peaks on XRD spectra of MgAlCu-LDH and the disappear peaks at 1750cm-1, 1200cm-1 assigned to C=O on FT-IR spectra of PLA, which proves PLA/ MgAlCu-LDH/PVP composite microsphere was successfully prepared. Interestingly, some tinny channels resulted from volatile solvent on the surface of microsphere may be benefit for biocompatible.|
Shuhua Zhang has completed his PhD from Harbin University of Science and Technology, and visiting studies from Lawrence Berkeley National Laboratory as a senior research scholar from September of 2013~ September of 2014. She is the associate professor of materials in polymer materials and engineering of Shanghai University of Engineering Science now. She has published more than 30 papers, an academic monographs and owned 4 authorized invention patents of China.
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