Journal of Advanced Chemical Engineering

Processing optimization and characterization for PLA/MgAlCu-LDH/PVP composite microsphere

2^nd World Congress on Biopolymers

August 04-05, 2016 Manchester, UK

Shuhua Zhang, Hongmei Zhang, Yang Chen and Juan Wang

Shanghai University of Engineering Science, China

Posters & Accepted Abstracts: J Adv Chem Eng

Abstract:

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 and MgAlCu-LDH as intercalating agent. Design-Expert 8.5 software was employed to optimize the processing technology in 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%, 800~1200 r/min, respectively. Secondly, the interaction effects of three factors were discussed according to the analysis of the software. The results showed that 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 1200 r/min. The structure and morphology of the dried frozen composite microsphere was characterized by XRD, FT-IR and SEM. The intercalation of part of the PLA into the gap of MgAlCu-LDH was responsible for the new peaks on XRD spectra of MgAlCu-LDH, and the disappearance peaks at 1750 cm-1, 1200 cm-1 assigned to C=O on FT-IR spectra of PLA. This proves that PLA/ MgAlCu-LDH/PVP composite microsphere was successfully prepared. Interestingly, some tiny channels resulted from volatile solvent on the surface of microsphere which may be beneficial for biocompatibility.

Biography :

Email: zhangsh@sues.edu