Abstract
To prepare poly(lactic acid) (PLA) with improved mechanical properties, high-molecular-weight poly(L-lactic acid) (PLLA) was synthesized by the direct polycondensation of lactic acid in solution phase. During polymerization, the molecular weight of PLA was influenced by the water content present in the solution; thus, the experimental apparatus was designed to remove the water efficiently and this study was focused on the optimization of the polymerization conditions such as polymerization time, solvent, and kinds of catalyst, etc. Additionally, to search for a good catalyst in the polymerization, the mixed oxide catalysts were synthesized by sol–gel method and it was characterized by XRD and BET. The results show that the Mv of PLA obtained was about 33 000, when 0.2 wt.-% of SnCl2 · 2H2O was used as a catalyst in the polymerization. The DSC study shows that the thermal properties of PLA such as Tg and Tm were influenced by the kind of solvent as well as the molecular weight of PLA. The effect of various kinds of stannous compounds on the molecular weight of PLA synthesized in solution polymerization with molecular sieve.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
