Synthesis and characterization of polylactic acid (PLA) using a solid acid catalyst system in the polycondensation method
In this study, synthesis of poly(l(+) lactic acid) was carried out by using an acid catalyst. Neat chlorosulfonic acid reacts with cellulose to give cellulose sulfuric acid in which sulfuric acid is immobilized on the cellulose surface via bond formation. Cellulose sulfuric acid was used as a catalyst in a quantity of 1.0 wt.% calculated on the monomer. Polycondensation was carried out over a period of 24 h. The resulting poly(l(+) lactic acid) was characterized by Fourier-transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) thermogravimetric analysis (TGA), 1H and 13C nuclear magnetic resonance (NMR), and gel permeation chromatography. The molecular weight of poly(l-lactic acid) reached as high as 14,875.
KeywordsPoly(lactic acid) Catalyst Polycondensation Cellulose sulfuric acid
We wish to thank the Department of Applied Chemistry, SVNIT, Surat for providing laboratory facilities and analytical facilities providing by the COE vapi and SICART, V.V. Nagar Anand.