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Synthesis and Characterization of Polylactic Acid (PLA) by Using SSA, CSA and TPA Type Solid Acid Catalyst System in Polycondensation Method

2013; Taylor & Francis; Volume: 50; Issue: 8 Linguagem: Inglês

10.1080/10601325.2013.802157

1520-5738

Bhushan Choubisa, Bharatkumar Z. Dholakiya, Mayank Patel,

Chemical Synthesis and Reactions

Abstract Poly(lactic acid) or PLA was produced by direct condensation polymerization of lactic acid. For the optimization of the reaction conditions, various catalyst systems were examined with constant temperature and different reaction times. In the present study, a solid acid catalyst silica sulfuric acid (SiO2-OSO3H), Keggin type tungstophosphoric acid (H3[PW12O40], and cellulose sulfuric acid was employed as the polycondensation catalyst for the polymerization of lactic acid. Solid acid catalyst SSA and CSA were synthesized and TPA was modified by a calcine process. The prepared PLA was well characterized by using FT-IR, 1H-NMR and 13C-NMR. The thermal characteristics of the polymer have been studied using DSC analyses. The data relevant to the magnitude of the molecular weight were obtained by GPC analysis in terms weight average molecular weight (Mw) and number average molecular weight. Furthermore, the polydispersity index which is a measure of the molecular weight distribution was obtained by GPC. The obtained PLA exhibited a molecular weight of (Mw) 61250 with silica sulfuric acid. Keywords: Poly(lactic acid)catalystpolycondensationmolecular weight Acknowledgments We wish to thank the Department of Applied Chemistry, SVNIT, Surat for providing laboratory facilities and analytical facilities provided by the COE Vapi and SICART, V.V. Nagar Anand.