Abstract
Poly(lactic acid) (PLA) is an important polymer because of its significant biocompatibility and biodegradability. Supported H3PW12O40 (H3PW) on activated carbon was utilized for the catalytic polymerization of D,L-lactic acid, resulting in blends of PLA. The stability of the polymer was monitored by thermogravimetry (TGA), and the decomposition temperature (Td) was used to determine the optimal production conditions (i.e., temperature of 180 °C for 15 h; 0.1 wt. % catalyst; 20 wt. % H3PW/carbon calcined at 400 °C). The best catalyst was reused three times with good activity and recovery (95 %) and was analyzed to confirm the consistency of its Keggin structure, dispersion, and acidity, which are important parameters that affect the catalyst’s activity. The obtained polymer was characterized by gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FT-IR), 1H/13C nuclear magnetic resonance (NMR) spectroscopy, specific optical rotation ([α]D 25), powder X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The average molar mass of the polymer was 17,400 g mol−1. Blends of poly(lactic acid) with 85 % poly(L-lactic acid) stereospecific isomer were obtained.
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Acknowledgments
We acknowledge Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for research and doctorate scholarships and the financial support provided by Universidade de Brasília/Decanato de Pesquisa e Pós-Graduação/Instituto de Química (UnB/DPP/IQ), Ministério da Ciência, Tecnologia e Inovação/CNPq (MCT/CNPq), CAPES, Fundação de Empreendimentos Científicos e Tecnológicos (FINATEC), Fundação de Amparo a Pesquisa do Distrito Federal (FAPDF), Financiadora de Estudos e Projetos/Fundo de Infraestrutura (FINEP/CTInfra) and PETROBRAS. In addition, we wish to thank Prof. Dr. Nágila M. P. S. Ricardo for the GPC measurements performed at the Max Planck Institute for Polymer Research and Prof. Dr. Inês S. Resck and MSc. Luiz Eduardo C. Benedito for the 1H and 13C NMR measurements performed at Laboratório de Ressonância Magnética Nuclear (LRMN-IQ/UnB).
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Chafran, L.S., Campos, J.M.C., Santos, J.S. et al. Synthesis of poly(lactic acid) by heterogeneous acid catalysis from d,l-lactic acid. J Polym Res 23, 107 (2016). https://doi.org/10.1007/s10965-016-0976-7
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DOI: https://doi.org/10.1007/s10965-016-0976-7