Journal
JOURNAL OF POLYMER RESEARCH
Volume 23, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/s10965-016-0976-7
Keywords
Stereo polymerization of D,L-lactic acid; Blends of poly(lactic acid); Supported 12-tungstophosphoric acid on activated carbon; Poly(lactic acid)
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Universidade de Brasilia/Decanato de Pesquisa e Pos-Graduacao/Instituto de Quimica (UnB/DPP/IQ)
- Ministerio da Ciencia, Tecnologia e Inovacao/CNPq (MCT/CNPq)
- CAPES
- Fundacao de Empreendimentos Cientificos e Tecnologicos (FINATEC)
- Fundacao de Amparo a Pesquisa do Distrito Federal (FAPDF)
- Financiadora de Estudos e Projetos/Fundo de Infraestrutura (FINEP/CTInfra)
- PETROBRAS
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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 (T-d) was used to determine the optimal production conditions (i.e., temperature of 180 degrees C for 15 h; 0.1 wt. % catalyst; 20 wt. % H3PW/carbon calcined at 400 degrees 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), H-1/C-13 nuclear magnetic resonance (NMR) spectroscopy, specific optical rotation ([alpha](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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