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Generalized kinetics for thermal degradation and melt rheology for poly (lactic acid)/poly (butylene succinate)/functionalized chitosan based reactive nanobiocomposite.
Mulchandani, Neha; Katiyar, Vimal.
Afiliación
  • Monika; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
  • Mulchandani N; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
  • Katiyar V; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India. Electronic address: vkatiyar@iitg.ernet.in.
Int J Biol Macromol ; 141: 831-842, 2019 Dec 01.
Article en En | MEDLINE | ID: mdl-31513852
Systematic kinetics of melt-blended Poly(lactic acid) (PLA)/Poly(butylene succinate) (PBS) and PLA/PBS/functionalized chitosan (FCH) nanobiocomposites with dicumyl peroxide (DCP) and chemical changes thereof at degradation temperatures are evaluated using thermogravimetry (TGA) and thermogravimetry coupled to Fourier transform infrared spectroscopy (TGA-FTIR). A comprehensive kinetic model is employed on above blended samples, including (i) Flynn-Wall-Ozawa, Kissinger, Kissinger-Akahira-Sunose methods to investigate the kinetic and thermodynamic variables, and (ii) Generalized master plots to propose the thermal-induced mechanism. The thermal stability of PLA/PBS reduced with increasing FCH loading up to 3 wt%, and improved for DCP treated PLA/PBS/1FCH at maximum degradation temperature (Tmax) is noticed. The activation energy estimated from Flynn-Wall-Ozawa method are (129-139 kJmol-1), (116-152 kJmol-1), (109-146 kJmol-1), (132-169 kJmol-1) and (120-166 kJmol-1) for PLA/PBS, PLA/PBS/1FCH, PLA/PBS/3FCH, PLA/PBS/1DFCH and PLA/PBS/3DFCH respectively. The generalized master plots depicts that the PLA/PBS blend exhibited L2-F1 mechanism whereas their nanobiocomposite with or without DCP followed L2-Dn and A2-L2-Dn mechanism respectively. Coupled TGA-FTIR highlights the similar kinds of products such as lactide, acetaldehyde, esters, CO2 and CO liberated during the thermal degradation of PLA/PBS blend and their nanobiocomposites. These crosslinked/branched structures are postulated by the rheological behavior which confirmed increase in the complex viscosity (η*) and storage modulus (G') of PLA/PBS/D/1FCH.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Poliésteres / Polímeros / Butileno Glicoles / Quitosano / Nanocompuestos Tipo de estudio: Prognostic_studies Idioma: En Revista: Int J Biol Macromol Año: 2019 Tipo del documento: Article País de afiliación: India Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Poliésteres / Polímeros / Butileno Glicoles / Quitosano / Nanocompuestos Tipo de estudio: Prognostic_studies Idioma: En Revista: Int J Biol Macromol Año: 2019 Tipo del documento: Article País de afiliación: India Pais de publicación: Países Bajos