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Thermal degradation behaviour and crystallization kinetics of poly (lactic acid) and cellulose nanocrystals (CNC) based microcellular composite foams.
Int J Biol Macromol. 2018 Oct 15; 118(Pt B):1518-1531.IJ

Abstract

The current investigation addresses the thermal degradation and non-isothermal crystallization behaviour of the fabricated poly (lactic acid) foam (nPLA) and poly (lactic acid) (PLA)/cellulose nanocrystal (CNC) based foams at three different loadings of CNC (i.e. 1%, 2% and 3%) as PLA/CNC 1, PLA/CNC 2 and PLA/CNC 3 having highly porous, interconnected and microcellular morphology. The formation of various gaseous products at two different conversions (α = 0.3 and α = 0.7) are investigated by using thermogravimetric analyser hyphenated Fourier transmission infrared spectroscopy (TGA-FTIR) analysis in isothermal condition. Effect of porosity and CNC reinforcement towards thermal degradation and crystallization of the PLA is thoroughly investigated by using mercury intrusion porosimetry (MIP). "Model-free" and "modelistic" approaches like Friedman, Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sinouse (KAS), Kissinger and Augis & Bennet have been utilized for non-isothermal degradation kinetics of the fabricated foams. Non-isothermal melt crystallization kinetics of fabricated foams reveals that both primary and secondary crystallization process taking place. The apparent activation energy calculated from FWO are ~175.8 kJ/mol, ~198.6 kJ/mol, ~175.5 kJ/mol and ~174.7 kJ/mol for nPLA, PLA/CNC 1, PLA/CNC 2 and PLA/CNC 3 respectively. It is also observed that at higher conversions, complex three dimensional diffusion mechanism of degradation might be taking place in accordance with Criado plots.

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Authors+Show Affiliations

Borkotoky SS
Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
Chakraborty G
Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
Katiyar V
Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India. Electronic address: vkatiyar@iitg.ernet.in.

MeSH

CelluloseCrystallizationKineticsNanoparticlesPolyestersPorosityTemperature

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29981330

Citation

Borkotoky, Shasanka Sekhar, et al. "Thermal Degradation Behaviour and Crystallization Kinetics of Poly (lactic Acid) and Cellulose Nanocrystals (CNC) Based Microcellular Composite Foams." International Journal of Biological Macromolecules, vol. 118, no. Pt B, 2018, pp. 1518-1531.
Borkotoky SS, Chakraborty G, Katiyar V. Thermal degradation behaviour and crystallization kinetics of poly (lactic acid) and cellulose nanocrystals (CNC) based microcellular composite foams. Int J Biol Macromol. 2018;118(Pt B):1518-1531.
Borkotoky, S. S., Chakraborty, G., & Katiyar, V. (2018). Thermal degradation behaviour and crystallization kinetics of poly (lactic acid) and cellulose nanocrystals (CNC) based microcellular composite foams. International Journal of Biological Macromolecules, 118(Pt B), 1518-1531. https://doi.org/10.1016/j.ijbiomac.2018.06.202
Borkotoky SS, Chakraborty G, Katiyar V. Thermal Degradation Behaviour and Crystallization Kinetics of Poly (lactic Acid) and Cellulose Nanocrystals (CNC) Based Microcellular Composite Foams. Int J Biol Macromol. 2018 Oct 15;118(Pt B):1518-1531. PubMed PMID: 29981330.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Thermal degradation behaviour and crystallization kinetics of poly (lactic acid) and cellulose nanocrystals (CNC) based microcellular composite foams. AU - Borkotoky,Shasanka Sekhar, AU - Chakraborty,Gourhari, AU - Katiyar,Vimal, Y1 - 2018/07/05/ PY - 2018/04/10/received PY - 2018/06/28/revised PY - 2018/06/30/accepted PY - 2018/7/8/pubmed PY - 2018/11/22/medline PY - 2018/7/8/entrez KW - Cellulose nanocrystals (CNC) KW - Foam KW - Poly (lactic acid) (PLA) SP - 1518 EP - 1531 JF - International journal of biological macromolecules JO - Int J Biol Macromol VL - 118 IS - Pt B N2 - The current investigation addresses the thermal degradation and non-isothermal crystallization behaviour of the fabricated poly (lactic acid) foam (nPLA) and poly (lactic acid) (PLA)/cellulose nanocrystal (CNC) based foams at three different loadings of CNC (i.e. 1%, 2% and 3%) as PLA/CNC 1, PLA/CNC 2 and PLA/CNC 3 having highly porous, interconnected and microcellular morphology. The formation of various gaseous products at two different conversions (α = 0.3 and α = 0.7) are investigated by using thermogravimetric analyser hyphenated Fourier transmission infrared spectroscopy (TGA-FTIR) analysis in isothermal condition. Effect of porosity and CNC reinforcement towards thermal degradation and crystallization of the PLA is thoroughly investigated by using mercury intrusion porosimetry (MIP). "Model-free" and "modelistic" approaches like Friedman, Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sinouse (KAS), Kissinger and Augis & Bennet have been utilized for non-isothermal degradation kinetics of the fabricated foams. Non-isothermal melt crystallization kinetics of fabricated foams reveals that both primary and secondary crystallization process taking place. The apparent activation energy calculated from FWO are ~175.8 kJ/mol, ~198.6 kJ/mol, ~175.5 kJ/mol and ~174.7 kJ/mol for nPLA, PLA/CNC 1, PLA/CNC 2 and PLA/CNC 3 respectively. It is also observed that at higher conversions, complex three dimensional diffusion mechanism of degradation might be taking place in accordance with Criado plots. SN - 1879-0003 UR - https://www.unboundmedicine.com/medline/citation/29981330/Thermal_degradation_behaviour_and_crystallization_kinetics_of_poly__lactic_acid__and_cellulose_nanocrystals__CNC__based_microcellular_composite_foams_ DB - PRIME DP - Unbound Medicine ER -