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Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method

This work aims to develop an effective method for investigating the multistage debinding kinetics and reaction mechanisms of removing N,N-dimethylacrylamide/N,N′-methylenebisacrylamide (DMAA/MBAM) polymer from gelcast ceramic parts. Thermogravimetry (TG) and pyrolysis-gas chromatography/mass spectro...

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Detalles Bibliográficos
Autores principales: Li, Jing, Huang, Jindi, Yin, Ruiming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070656/
https://www.ncbi.nlm.nih.gov/pubmed/35529202
http://dx.doi.org/10.1039/c9ra04489b
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author Li, Jing
Huang, Jindi
Yin, Ruiming
author_facet Li, Jing
Huang, Jindi
Yin, Ruiming
author_sort Li, Jing
collection PubMed
description This work aims to develop an effective method for investigating the multistage debinding kinetics and reaction mechanisms of removing N,N-dimethylacrylamide/N,N′-methylenebisacrylamide (DMAA/MBAM) polymer from gelcast ceramic parts. Thermogravimetry (TG) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to investigate the thermal degradation characteristics and the main compounds produced during the pyrolysis of DMAA/MBAM polymer within green components. A multi-stage parallel reaction model (M-PRM) was proposed to separate the overlapping peaks in the dα/dT curves. The kinetic parameters (activation energy E and pre-exponential factor k(0)) of each substage were calculated using model-free methods (Flynn–Wall–Ozawa, Starink, Friedman and Kissinger–Akahira–Sunose) and an activation energy variable model. In addition, the most appropriate kinetic mechanism function f(α) of each substage was analyzed and discussed via Málek's procedure and the Šesták–Berggren (SB) model. The results showed that the DMAA/MBAM polymer burnout in green components can be divided into three substages through a three-stage parallel reaction model (3-PRM). The values of E (Friedman method) for substages 1 to 3 were E(α) = 139.862 − 110.481α + 156.161α(2) − 88.714α(3) kJ mol(−1), E(α) = 160.791 + 152.496α − 236.906α(2) + 163.724α(3) kJ mol(−1) and E(α) = 72.132 + 452.830α − 669.039α(2) + 507.015α(3) kJ mol(−1), respectively. The average values of E showed an increasing tendency from substages 1 to 3, and a kinetic compensation effect was also observed between the E and k(0) in each substage. The kinetic mechanism analysis revealed that the reaction mechanisms for substages 1 to 3 were f(α) = (1 − α)(0.668)α(3.049)(−ln(1 − α))(−3.874), f(α) = (1 − α)(0.700)α(3.177)(−ln(1 − α))(−3.962) and f(α) = (1 − α)(1.049)α(−0.161)(−ln(1 − α))(0.518), respectively. It is expected that the research results can be extended to investigate the multiplex debinding of binders or polymers for various colloidal molding techniques.
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spelling pubmed-90706562022-05-05 Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method Li, Jing Huang, Jindi Yin, Ruiming RSC Adv Chemistry This work aims to develop an effective method for investigating the multistage debinding kinetics and reaction mechanisms of removing N,N-dimethylacrylamide/N,N′-methylenebisacrylamide (DMAA/MBAM) polymer from gelcast ceramic parts. Thermogravimetry (TG) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to investigate the thermal degradation characteristics and the main compounds produced during the pyrolysis of DMAA/MBAM polymer within green components. A multi-stage parallel reaction model (M-PRM) was proposed to separate the overlapping peaks in the dα/dT curves. The kinetic parameters (activation energy E and pre-exponential factor k(0)) of each substage were calculated using model-free methods (Flynn–Wall–Ozawa, Starink, Friedman and Kissinger–Akahira–Sunose) and an activation energy variable model. In addition, the most appropriate kinetic mechanism function f(α) of each substage was analyzed and discussed via Málek's procedure and the Šesták–Berggren (SB) model. The results showed that the DMAA/MBAM polymer burnout in green components can be divided into three substages through a three-stage parallel reaction model (3-PRM). The values of E (Friedman method) for substages 1 to 3 were E(α) = 139.862 − 110.481α + 156.161α(2) − 88.714α(3) kJ mol(−1), E(α) = 160.791 + 152.496α − 236.906α(2) + 163.724α(3) kJ mol(−1) and E(α) = 72.132 + 452.830α − 669.039α(2) + 507.015α(3) kJ mol(−1), respectively. The average values of E showed an increasing tendency from substages 1 to 3, and a kinetic compensation effect was also observed between the E and k(0) in each substage. The kinetic mechanism analysis revealed that the reaction mechanisms for substages 1 to 3 were f(α) = (1 − α)(0.668)α(3.049)(−ln(1 − α))(−3.874), f(α) = (1 − α)(0.700)α(3.177)(−ln(1 − α))(−3.962) and f(α) = (1 − α)(1.049)α(−0.161)(−ln(1 − α))(0.518), respectively. It is expected that the research results can be extended to investigate the multiplex debinding of binders or polymers for various colloidal molding techniques. The Royal Society of Chemistry 2019-08-30 /pmc/articles/PMC9070656/ /pubmed/35529202 http://dx.doi.org/10.1039/c9ra04489b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Li, Jing
Huang, Jindi
Yin, Ruiming
Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title_full Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title_fullStr Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title_full_unstemmed Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title_short Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
title_sort multistage kinetic analysis of dmaa/mbam polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070656/
https://www.ncbi.nlm.nih.gov/pubmed/35529202
http://dx.doi.org/10.1039/c9ra04489b
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AT yinruiming multistagekineticanalysisofdmaambampolymerremovalfromgelcastceramicpartsusingamultistageparallelreactionmodelandmodelfreemethod