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Amine System

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Xiaoping Yang – 1st expert on this subject based on the ideXlab platform

  • effect of epoxy monomer structure on the curing process and thermo mechanical characteristics of tri functional epoxy Amine Systems a methodology combining atomistic molecular simulation with experimental analyses
    Polymer Chemistry, 2017
    Co-Authors: Qingjie Zhang, Weihong Zhong, Hao Li, Siruo Yu, Xiaoping Yang

    Abstract:

    The curing kinetics and thermo-mechanical characteristics of two kinds of high-performance Amine cured tri-functional epoxy resin compounds, including diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate and N,N-diglycidyl-4-glycidyloxyaniline, were Systematically studied herein. Different to the simple bi-functional epoxy resins studied before, the increase in epoxy functionality and resultant asymmetric monomer structure made the whole curing behaviour more difficult to analyse. Nevertheless, there is an urgent demand to provide a thorough understanding of the tri-functional epoxy resin/Amine System in order to obtain the desired macro-performance. In this paper, a methodology, which combines atomistic molecular simulation with experimental research, was established to expound the effect of the asymmetric epoxy monomer structure on the reaction kinetics and ultimate performance of the tri-functional epoxy/Amine System. It can be utilized to efficiently analyse the cross-linking procedure and the microstructure–property relationships of epoxy resin with poly-functionality and asymmetric monomer structures, thereby serving as guidance to design high-performance polymer matrices for advanced composites.

  • Effect of epoxy monomer structure on the curing process and thermo-mechanical characteristics of tri-functional epoxy/Amine Systems: a methodology combining atomistic molecular simulation with experimental analyses
    Polymer Chemistry, 2017
    Co-Authors: Qingjie Zhang, Weihong Zhong, Hao Li, Siruo Yu, Xiaoping Yang

    Abstract:

    The curing kinetics and thermo-mechanical characteristics of two kinds of high-performance Amine cured tri-functional epoxy resin compounds, including diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate and N,N-diglycidyl-4-glycidyloxyaniline, were Systematically studied herein. Different to the simple bi-functional epoxy resins studied before, the increase in epoxy functionality and resultant asymmetric monomer structure made the whole curing behaviour more difficult to analyse. Nevertheless, there is an urgent demand to provide a thorough understanding of the tri-functional epoxy resin/Amine System in order to obtain the desired macro-performance. In this paper, a methodology, which combines atomistic molecular simulation with experimental research, was established to expound the effect of the asymmetric epoxy monomer structure on the reaction kinetics and ultimate performance of the tri-functional epoxy/Amine System. It can be utilized to efficiently analyse the cross-linking procedure and the microstructure–property relationships of epoxy resin with poly-functionality and asymmetric monomer structures, thereby serving as guidance to design high-performance polymer matrices for advanced composites.

  • dispersion stability of functionalized mwcnt in the epoxy Amine System and its effects on mechanical and interfacial properties of carbon fiber composites
    Materials & Design, 2016
    Co-Authors: Qingjie Zhang, Jianqiao Wu, Weihong Zhong, Guodong Zheng, Wei Fang, Xiaoping Yang

    Abstract:

    Abstract There are many complex interactions between the functionalized multi-walled carbon nanotube (MWCNT) and curing agent/resin molecules, which result in the unstable and unsatisfactory enhancing effects of nanoparticles in epoxy–Amine System as a matrix of carbon fiber composites. In this paper, the surface chemical characteristics of carboxyl-functionalized MWCNT (MWCNT-COOH) and amino-functionalized MWCNT (MWCNT-NH 2 ) were analyzed. The reactivity of MWCNT-COOH and MWCNT-NH 2 in the epoxy matrix before and after adding Amine curing agent was discussed through non-isothermal DSC analyses and micro-morphology observation. The results showed the surface functional groups affected the dispersion stability of MWCNT during the mixing and curing process of the epoxy–Amine matrix. The potential chemical mechanisms behind the improved properties of epoxy resin containing MWCNT were specifically studied. The MWCNT-COOH tended to re-aggregate during the fabrication process of epoxy matrix, whereas MWCNT-NH 2 can maintain the dispersion stability due to the presence of Amine curing agents, which would ensure MWCNT-NH 2 more efficiently participated in the cross-linking reaction of epoxy resin and the interface strengthening between carbon fiber and resin matrix, and then resulting in the improved mechanical performances compared to the carbon fiber composites based on the neat epoxy and MWCNT-COOH reinforced ones.

Paitoon Tontiwachwuthikul – 2nd expert on this subject based on the ideXlab platform

  • 1d nmr analysis of a quaternary mea deab co2 h2o Amine System liquid phase speciation and vapor liquid equilibria at co2 absorption and solvent regeneration conditions
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Abdulaziz Naami, Raphael Idem, Paitoon Tontiwachwuthikul

    Abstract:

    New procedures were developed for our recently developed 1D NMR calibration method for quantitative liquid phase speciation analysis of a complex quaternary CO2 loaded blended Amine solution such as MEA–DEAB–CO2–H2O at high and low temperatures respectively representing CO2 stripping and absorption conditions. The ion speciation analyses were performed in conjunction with the corresponding vapor–liquid equilibrium (VLE) of the System to enable the estimation of possible CO2 capture performance. Accurate speciations were performed for a quaternary Amine System using four concentrations consisting of 5.0 M MEA blended with 0.5, 1.0, 1.5, and 1.25 M DEAB solutions with different CO2 loadings at 24 °C, and for the first time, at higher temperatures using only the NMR calibration method. By comparison, the NMR calibration method with the new procedures was shown to be valid and perhaps the only approach for determining ion speciation for quaternary Amine solutions at higher temperatures.

  • 1D NMR Analysis of a Quaternary MEA–DEAB–CO2–H2O Amine System: Liquid Phase Speciation and Vapor–Liquid Equilibria at CO2 Absorption and Solvent Regeneration Conditions
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Abdulaziz Naami, Raphael Idem, Paitoon Tontiwachwuthikul

    Abstract:

    New procedures were developed for our recently developed 1D NMR calibration method for quantitative liquid phase speciation analysis of a complex quaternary CO2 loaded blended Amine solution such as MEA–DEAB–CO2–H2O at high and low temperatures respectively representing CO2 stripping and absorption conditions. The ion speciation analyses were performed in conjunction with the corresponding vapor–liquid equilibrium (VLE) of the System to enable the estimation of possible CO2 capture performance. Accurate speciations were performed for a quaternary Amine System using four concentrations consisting of 5.0 M MEA blended with 0.5, 1.0, 1.5, and 1.25 M DEAB solutions with different CO2 loadings at 24 °C, and for the first time, at higher temperatures using only the NMR calibration method. By comparison, the NMR calibration method with the new procedures was shown to be valid and perhaps the only approach for determining ion speciation for quaternary Amine solutions at higher temperatures.

Raphael Idem – 3rd expert on this subject based on the ideXlab platform

  • Catalyst performance and experimental validation of a rigorous desorber model for low temperature catalyst-aided desorption of CO2 in single and blended Amine solutions
    Journal of environmental chemical engineering, 2017
    Co-Authors: Benjamin Decardi-nelson, Ananda Akachuku, Priscilla Anima Osei, Wayuta Srisang, Fatemeh Pouryousefi, Raphael Idem

    Abstract:

    Abstract In this study, experimental results of an integrated CO2 capture pilot plant utilizing blended MEA-MDEA solution and two solid acid catalysts (γ-Al2O3 and HZSM-5) in the desorber are presented, and a model developed in-house was validated against the experimental data. The model showed good agreement with the pilot plant data with an absolute average deviation (AAD) of 7.7% for CO2 production rates and could predict well the temperature profiles in the column. The model which has been previously validated against experimental data utilizing MEA and the two solid acid catalysts, was used to predict the performance (in terms of their contribution to the overall reaction rates) of the solid acid catalysts in both solvents (single and blended Amine solutions). The performance results showed that the catalysts contributed more to the process as the temperature and amount of catalyst increased with HZSM-5 yielding as high as 95% increase to the overall rate of reaction in the single Amine System. The results of the performance of the catalysts in the blended solvent were quite low compared to those of the single Amine solution. It was observed that the predicted gas phase CO2 concentration profiles in the desorber, which was not readily available experimentally, was quite high and undesired. Thus, further steps should be taken to address this problem.

  • study of formation of bicarbonate ions in co2 loaded aqueous single 1dma2p and mdea tertiary Amines and blended mea 1dma2p and mea mdea Amines for low heat of regeneration
    Industrial & Engineering Chemistry Research, 2016
    Co-Authors: Rui Zhang, Zhiwu Liang, Raphael Idem, Helei Liu, Wichitpan Rongwong, Xiao Luo, Qi Yang

    Abstract:

    The formation of bicarbonate ions in an Amine solution during CO2 absorption results in lowering the heat duty for Amine solvent regeneration in the CO2 capture process because bicarbonate breakdown needs the lowest energy input to release CO2. In this study, bicarbonate formation was conducted for two mixed solvents consisting of tertiary Amines (1DMA2P (1 M) or MDEA (1 M)) blended with MEA in order to determine both formation rate and capacity of bicarbonate ions as compared to MEA alone. The Amines and concentrations used in the study were MEA (5 M), MEA–MDEA (5:1 molar ratio, 6 M total), and MEA–1DMA2P (5:1 molar ratio, 6 M total) at various CO2 loadings. The formation of bicarbonate ions was evaluated using 13C NMR technique at 293.15 K. The results show that for the single tertiary Amine System higher concentrations of bicarbonate ions were formed for MDEA than for 1DMA2P for the same CO2 loading. The results for the blended Amine Systems showed that bicarbonate ions were generated at CO2 loadings l…

  • 1d nmr analysis of a quaternary mea deab co2 h2o Amine System liquid phase speciation and vapor liquid equilibria at co2 absorption and solvent regeneration conditions
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Abdulaziz Naami, Raphael Idem, Paitoon Tontiwachwuthikul

    Abstract:

    New procedures were developed for our recently developed 1D NMR calibration method for quantitative liquid phase speciation analysis of a complex quaternary CO2 loaded blended Amine solution such as MEA–DEAB–CO2–H2O at high and low temperatures respectively representing CO2 stripping and absorption conditions. The ion speciation analyses were performed in conjunction with the corresponding vapor–liquid equilibrium (VLE) of the System to enable the estimation of possible CO2 capture performance. Accurate speciations were performed for a quaternary Amine System using four concentrations consisting of 5.0 M MEA blended with 0.5, 1.0, 1.5, and 1.25 M DEAB solutions with different CO2 loadings at 24 °C, and for the first time, at higher temperatures using only the NMR calibration method. By comparison, the NMR calibration method with the new procedures was shown to be valid and perhaps the only approach for determining ion speciation for quaternary Amine solutions at higher temperatures.