Catalytic Hydrothermal Depolymerization of DGEBA/EDA Epoxy Resin

Zhang, Jian Qiu; Song, Chao; Zu, Jian Hua; Ding, Hong Bo; Deng, Wu Yan

doi:10.4028/www.scientific.net/amr.396-398.1558

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…To conduct a more robust investigation of the depolymerization of DGEBA/EDA epoxy resin during the PA electrochemical catalytic process, the intermediates were identified and the evolution of the major intermediates was investigated. According to GC–MS analysis of the byproducts from the depolymerization of epoxy resin, the intermediate products mainly include phenol, p-isopropyl phenol and bisphenol A (BPA) [ 49 , 50 , 51 ]. Yield curves of phenol, p-isopropyl phenol and BPA produced by the degradation of epoxy resin concerning the reaction time are presented in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

“…The weakly coordinating HPA n− ions coordinated the isolated electron pair of the nitrogen atoms. During the electrochemical process, the now more electrophilic tertiary carbon was attacked, which led to cleavage of the bond between the tertiary carbon and the nitrogen [ 45 , 50 , 59 ] and resulted in the formation of BPA and ethane diamine (see Figure 7 ).…”

Section: Resultsmentioning

confidence: 99%

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Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

2020

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Preserving the integrity of carbon fibers when recycling carbon-fiber-reinforced plastics (CFRPs) has been unfeasible due to the harsh reaction conditions required to remove epoxy resin matrixes, which adversely affect the properties of carbon fibers. We establish a practicable and environmentally friendly reclamation strategy for carbon fibers. Carbon fibers are recycled from waste CFRPs by an electrochemical catalytic reaction with the assistance of phosphotungstic acid (PA), which promotes the depolymerization of diglycidyl ether of bisphenol A/ethylenediamine (DGEBA/EDA) epoxy resin. The removal rate, mechanical strength, and microstructure of the recycled carbon fibers are analyzed to explore the mechanism of the electrochemical treatment. The influence of three factors—current density, PA concentration, and reaction time—are studied via an orthogonal method. Range analysis and variance analysis are conducted to investigate the significance of the factors. The optimal conditions are determined accordingly. The underlying CFRP degradation mechanism is also investigated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

2020

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“…The high temperature air can be output from the hot air export through the thermal convection in the top of the chamber after the heat exchange by jet impact. The air completes the third trips [3,4].…”

Section: Principle and Modelmentioning

confidence: 99%

Intensity Analysis on Heat Transfer of the Jet Plug-in Hot Blast Furnace

Wang

Zhang

et al. 2011

AMR

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This paper primarily focuses on the analysis on temperature, stress and strain distribution of the heat transfer in the jet plug-in hot blast furnace aiming at obtaining the parts of the heat transfer with relatively high heat stress according to the stress and strain distribution. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, the authors can figure out that thermal stress can not be found in the highest temperature part, but in the parts with large temperature difference, and meanwhile this thesis puts forward the reasons causing these situations. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

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“…The chemical bonds C-O bond ((1), (3) ), C-C bond ((2)) the C-N bond ((4)) can be broken during the depolymerization reaction, the products obtained most are phenol, alkylphenols and bisphenol A etc. [5] O C…”

Section: Introductionmentioning

confidence: 99%

Microwave Depolymerization of DGEBA/EDA Epoxy Resin in Ionic Liquid

Zhang

Tian

Zhang

et al. 2014

AMM

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Depolymerization of DGEBA/EDA Epoxy Resin was carried out in a microwave reactor, heated for definitized time. Experimental results showed that the products obtained are phenol, bisphenol A, isopropyl phenol. Liquid products were analyzed by high performance liquid chromatography (HPLC) and the standard curve was established by the pure samples and used it to quantify. The results show that the maximum yields of phenol, bisphenol A, isopropyl phenol are 81%,50%,12%.The residual solid after depolymerization were analyzed by infrared spectroscopy and confirmed that it was residual epoxy resin solid. Depolymerization ratio and yields of main products increase with the increase of reaction temperature and time. The most effective medium is BmimCl and the depolymerization ratio can reach 92%, and the test by infrared spectroscopy shows that BmimCl is stable , It can be used for many times.

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Catalytic Hydrothermal Depolymerization of DGEBA/EDA Epoxy Resin

Cited by 3 publications

References 3 publications

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

Intensity Analysis on Heat Transfer of the Jet Plug-in Hot Blast Furnace

Microwave Depolymerization of DGEBA/EDA Epoxy Resin in Ionic Liquid

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