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

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 f...

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Main Authors: Chun Pei, Peiheng Guo, Ji-Hua Zhu
Format: Article
Language:English
Published: MDPI AG 2020-08-01
Series:Polymers
Subjects:
Online Access:https://www.mdpi.com/2073-4360/12/9/1866
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spelling doaj-25bd2c60a1974a85bf4dcadd1cf5946a2020-11-25T03:52:31ZengMDPI AGPolymers2073-43602020-08-01121866186610.3390/polym12091866Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic AcidChun Pei0Peiheng Guo1Ji-Hua Zhu2Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaGuangdong Province Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaGuangdong Province Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaPreserving 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.https://www.mdpi.com/2073-4360/12/9/1866electrochemical catalysisrecycled carbon fibersorthogonal studydegradation mechanism
collection DOAJ
language English
format Article
sources DOAJ
author Chun Pei
Peiheng Guo
Ji-Hua Zhu
spellingShingle Chun Pei
Peiheng Guo
Ji-Hua Zhu
Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
Polymers
electrochemical catalysis
recycled carbon fibers
orthogonal study
degradation mechanism
author_facet Chun Pei
Peiheng Guo
Ji-Hua Zhu
author_sort Chun Pei
title Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
title_short Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
title_full Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
title_fullStr Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
title_full_unstemmed Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid
title_sort orthogonal experimental analysis and mechanism study on electrochemical catalytic treatment of carbon fiber-reinforced plastics assisted by phosphotungstic acid
publisher MDPI AG
series Polymers
issn 2073-4360
publishDate 2020-08-01
description 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.
topic electrochemical catalysis
recycled carbon fibers
orthogonal study
degradation mechanism
url https://www.mdpi.com/2073-4360/12/9/1866
work_keys_str_mv AT chunpei orthogonalexperimentalanalysisandmechanismstudyonelectrochemicalcatalytictreatmentofcarbonfiberreinforcedplasticsassistedbyphosphotungsticacid
AT peihengguo orthogonalexperimentalanalysisandmechanismstudyonelectrochemicalcatalytictreatmentofcarbonfiberreinforcedplasticsassistedbyphosphotungsticacid
AT jihuazhu orthogonalexperimentalanalysisandmechanismstudyonelectrochemicalcatalytictreatmentofcarbonfiberreinforcedplasticsassistedbyphosphotungsticacid
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