Fast chemical recycling of carbon fiber reinforced plastic at ambient pressure using an aqueous solvent accelerated by a surfactant. (December 2020)

• Record Type: Journal Article
• Authors: Lee, Miyeon; Kim, Doo Hun; Park, Jong-Jin; You, Nam-Ho; Goh, Munju
• Is Part Of: Waste management. Volume 118(2020)
• Page Start: 190
• Page End: 196
• Publication Date: 2020-12
• Subjects: Carbon fiber reinforced plastics -- Thermoset resin -- Carbon fiber -- Epoxy resin -- Chemical depolymerization; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2020.08.014
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: CFRP was recycled by using oxidative hydroxyl radicals generated in aqueous solution of NaOCl. Chemical recycling efficiency was greatly improved through the use with surfactant. There were few defects on the surface of the recovered carbon fiber, and it showed excellent quality. It will improve the sustainability of CFRP through eco-friendly recycling method using water. Abstract: The properties of infusibility and insolubility in organic solvent of cured epoxy resin makes it difficult to recycle carbon fiber reinforced plastics (CFRP). We have reported the recycling of CFRPs using the oxidizing power of hydroxyl radicals generated from NaOCl solution. In our study, we used benzyltrimethylammonium bromide (BTAB) and sodium dodecyl sulfate (SDS) for the interfacial separation between the epoxy resin and carbon fibers (CF). The surfactant system maximized recycling efficiency in both pretreatment and the main reaction of the CFRP recycling process. In the second step, the reaction time to successfully reclaim the CFs was much shorter, only one hour, compared with the two-hour reaction time for the non-SDS process previously reported by us. Scanning electron microscope images and Raman analyses showed that the surface of the reclaimed CF (r-CFs) was clean and smooth without any defects, and there was no significant structural change compared to virgin CF (v-CFs). The tensile strength of r-CF was 3.42 GPa which is 96.9% of the v-CF. Thus, the CFRP recycling process using SDS not only results in r-CF with good mechanical and physical properties, but also increases recycling efficiency by reducing the time.