Fully recyclable carbon fiber reinforced vanillin-based epoxy vitrimers. (5th January 2022)

• Record Type: Journal Article
• Authors: Wang, Yuli; Jin, Bihui; Ye, Dezhan; Liu, Zengjin
• Is Part Of: European polymer journal. Volume 162(2022)
• Publication Date: 2022-01-05
• Subjects: Lignin based monomer -- Vanillin -- Epoxy vitrimer -- Carbon fiber recycling -- Thermosetting resin; CF Carbon fiber -- E51 Bisphenyl A epoxy -- VE Vanillin-based epoxy monomer -- DDM 4, 4′-Diaminodiphenylmethane -- DETA Diethylenetriamine -- IPDA Isophoronediamine -- FTIR Fourier transform infrared -- DSC Differential scanning calorimeter -- DMA Dynamic mechanical analysis -- TGA Thermal gravimetric analysis -- SEM Scanning electron microscopy -- SR Swelling ratio -- GF Gel fraction -- Tg The glass transition temperature -- Tp Maximum decomposition temperature -- To Onset decomposition temperature; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2021.110927
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Chemically Recyclable vanillin based epoxy vitrimers were achieved. The mechanical properties were comparable to those of Bisphenol A epoxy/CF composites. Carbon fiber could be recycled at 25 °C for 2 h under 0.1 M HCl/DMF (v/v = 1/1) The surface morphology and chemical structure of carbon fiber are not changed. Abstract: Fabrication of recyclable and reprocessable epoxy vitrimers is opening more application opportunities for carbon fiber (CF) recycling. Despite the extensive study of epoxy thermosets from lignin-based monomer of vanillin, however, few works have been focused on its vitrimers, let alone their mechanical, interfacial, solvent resistance and fully recyclable properties of vanillin-based epoxy vitrimers /CF composite. Here the effect of four types of curing agents on the above properties has been carefully studied. Two-layer CF reinforced vanillin-based epoxy vitrimers composites that was cured with Isophoronediamine shows higher tensile strength at break and Young's Modulus than those of Bisphenyl A epoxy (E51)/CF and other epoxy vitrimers/CF composites, which reaches 571 MPa and 11.7 GPa, respectively. All vanillin-based epoxy vitrimers are easily degradable at room temperature in acid solution except for that cured with 4, 4′-Diaminodiphenylmethane. The surface morphology and chemical structure of CF are not altered after degradation. Importantly, completely recyclable vanillin-based epoxy vitrimers are achieved by imine exchange reaction; however, the mechanical and thermal properties of it are slightly inferior to the origins. This work demonstrates that the mildly degradable, fully recyclable vanillin-based epoxy vitrimers and readily recycling of CF are desirable for the development of lignin based functional materials.