@article {49795,
	title = {Vanillin-based recyclable thermosets and their glass fiber reinforced composites},
	journal = {Macromolecular Chemistry and Physics},
	volume = {227},
	year = {2026},
	month = {JAN},
	type = {Article},
	abstract = {<p>
	The accumulation of end-of-life plastic materials and composite reinforcement waste materials has brought much attention to developing sustainable alternatives and their re-processability. Incorporating covalent adaptable networks (CANs) into the crosslinked network bridges the concept of reversibility into the otherwise conventional non-reversible networks. This study investigates the structure-property relation in two reversible hardener systems derived from vanillin using Schiff base chemistry. The {\textquoteleft}{\textquoteleft}CAN{\textquoteright}{\textquoteright} systems were synthesized by condensation of vanillin with two amines, 4,4{\textquoteright}-oxydianiline and tris(2-aminoethyl)amine, respectively, to form Va_ODA and Va_TAEA. The epoxy thermosets exhibited glass transition temperatures (T-g) of 125 degrees C and 115 degrees C, respectively, for Va_ODA and Va_TAEA, which is superior to most reversible vanillin-based systems reported. The vitrimer-thermosets exhibited promising mechanical and thermal properties, and reshaping abilities as a function of applied temperatures, indicating the dynamic nature of linkages. Chemical degradability was demonstrated by heating to 80 degrees C for 12 h in aqueous acidic medium or excess amine. The fabricated glass fiber composites exhibited good mechanical properties with tensile strength of 361 MPa and degradability in acetic acid/water mixture with a fiber recovery of \&gt;98 \%. The recovered glass fiber exhibited almost similar tensile strength as the virgin glass fiber, demonstrating its potential reusability. The epoxy vitrimers underwent mechanical reprocessing through hot-pressing, as well as chemical reprocessing via 3D printing and by regeneration of imine bonds to form an epoxy resin.</p>
},
	keywords = {3D printing, covalent adaptable network, re-processability, Schiff base, Vanillin},
	issn = {1022-1352},
	doi = {10.1002/macp.202500420},
	author = {Veetil, Ashwani Puthiya and Ravikumar, Aniruddha and Rajput, Tejas and Singh, Aman Kumar and Thakur, Tamanna and Krishna, Abhijith and Pol, Harshawardhan and Shanmuganathan, Kadhiravan and Asha, S. K.}
}
