Catalyst-free liquid crystal epoxy vitrimer based on dynamic covalent bonding of ester and imine with high thermal conductivity.
발표자
()
초록
내용
Highly attractive for diverse industrial and technological applications, liquid crystal epoxy vitrimers (LCEVs) possess excellent mechanical strength, high thermal conductivity (TC), and self-healing capability. However, a major drawback in most LCEVs is their reliance on external catalysts for reprocessing, often toxic, unstable, and insoluble in the matrix, causing substrate corrosion and poor water resistance. To address this issue, we successfully developed three free-catalyst liquid crystal epoxy vitrimers with an impressive TC of 0.64 W/mK, three times higher than conventional epoxy at 0.2 W/mK. Fabrication involved curing aromatic diamine and monomer with mesogen, forming dynamic covalent bonds of imine and ester. This unique composition enables reprocessing and recycling through transesterification and imine metathesis. Remarkably, the reprocessed and recycled products retain identical properties to the original cured compounds across multiple cycles.