A hyperbranched hybrid curing agent (CSD) for epoxidized novolac resin (ENR) was ready by grafting silica nanoparticles modified with poly(amidoamine) (PAMAM) dendritic construction (SD) to carbon nanotube (CNT) utilizing an esterification response between the amino practical teams of SD and carboxylic acid functionalities of oxidized CNT. ENR was ready by a response between novolac resin and epichlorohydrin. Curing of ENR was carried out with two totally different contents of CSD because the hyperbranched hybrid curing part of the epoxidized matrix. The amino-rich construction of CSD may end in its excessive dispersion within the ENR matrix and consequently excessive thermal stability of the hybrid composites. Fourier-transform infrared spectroscopy and thermal gravimetric evaluation (TGA) confirmed profitable modification of silica nanoparticles and CNT with the PAMAM dendritic construction and SD, respectively. Construction of the ensuing hybrid curing brokers (SD and CSD) was investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Thermal investigation of the resulted composites by TGA confirmed that the cured ENR with greater content material of CSD has excessive thermal properties with a char residue of 44.four% among the many different hybrid composites.