Poly[(methyl methacrylate)-co-acrylamide] of various compositions were previously prepared by the radical copolymerization reaction of methyl methacrylate and the acrylamide monomer in a solvent. The copolymers were modified through a resonating salt by the addition reaction of a chlorotitanium-triisopropoxide-, the modified resins are called Ti hybrid copolymers. The chemical structure of acrylamide side chain groups in the Ti hybrid copolymers was confirmed by the ash weight after combustion, the characteristic absorption band determined by Fourier transform infrared spectrophotometry (IR) and elementary analysis (EA). The curing temperature and time of the resins were determined from the change in the insoluble resin weight when the extraction was done with a mixture of acetone and methanol using the curing resin samples. The thermal stability of the Ti hybrid copolymers was evaluated using both the thermal-degradation temperature (T-x) measured by thermogravimetric analysis and the thermal degradation at 130 degreesC for 720 h. The cured resins improved the weight loss of the resins at the T-x, and exhibited a high thermal stability.