抄録
The hydraulic hardened bodies were prepared from the thermal decomposition product of hydroxyapatite with additives such as acrylamide, acrylamide derivatives, and acrylic acid by the simultaneous polymerization of a monomer and hydration of cements. Most of the hardened bodies were composed of calcium deficient hydroxyapatite, tetracalcium phosphate, and polymer. The flexural strength of the hardened bodies with acrylamide was higher than that of the hardened bodies with acrylamide derivatives. The use of a small amount of acrylic acid in addition to acrylamide was more effective than the use of acrylamide alone for improving the mechanical strengths of the hardened bodies. The FT-IR spectra indicated the bonding between the carboxylic units of polymer and the calcium ions of cements in the hardened bodies with acrylic acid and acrylamide. It seemed that the presence of this bonding between the polymer and the inorganic phase strengthened the hardened bodies with acrylic acid and acrylamide compared to those with acrylamide.
