Determination of the Composition and Strontium-Binding Ratio of Sodium Titanate Impregnated onto DMAPAA-Grafted Fiber

Sodium titanate was impregnated onto a 6-nylon fiber by means of radiation-induced graft polymerization of dimethylaminopropyl acrylamide （DMAPAA） and subsequent chemical modifications. Peroxotitanium complex anions were bound to the DMAPAA-grafted fiber, followed by a reaction with sodium hydroxide to form sodium titanate as precipitate on the fiber. A quantitative elution of sodium titanate impregnated onto the fiber with 1 M nitric acid revealed that the molar ratio of Na to Ti was 0.76, which was almost consistent with that of sodium titanate （Na4Ti5O12） produced in a homogeneous system. During the immersion of sodium titanate-impregnated fiber in a mixture of 0.5 M NaCl and 0.05 M SrCl2, a molar ion-exchange ratio of Sr with Na was determined as being 0.55 by a quantitative elution of Sr-containing precipitate on the fiber.