高含水(ポリビニルアルコール)ゴムの耐水性

概要

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It was shown in our laboratoly that anomalous rubber-like hydrogel is obtained by means of repeated freezing of aqueous solution of poly (vinyl alcohol). Unexpected superior water rsisting properties of the gel are described in this paper : Specimen (1 g of gel containing 80% water, prepared by freezing of six times) was extracted three times with 50 ml of warmed water. No cross linking agents was employed throughout the procedures, nevertheless swelling was not been detected after in water placing over nine years. Solubilities of the gel have been examined according to the official standard testing for medical materials. At a temperature of 37℃, the gel was practically insoluble in aqueous solution of prescribed citric acid and sodium carbonate, and in warm water. Potassium permanganate consumption to the warm extracting water layer remained in the range of 0.5〜0.55 ml, which is far below the restricted value of 2.0 ml.
日本医療機器学会の論文
1989-11-01