A study in the design for comfortable diaper made of functional gel materials

本研究的目的是开发一种功能性凝胶材料的纸尿裤，特别适合高龄人群使用。将水凝胶膜用作尿布的模型。用戊二醛和一些疏水醛对聚乙烯醇进行不溶处理，制备了凝胶膜。测定凝胶膜的盐吸附量和盐渗透率，并通过差示扫描量热计研究膜中水的状态。疏水醛类不增溶凝胶膜的冻结水是戊二醛交联凝胶膜的2-4倍，醛类的引入对凝胶膜的盐吸附行为有很大的影响，尤其是对强水合离子组成的盐。研究中提出的“两态模型”定量解释了土壤对盐分的吸附量。在模型中，它被假定为冻结和非冻结沃茨表示不同的溶解度的盐。这些结果被解释的聚合物和盐之间的相互作用。这些结果被解释在聚合物和离子之间的相互作用，通过水合层。发现如上所述的特定相互作用对于设计用于适合于高龄的尿布的功能性凝胶材料是重要的。

The object of this study is to develop the diaper of functional gel materials, especially suitable for advanced age. The hydrogel membranes were used as models for diaper. The gel membranes were prepared by insolubilizing poly(vinyl alcohol) with glutaraldehyde and some hydrophobic aldehydes. The amounts of salt sorbed and the salt permeabilites were measured for the gel membranes, and the state of water in the membranes was investigated by means of a differential scanning calorimeter. The gel membrane insolubilized with hydrophobic aldehydes has a freezing water about 2-4 times as much as the membrane crosslinked with glutaraldehyde, and the salt sorption behavior of the membranes was strongly affected by the aldehydes introduced in the membrane especially for the salt composed of strongly hydrated ions. The amounts of salt sorbed were quantitatively explained by the "two state model" proposed in the study. In the model, it is assumed that the freezing and the nonfreezing waters indicate the different solubilities for the salts. These results were interpreted in terms of the interactions between the polymer and the salts. These results were interpreted in terms of the interactions between the polymer and the ions through the hydration layers. The specific interactions as mentioned above is found to be important for designing of functional gel materials for diaper suited for advanced age.