低温水凝胶力学性能的研究

Studies on Mechanical Properties of Cryo-Hydrogel

本文采用单向压缩和单向拉伸法测定了聚乙烯醇(PVA)低温水凝胶的力学性能。结果表明,其机械强度随凝胶浓度和冷冻时间的增加而增强。得到弹性模量与凝胶浓度的关系符合标度律。说明采用低温处理方法可使PVA水溶液凝胶化,制得含水量高、具有较高强度、类似于橡胶的弹性材料,认为其力学强度来自于物理交联网络的贡献。

In this paper,a cryo-hydrogel elastomer, containing, more than 85% water, was prepared by freezing aqueous solution of poly(vinyl alcohol)(PVA). The mechanical properties of cryo-PVA-hydrogel were studied by one way extension and compression. The experimental results show that the mechanical strength is increased with increasing the polymer concentration and the freezing time. The relationship between the elastic modulus and the gel concentration is in accordance with the scaling law It is suggested that the mechanical strength of the cryo-hydrogel is based on the contribution of physical crosslinking networks.