There exist two theories on the swelling behavior of cross-linked polymer networks treated by statistical thermodynamic and scalar methods, respectively. These two theories predict inconsistent network chain length dependence of the swelling ratio. The swelling of biopolymer gels is analysed with scaling laws from polymer physics, as an alternative for the classical Flory-Rehner theory. In this paper, the swelling data of sodium lignosulfonate grafted polyacrylic acid cross-linked networks in good solvents are reanalyzed, and it is pointed out that these networks are a typical model network conforming to the two-phase structural picture. For the swelling behavior of gels in the semi-dilute regime we derive the scaling theory based swelling equations, which make them compact and universal character.

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木质素磺酸钠接枝聚丙烯酸两相结构高吸水性水凝胶的溶胀行为

关于经统计热力学和标量方法处理的交联聚合物网络的溶胀行为存在两种理论。这两种理论预测了膨胀率对网络链长度依赖性的不一致。作为经典 Flory-Rehner 理论的替代方法，使用聚合物物理学的标度定律来分析生物聚合物凝胶的溶胀。本文重新分析了木质素磺酸钠接枝聚丙烯酸交联网络在良溶剂中的溶胀数据，指出该网络是符合两相结构图的典型模型网络。对于半稀释状态下凝胶的溶胀行为，我们推导了基于标度理论的溶胀方程，这使得它们具有紧凑和通用的特性。