Method and Model for the Analysis of Gel-Blocking Effects during the Swelling of Polymeric Hydrogels
Method and Model for the Analysis of Gel-Blocking Effects during the Swelling of Polymeric Hydrogels
复制标题
聚合物水凝胶溶胀过程中凝胶阻塞效应分析的方法和模型
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Ulbricht
中科院分区：
文献类型：
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作者：
Holger Wack;M. Ulbricht
研究了一种测定高分子水凝胶溶胀压力的方法。该方法是基于确定在一个定义的膨胀体积的膨胀压力，小于体积的凝胶可以通过自由膨胀到平衡。数据的一种类型的聚合物颗粒制成的弱交联和部分中和的聚（丙烯酸）在去离子水中的溶胀。对于在0.05 - 0.30范围内的聚合物体积分数（φP），获得在0.25 - 4.31 MPa范围内的溶胀压力。的动力学数据进行了讨论与组合的扩散-松弛模型为低和中等聚合物体积分数。提出了一种新的模型，为更高的聚合物体积分数。在此φP范围内明显的凝胶阻塞效应的机制在新模型中以阻塞因子的形式进行解释和考虑。所获得的结果可用于基于“超吸收聚合物”的改进密封概念的设计。
This paper focuses on a method to determine the swelling pressure of polymeric hydrogels. The method is based on determining the swelling pressure at a defined volume of swelling that is smaller than the volume the gel can attain by free swelling to equlibrium. Data for one type of polymer particles made from weakly cross-linked and partly neutralized poly(acrylic acid) are presented for swelling in deionized water. For polymer volume fractions (φP) in the range of 0.05−0.30, swelling pressures in the range of 0.25−4.31 MPa were obtained. The kinetic data are discussed with a combined diffusion−relaxation model for low and medium polymer volume fractions. A novel model is presented for higher polymer volume fractions. The mechanism of the gel-blocking effect that is evident in this φP range is explained and considered in the novel model, in the form of a blocking factor. The results obtained may be used for the design of improved sealing concepts that are based on “super absorbing polymers”.