COMPRESSIONAL MODULUS OF SWOLLEN POLYACRYLAMIDE NETWORKS
COMPRESSIONAL MODULUS OF SWOLLEN POLYACRYLAMIDE NETWORKS
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DOI：
10.1021/ma00186a048
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发表时间：
1988-08-01
期刊：
影响因子：
5.5
通讯作者：
ZRINYI, M
中科院分区：
文献类型：
--
作者：
GEISSLER, E;HECHT, AM;ZRINYI, M
对于一组名义上相同的聚丙烯酰胺-水凝胶样品，在Mn值（通过准弹性光散射观察到的纵向渗透模量）、渗透模量KM（通过溶胀压力测量观察到的渗透模量）和剪切模量G（通过机械变形测量到的剪切模量）之间进行实验比较。从理论上考虑，它表明，在非均匀凝胶Kx+ 4/3G> Mx。然而，实验观察到的差异大于这些凝胶异质性的预期，并归因于光散射技术中使用的校准方法。本研究结果可作为后一种方法的校正。所有结果与良好溶剂结垢预测一致，其适用于渗透去溶胀测量，直到浓度为0.25g cm-3。此外，渗透泊松比采用0.275±0.011的值，与在良溶剂中完全溶胀的凝胶的预期值（即0.278）一致。
For a set of nominally identical polyacrylamide-water gel samples an experimental comparison is made between the values of M „, the longitudinal osmotic modulus observed by quasi-elastic light scattering, the osmotic modulus KM, observed by swelling pressure measurements, and the shear modulus G, measured by mechanical deformation. From theoretical considerations it is shown that in inhomogeneous gels Kx+ 4/3G> Mx. The difference observed experimentally is, however, larger than expected from the heterogeneity of these gels and is attributed to the calibration method used in the light-scattering technique. Thepresent results can thus be used as a calibration for the latter method. All the results are consistent with good solvent scaling predictions, which apply for the osmotic deswelling measurements, up to concentrations of 0.25 g cm" 3. Moreover, the osmotic Poisson ratio adopts a value 0.275±0.011, in agreement with that expected for fully swollen gels in a good solvent, namely, 0.278.