Polyelectrolyte nanocomposite hydrogels (NHGs) were synthesized. NHGs were formed from a polymer matrix composed of a cationic, anionic, and alkylated chitosan polymer modified with vinyl groups (ChAV) to achieve greater crosslinking. Cationic and anionic clays montmorillonite and hydrotalcite, respectively, were used as nanofillers to introduce electrostatic interaction with the matrix. NHGs were obtained via in situ polymerization. The ChAV and NHGs were then characterized. Based on X-ray diffraction and transmission electron microscopy results, the morphology of the nanocomposite was generally intercalated with some nanocomposites showing exfoliation. Rheological studies revealed improvements in shear modulus of NHGs with respect to hydrogel without clay. Lower relaxation times were noted as the clay content increased and it was attributed to the interactions between the clay sheets and the polymer. In conclusion the rheological properties of the material are improved with the addition of clay and the interactions present with the polymer matrix.

中文翻译：

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填充有阳离子和阴离子粘土的聚电解质纳米复合水凝胶。

合成了聚电解质纳米复合水凝胶（NHGs）。NHG由聚合物基体形成，该聚合物基体由阳离子，阴离子和烷基化的壳聚糖聚合物组成，并经乙烯基（ChAV）改性，可实现更大的交联。阳离子和阴离子粘土蒙脱土和水滑石分别用作纳米填料，以引入与基体的静电相互作用。NHG通过原位聚合获得。然后表征ChAV和NHG。基于X射线衍射和透射电子显微镜的结果，纳米复合材料的形态通常嵌入了一些显示剥落的纳米复合材料。流变学研究表明，相对于不含粘土的水凝胶，NHGs的剪切模量有所改善。随着粘土含量的增加，松弛时间降低了，这归因于粘土板和聚合物之间的相互作用。总之，通过添加粘土以及与聚合物基体之间的相互作用，可以改善材料的流变性能。