镁离子对PVA/GG-Mg2+复合水凝胶的结构和物理化学性质的影响

Effect of Mg2+ on structure and physical chemistry properties of PVA/GG-Mg2+ composite hydrogels

聚乙烯醇(PVA)和结冷胶(GG)构成的复合水凝胶(PVA/GG)有助于提高材料的生物相容性,在生物材料方面得到广泛的关注和应用。为进一步改善其结构和力学性质,在PVA/GG中引入Mg2+参与高分子链的交联,合成了PVA/GG-Mg2+复合水凝胶。通过分析其网络结构、力学性质、溶胀和热失水动力学,研究了Mg2+对分子间作用、水凝胶结构和性质的影响。结果表明在PVA/GG-Mg2+水凝胶中,Mg2+对重组网络结构、增强力学性能、强化离子与高分子的静电和氢键作用、改进水凝胶的保水性能等方面起到了很重要的作用。系统中Mg2+所产生的影响与PVA/GG-Ca2+和PVA/GG-Al3+复合水凝胶中Ca2+和Al3+的影响相似。研究有助于复合水凝胶在生物材料领域的应用。

The composite hydrogels of polyvinyl alcohol(PVA)and gellan gum(GG)are of interesting in the biomaterials application for its better biocompatibility.To improve the structure and mechanical properties of hydrogels,in this work,Mg2+was introduced to crosslink the polymer chain,and the PVA/GG-Mg2+hydrogel was formed.By analyzing its network structure,mechanical properties,swelling and dehydration kinetics,the effect of Mg2+on the molecular interaction,hydrogel network structure and physical properties have been observed.The result indicates that,Mg2+plays an important role in PVA/GG-Mg2+hydrogel,it reorganizes the network structure,enhances the mechanical properties,strengthens the electrolytic and hydrogen bonding interactions,and improves the water holding property.The effect of the interaction between GG and Mg2+is similar to the composite hydrogels of PVA/GG-Ca2+and PVA/GG-Al3+.These observations will help the development of composite hydrogels in biomaterials application.