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

doi:10.11949/0438-1157.20191330

摘要/Abstract

摘要：

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。

关键词: 聚乙烯醇, 结冷胶, 镁离子, 网络结构, 力学性质, 脱水动力学, 溶胀

Abstract:

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.

Key words: polyvinyl alcohol, gellan gum, Mg²⁺, network structure, mechanical property, dehydration kinetics, swelling

中图分类号:

TQ 610.495

王飞, 白同春. 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[J]. 化工学报, 2020, 71(1): 376-387.

Fei WANG, Tongchun BAI. Effect of Mg²⁺ on structure and physical chemistry properties of PVA/GG-Mg²⁺ composite hydrogels[J]. CIESC Journal, 2020, 71(1): 376-387.

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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

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