Study on the synthesis and performance of hydrogels with ionic monomers and montmorillonite

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• 作者：Kun Xu ; Jihua Wang ; Sheng Xiang ; Qiang Chen ; Wende Zhang ; Pixin Wang
• 关键词：Nanocomposite hydrogel ; Gel strength ; Structure analysis
• 刊名：Applied Clay Science
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：38
• 期：1-2
• 页码：139-145
• 全文大小：945 K

文摘

Two series of the nanocomposite hydrogels were synthesized by in-situ solution polymerization. One pre-gel solution was obtained by directly dispersing the montmorillonite (MMT) powder into aqueous monomer solution and the other pre-gel solution was obtained by mixing monomer aqueous solution and the dispersion of MMT. The structure and performance of two series of hydrogels in dry state were studied by XRD, Raman spectroscopy, TEM and ²⁷Al MAS NMR. Compressing test results showed that the gel strength of the hydrogels prepared by the latter method was much higher than that by the former method. When acryloyloxyethyl trimethyl ammonium chloride (DAC) was introduced into the system, hydrogels with excellent nanostructure could be synthesized. The result of ²⁷Al MAS NMR suggested that the chemical environment of aluminum in MMT was changed by the introduction of DAC due to the interaction between the groups of DAC and MMT layers. Thus, the combination of copolymerizing with strong polar monomers and using the dispersion of MMT were the effective ways to obtain nanocomposite hydrogel of MMT and ionic monomers. The nanostructure of the hydrogel improved the gel strength, while the swelling ratio of the hydrogel depended on synergic effects of multifunctional groups.