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阳离子共聚物poly(HEMA-co-DMA+)(HEMA—甲基丙烯酸-β-羟乙酯,DMA—甲基丙烯酸-N,N-二甲氨基乙酯)经原子转移自由基聚合和季铵化反应得到。采用乳液聚合法制备甲基丙烯酸甲酯(MMA)和甲基丙烯酸(MAA)的交联微凝胶poly(MMA/MAA)。微凝胶和阳离子共聚物混合后调节pH,形成离子键交联的复合水凝胶。SEM结果显示复合水凝胶具有珊瑚状疏松网络结构,形成了更好的介质输送通道。流变学研究结果表明,微凝胶和阳离子共聚物的质量比为12/7时,复合凝胶具有更高的临界屈服应变(γ*≈10),而同浓度微凝胶形成的凝胶γ*≈1.75。
Cationic Copolymers of Poly (HEMA-co-DMA +) (HEMA-β-Hydroxyethylmethacrylate, DMA-Methacrylic Acid-N, N-Dimethylaminoethyl) by Atom Transfer Radical Polymerization and Quaternization The reaction is obtained. The crosslinked microgels poly (MMA / MAA) of methyl methacrylate (MMA) and methacrylic acid (MAA) were prepared by emulsion polymerization. The microgel and the cationic copolymer are mixed to adjust pH to form ion-crosslinked composite hydrogel. SEM results show that the composite hydrogel has a coral-like loose network structure, forming a better medium delivery channel. The results of rheological studies showed that the composite gels had a higher critical yield strain (γ * ≈10) at the mass ratio of microgel to cationic copolymer of 12/7, while the gel with the same concentration of microgel γ * ≈1.75.