Thermo- and pH-Responsive Hydrogels Based on N-Isopropylacrylamide and Allylamine Copolymers

• 作者: Anatoly Burban Ganna Pobigai Victoria Konovalova Yuri Samchenko Zoya Ulberg
• 来源期刊: 软金属(英文)
• 学科: 化学
• 关键词: THERMO-RESPONSIVE HYDROGELS Copolymer HYDROGELS ALLYLAMINE HYDROCHLORIDE N-Isopropyl-Acrylamide The Parameter of Flory
• 年，卷（期）: 2013,（4）
• 页码范围: 19-26
• 页数: 8页
• 分类号: O6

摘要

The thermo- and pH-responsive hydrogels were synthesized via copolymerization of N-isopropylacrylamide and al-lylamine hydrochloride monomers. The equilibrium swelling of the hydrogels was studied as a function of temperature and pH in aqueous solutions. It was shown that controlled alteration of the hydrogel phase transition temperature can be achieved by changing their composition and pH of the environment. Increase in content of hydrophilic allylamine from 10 to 60 wt% in monomer mixture causes a shift of the phase transition temperature from 35oC to 47oC. Hydrogels with N-isopropylacrylamide/allylamine hydrochloride mass ratio of 3:2 show the highest pH-response. Values of average molecular weight between polymer cross-links, , and Flory parameter, χ, were calculated using temperature dependences of the equilibrium swelling of the synthesized hydrogel.