摘要
以N,N-亚甲基双丙烯酰胺(N,N-MBA)为交联剂、过硫酸钾(KPS)为引发剂,采用自由基交联共聚法合成了具有pH敏感性的半互穿网络水凝胶聚丙烯酰胺-co-丙烯酸[P(AAm-co-AA)],通过傅立叶红外光谱、差热分析研究了水凝胶的结构及热稳定性。水凝胶的溶胀研究表明,随着缓冲溶液pH值的增大平衡溶胀率增大;在不同缓冲溶液中的理论最大吸水量S∞与实验值基本一致。P(AAm-co-AA)水凝胶的扩散行为在pH=1.47的缓冲溶液中为Fickian扩散模式,在pH=11.04的缓冲溶液中为非Fickian扩散模式。
A pH-sensitive hydrogel with semi-interpenetrating networks(semi-IPN) composed of co-polymer of acrylamide and acrylic acid [P(AAm-co-AA)] was synthesized by a cross-linking co-polymerization route in the presence of N,N-methylene bisacrylamide(N,N-MBA) and potassium persulfate(KPS).The structural and thermal properties of semi-IPN hydrogels were analyzed by infrared spectra(FTIR) and differential thermal analysis.The equilibrium swelling ratio(Qe) increased with the pH value,and the maximum theoretical water contents S∞ was in agreement with the swelling experiment data.The swelling mechanism belonged to a Fickian mode for the P(AAm-co-AA) hydrogels in pH=1.47 buffer solutions.However,the dynamic swelling behavior of P(AAm-co-AA) hydrogels belonged to non-Fickian mode,in pH=11.04 buffer solutions.
出处
《化学与生物工程》
CAS
2011年第3期27-31,共5页
Chemistry & Bioengineering
基金
陕西省教育厅专项科研基金资助项目(2010JK903
2010JK905
2010JK921)
延安大学科研启动基金资助项目(YD2009-07)
延安大学科技创新训练计划项目(D2010-100)