【作者】 李灿灿； 陈建； 彭静； 许零； 李久强； 翟茂林；

【Author】 LI Can-can;CHEN Jian;PENG Jing;XU Ling;LI Jiu-qiang;ZHAI Mao-lin;Beijing National Laboratory for Molecular Sciences,Radiochemistry and Radiation Chemistry Key Laboratory for Fundamental Science,College of Chemistry and Molecular Engineering,Peking University;Department of Energy and Resources Engineering,College of Engineering,Peking University;

【机构】 北京大学化学与分子工程学院放射化学与辐射化学重点学科实验室北京分子科学国家实验室； 北京大学工学院能源与资源工程系；

【摘要】 聚（甲基丙烯酸N,N-二甲氨基乙酯）（PDMAEMA）,由于其具有温度和pH双重敏感性,在药物释放、污水处理等方面具有潜在应用而受到了广泛的关注。近几年,我们课题组在PDMAEMA及其衍生物水凝胶的辐照合成、凝胶结构、溶胀行为及其应用等方面做了大量的研究,成功制备了多种基于DMAEMA的刺激响应性功能材料。本工作采用γ射线辐照技术,成功制备了性能优越的PDMAEMA凝胶。凝胶的溶胀动力学实验表明PDMAEMA水凝胶的溶胀度随时间的增长先增大后减小,表现出过溶胀行为。借助扫描电镜和红外光谱解析了凝胶的过溶胀行为机理。进一步,我们将不同链长的1-溴烷烃(1-C_nH_2n+1Br,n代表烷基链长,n=2,4,6,8,12)通过季胺化反应接到DMAEMA上,合成了一系列两亲性单体甲基丙烯酰氧乙基二甲基烷基溴化铵（MADAB）。同样利用辐射技术合成了一系列PMADAB凝胶,优化了凝胶的合成条件,系统研究了不同疏水链长的PMADAB凝胶的溶胀动力学,温度、离子强度刺激响应性行为及机理。而后,我们将制备的PMADAB凝胶用于水中重金属离子Cr（Ⅵ）的吸附,结果表明PMADAB（n<8）凝胶是Cr（Ⅵ）的良好吸附剂,利用Langmuir吸附等温式计算得最大吸附量为147²10 mg/g。利用FTIIR和X射线光电子光谱（XPS）验证PMADAB（n<8）凝胶对Cr（Ⅵ）的吸附为离子交换机理。更多还原

【Abstract】 Poly（dimethylaminoethyl methacrylate）（PDMAEMA） has attracted extensive attention due to the temperature and pH dual stimulus sensitivities.In recent years,we have done plenty of works on the radiation synthesis,structure,swelling behavior and applications of PDMAEMA hydrogel as well as its derivative hydrogels.Herein,PDMAEMA hydrogels and a series of amphiphilic poly（methacryloxyalkyl dimethyl ethane） ammonium bromide（PMADAB） hydrogels were successfully synthesized by using y-ray radiation with poly（ethyleneglycol dimethacrylate） as cross-linker.Effects of radiation conditions,temperature,ionic strength,pH and gel structure on the swelling behavior of the resultant hydrogels were comprehensively investigated.Furthermore,Adsorption behavior of Cr（Ⅵ） ions of PDMADAB hydrogels were also carefully studied,and we found that the maximum theoretical Cr（Ⅵ） uptake of PMADAB（n<8）gel was 147²10 mg g^-1.It is expected that the PDMAEMA and PMADAB hydrogels would find potential applications in drug release and waste water treatment.更多还原