P(NIPAm-AABC-NMA)温敏微凝胶自组装膜及其重金属离子选择性  

P(NIPAm-AABC-NMA)thermo-sensitive microgels self-assembled film and its selective response to heavy metal ions

作　　者：张子文 宋秋生 赵程艳 朱林 ZHANG Ziwen;SONG Qiusheng;ZHAO Chengyan;ZHU Lin(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《精细化工》2021年第7期1361-1366,共6页Fine Chemicals

摘　　要：以N-异丙基丙烯酰胺(NIPAm)为单体、丙烯酸(AA)和N-羟甲基丙烯酰胺(NMA)为功能单体,通过自由基乳液聚合制备了P(NIPAm-AA-NMA)微凝胶,利用N-(3-二甲基氨基丙基)-N’-乙基-碳二亚胺盐酸盐(EDC)的耦合作用,实现4’-氨基苯并-18-冠醚-6(ABC)对微凝胶的修饰,合成P(NIPAm-AABC-NMA)微凝胶;进一步,通过溶剂挥发制备微凝胶自组装膜。采用FTIR、SEM和DLS表征微凝胶及其自组装膜的微观结构;采用UV-Vis研究自组装膜的温敏性及其对金属离子的选择响应性能。结果表明,ABC修饰前、后微凝胶粒径分别约为240和300 nm,自组装膜中微凝胶粒径随环境温度或离子浓度变化而变化,自组装膜对入射光的衍射发生显著变化从而呈现不同的结构色。特别是,当Pb^(2+)浓度在0~120μmol/L之间变化时,自组装膜衍射峰红移60 nm左右。P(NIPAm-AA-NMA)microgels were synthesized using N-isopropylacrylamide(NIPAm)as monomer,acrylic acid(AA)and N-hydroxymethylacrylamide(NMA)as functional monomers by free radical emulsion polymerization.Then,P(NIPAm-AABC-NMA)microgels were synthesized by modification of P(NIPAm-AA-NMA)microgels with 4′-aminobenzo-18-crown-6(ABC)in the coupling action of N-(3-dimethylaminopropyl)-N’-ethyl-carbodiimide hydrochloride(EDC).Finally,the P(NIPAm-AABC-NMA)microgel self-assembled film was fabricated by solvent evaporation method.The microstructure of microgels and its self-assembled film were characterized by FTIR,SEM and DLS.Moreover,the temperature-sensitive properties of self-assembled film and its selective response to metal ions were investigated by UV-Vis spectroscopy.The results indicated that the particle size of the microgels before and after decoration by ABC was about 240 and 300 nm,respectively.The particle size of the microgels in the self-assembled film changed with variation of environmental temperature or concentration of heavy metal ions.The diffraction of the self-assembled film to the incident light changed significantly and showed different structural colors.In particular,when the Pb^(2+) concentration changed between 0 and 120μmol/L,the red-shift of diffraction peak of the self-assembled film was about 60 nm.

关 键 词：N-异丙基丙烯酰胺 4′-氨基苯并-18-冠醚-6 微凝胶 自组装 刺激-响应 功能材料 

分 类 号：O631[理学—高分子化学] TB34[理学—化学]