Wen Xing, Tang Liming, Qiang Lu
Key Laboratory of Advanced materials of Ministry of Education of China, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China.
Soft Matter. 2014 Jun 14;10(22):3960-9. doi: 10.1039/c4sm00121d. Epub 2014 Apr 14.
pH responsive poly(N,N'-methylenebisacrylamide-co-4-vinylpyridine) (P(MBA-4VP)) one dimensional (1D) nanostructures have been prepared by metallogel template copolymerization, which was carried out in an Ag(i)-coordinated organogel with benzoyl peroxide (BPO) as the initiator. The product has been characterized using infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. The experimental results reveal that the gel fiber is a crucial template for polymerization. Due to the degradation of the template in copolymerization, nanofibers of metallogel were transcribed to copolymer nanowires. The introduction of co-monomer 4-vinylpyridine (4VP) imparts to the 1D copolymer nanostructures pH sensitivity and the possible use as an adsorption material of aspirin. Adsorbed 1D copolymer nanostructures could be regenerated using proton solvent, acid medium and salt solution. In addition, silver nanoparticle loaded copolymer nanowires have been produced from the reduction of silver ions instead of template removal, where silver ions act both as the template and as the nanoparticle growth substrate.
通过金属凝胶模板共聚法制备了pH响应性聚（N，N'-亚甲基双丙烯酰胺 - 共 - 4 - 乙烯基吡啶）（P（MBA - 4VP））一维（1D）纳米结构，该反应在以过氧化苯甲酰（BPO）为引发剂的Ag（I）配位有机凝胶中进行。使用红外光谱、扫描电子显微镜和透射电子显微镜对产物进行了表征。实验结果表明，凝胶纤维是聚合反应的关键模板。由于共聚过程中模板的降解，金属凝胶纳米纤维被转录为共聚物纳米线。共聚单体4 - 乙烯基吡啶（4VP）的引入赋予了一维共聚物纳米结构pH敏感性，并使其有可能用作阿司匹林的吸附材料。吸附的一维共聚物纳米结构可以使用质子溶剂、酸性介质和盐溶液进行再生。此外，通过还原银离子而非去除模板制备了负载银纳米颗粒的共聚物纳米线，其中银离子既作为模板又作为纳米颗粒生长的底物。
