Coordinated Organogel Templated Fabrication For Functional Polymer Nanowires

Recently, coordinated gels have attracted much more attention in the research of supramolecular chemistry. Owing to the coordination bonds between metal ions and ligand molecules, coordinated gels performance excellent heat-stability and form regular network structure. They could be used as sorbents, catalyst carrier, drug delivery materials, as well as templates for fabrication of polymer nano/micron structure. These kinds of template show great potential in the application of supramolecular design. However, relevant researches in this field are still limited or undeveloped.In this paper, a coordinated organogel with 3D-network nanostructure was prepared for template polymerization of functional nanowires. The main works are presented as below:1. The Ag(I)-coordinated organogel was used as template to fabricate Ag/Polypyrrole composite nanowires in one-step procedure at room temperature. Using Ag+ as oxidants, redox-polymerization of pyrrole took place on the gel fiber, giving product of composite nanowires. The morphology of nanowires was characterized by TEM and SEM. And EDX, XRD analysis were presented to confirm doping of Ag nanoparticles in PPy matrix. The template fabrication could take place in different solvents like THF and n-butanol.2. Polymerization of diacryolyl-2,6-diaminopyridine (DADAP) was carried out in Ag(I)-coordinated organogel with BPO as initiator, resulted in polymer nanowires bearing triple hydrogen bonding units. The white product was more tough than coordinated gel, with excellent self-supporting ability. We conclude this mechanism of"self-degraded template polymerization"by analysizing sample obtained at different reaction time.3. The polymer nanowires with triple hydrogen bonding units were utilized as sorbent in thymidine THF solution. We found that the concentration of guest molecule (thymidine) decreased as prolonging the adsorption time. Contrast experiments based on poly(methylenebisacrylamide) (PMBA) nanotubes proved that the absorption effect was mainly attributed to the formation of triple hydrogen bonding between host and guest molecules in dilute solution.