Study On The PH Stimuli-Responsive Controlled Release Based On Cucurbit[6]uril Pseudorotaxane

Not only the coursing of huge economic loss to human society, sometimes metal corrosion also led to disastrous consequences. The study on the anti-corrosion of metals almost started with the using of metals. Researchers found a lot of measures to reduce metal corrosion damage, corrosion inhibitors stand out because a variety of advantages. With the development of science and technology, the traditional method that simply add corrosion inhibitor into medium can’t be satisfied with the needs of people. In order to meet economic and efficient anti-corrosion, it is hoped that the concentration of corrosion inhibitor can be controlled by the change of the properties of medium.In this paper a kind of bis-pyridine quaternary ammonium, brominated1-(6-(4-amiopyridine)hexyl)pyridine, was chosen and synthesized. The target product was comfirmed by FTIR, MS and1H-NMR. Inorganic mesoporous materials MCM-41was performed organic functionalization by using APTES,1,6-dibromo hexane as well as bis-pyridine quaternary ammonium. A supramolecular system, pseudorotaxane, was assembled by using organic functional MCM-41which adsorbed corrosion inhibitor BTA as object and cucurbit[6]uril as subject respectively. The processes of organic functionalization as well as adsorption-assembly were characterized by FTIR, TGA, XRD and SSNMR respectively. pH Stimuli-Responsive on assembled pseudorotaxane were studied by UV-VIS.Results show that:Under neutral condition, ring-shaped CB6molecules of organic functional and adsorption-assembly pseudorotaxane CB6-MCM is connected to alkyl diamine chain through ion-dipole interaction, this kind of connection can prevent the release quantity of BTA; However, the release quantity of BTA in pseudorotaxane increases with the increase of pH, because ammonium ions take off protons and ring-shaped CB6molecules are far away from the orifice of mesoporous; Under acid condition, the cover of cucurbit[6]uril can be recovered through heating and the release of BTA is prevented again, because alkyl diamine chain is protonated and CB6molecules reconnect to alkyl diamine chain for the energy barrier was broken. The pseudorotaxane was designed and synthesized reaches the initial design goals.