Synthesis And Study Of Photo-responsive Supramolecular Polymers Containing Azobenzene Based On Host-guest Interactions

Supramolecular polymers are a type of polymers which are constructed by reversible and directional noncovalent bonds.Combining the properties of polymer science and supramolecular chemistry,supramolecular polymers become a research highlight recently.Dynamic noncovalent bonds endow supramolecular polymers some special properties such as stimuli-responsiveness,self-healing property and easily degradable,which are distinguishing from traditional polymers.In this dissertation,we designed and constructed some photo-responsive supramolecular polymers.The main content was involved in three parts as following:1.Based on the dual host-guest interactions generated from azobenzene and β-cyclodextrin(β-CD)with calix[4]arene and methyl viologen of bifunctional host and guest monomers in the aqueous solution,a linear supramolecular polymer could be obtained.The resultant polymer exhibited dual stimuli-responsiveness to light irradiation and redox process.Also,the intriguing morphologies change was recorded as the host-guest interactions took place and vanished upon light irradiation.2.A supramolecular hydrogel crosslinked by host-guest interactions via introducing azobenzene and β-cyclodextrin into polyacrylamide was synthesized.The supramolecular hydrogel presented satisfactory performances such as good tensile property,high strength and rapidly room temperature self-healing property.It was photo-responsive for the existence of photo-sensitive groups.The color,tensile property and strength of hydrogel could be regulated by light of different wavelengths.3.An azobenzene and spiropyran functionalized hydrogel associated by hydrophobic interactions was synthesized.The hydrogel was thermo-responsive.The gel-sol transition could be realized by addition of β-CD and competitive guest molecule.