Induced Self-assembly Behavior And Application Of Calixarene-containing Polyamides

A linear polyamide,poly-5,11,17,23-tetra-tert-butyl-25,27-di(piperazine-amide)-26,28-dihydroxycalix[4]arene(D),composed of macrocycle and small heterocycle was synthesized using 5,11,17,23-tetra-t-butyl-25,27-di(chloroacetyloxy)-26,28-dihydroxy calix[4]arene(DC)and piperazine as monomer through interfacial polymerization.The polymer self-assemblied into two kinds of vesicles,with the average diameters of 28 nm and 164 nm,respectively.D displayed abundant self-assembly behavior under different inducing factors,including solvent polarity,hydrogen bond donors,metal ions Pb2+,Cu2+,Ce3+ and La3+,and neutral molecular 2,2'-bipyridine.Under synergetic effect of metal-cations water and EtOAc,D formed a foam-like supramolecular construction at the interface of water-ethyl acetate.The foams were the crosslinking structures of metal-D ligand by hydrogen bonds.Foam can be eliminated by hydrochloric acid or ethanol.Ce3 + and D formed a dark purple nanofibers mat with good strength at the interface,which can be taken out of the system directly.This work provided a new method to identify and extract rare earth metal ions such as Ce3+ from water.The nanofiber mat could be treated with dilute hydrochloric acid to release chelated Ce3+ and D was renewed to EtOAc solution during this process.