Study Of The Coordination Group Functionalized Materials By Radiation Methodand Their Interaction With Heavy Metal Ions

In this study, new methods for preparing ligand group containing functionalpolymeric materials were offered by combining the radiation technology withchemical techniques. Three ligand group containing functional polymericmaterials were successfully prepared, including amidoximated nonwoven fabricabsorbent, amidoximated nano-fabric absorbent and silver functionalizedantibacterial cotton fabrics.Acrylonitrile (AN) monomer was grafted onto polyethylene (PE) nonwovenfabric via the pre-irradiation induced graft polymerization in vapour phase andemulsion system. The degree of grafting (DG) of PE-g-PAN nonwoven fabricwas calculated by the gravimetric method. The kinetic parameters, such astemperature, time and absorbed dose, were studied. The properties of thePE-g-PAN nonwovens were characterized by the Fourier transform infraredspectroscopy (FTIR) study, scanning electron microscopy (SEM) observation,thermogravimetric analysis (TGA) and contact angle (CA) measurement. Theresults demonstrated that the grafting of AN slightly increased the contact angleof the nonwoven fabrics. The mechanical properties degradation should beattributed to the radiation effect and have almost nothing to do with the graftpolymerization procedure.In order to improve the hydrophilicity of the material, pre-irradiation-inducedemulsion co-graft polymerization was used to introduce AN and acrylic acid(AAc) onto PE nonwoven fabric. The results showed that the introduction of AAcmonomer can significantly improve the hydrophilicity of grafted PE nonwovenfabric.Amidoximated nano-fabric absorbents were prepared by electrospinning andthen radiation induced crosslinking, which allow completely avoiding the toxicAN. The morphology, specific surface and adsorption properties of the materialswere characterized. The results showed that amidoximated nano-fabric absorbentsconsist of nano-scale fibers which are determined by the electrospinning parameters. The absorbents have large specific surface. Adsorption properties ofthe materials are in consistent with the amidoximated adsorbent characteristicswith a high adsorption capacity and selectivity for V, U and Ni ions.A novel“one-step”radiation-induced coincident reduction of silver ions andgraft polymerization of monomer containing amino group onto cotton fabric, wasapplied to fabricate an antibacterial cotton fabric with a pomegranate-shapedstructure of wrapped silver nanoparticles aggregations (NPAs) by polymer chainsgrafted onto the surface. The monomer,2-aminoethyl methacrylate (AEMA),with a primary amine group providing the coordination interaction and a doublebond undergoing the free-radical polymerization was chosen in the experiment.The pomegranate-shaped polymer wrapped silver NPAs grown on the surface ofthe cotton fabric allows an excellent laundering durability together withoutstanding antibacterial activity, even after50accelerated laundering cycles,which is equivalent to250instances of home laundering.