Preparation And Its Gradient Interpenetrating Structure Forming Mechanisms Of Polymer-Based Metal Gradient Composite Materials

Bicopolymer of acrylonitrile and methyl acrylate(P(AN-co-MA)), of acrylonitrile and sodium allyl sulfonale(P(AN-co-SAS)) and of acrylonitrile and vinyl acetate(P(AN-co-VAc)) have been synthesized separately in order to analyze the effects of the second monomer units and the third monomer units of acrylonitrile tercopolymer on the process of copper deposition in polyacrylonitrile-based metal gradient composite film(PMGCF) as well as the flexibility of the film. P(AN-co-MA) and P(AN-co-SAS) were polymerized in aqueous medium using NaCl 0{桸a^SO., as an initiator. P(AN-co-VAc) was obtained by aqueous suspend copolymerization, azo-bis-iso-butyronitrile(AIBN) as the initiator. The interpenetration network structure between polymeric matrix and deposited metal has been observed under a scanning electronic microscope.PMGCF was prepared through solution-reduction-synthesis (SRS). At first, polymer-metal salt-solvent solution was prepared, and then it was coated on the cathode surface. Finally the electrochemical reduction was processed in a particular medium solution. The writer designed a novel plane-style electrode, which improved the efficiency and effect of the experiment largely.There isn't copper deposition in the film using P(AN-co-MA) as polymer matrix. The volume of copper deposition in P(AN-co-SAS) matrix is lower than that in the mixture of P(AN-co-SAS) and P(AN-co-MA). The flexibility of the film was improved, when P(AN-co-VAc) was added into the commercial PAN; but the volume of copper deposition was decreased. The experiments showed that copper deposition volume and crystal structure were greatly11influenced by the pH value of electrochemical reduction medium solutions. It was the especial congregate structure of polymer matrix that was necessary for the forming of interpenetrate network between the polymer and metal. The second monomer units of acrylonitrile tricopolymer leaded to the advantage to establish the twisted knots of the polymer network. The third monomer units helped the solvolyzed copper ion transfer in the film and benefited the forming and establishment of the networks of polymer matrix.