Preparation And Properties Of Polymer Matrix Composites

In recent years,environmental pollution has become a hot topic.In this paper,polymer-based hydrogels and electrospinning film nanocomposites were designed and synthesized.Polypyrrole?PPy?/sodium alginate?SA?,polyvinyl alcohol?PVA?/polyvinyl acid?PAA?were studied./Carboxylated carbon nanotubes?CNT-COOH?and polyvinyl acid?PVA?/polyacrylicacid?PAA?/carboxylatedcarbonnanotubes?CNT-COOH?/palladium nanoparticles composite fibers.As one of the conductive polymer materials,polypyrrole as the electrode material of supercapacitor can improve all aspects of performance.The disadvantage of polypyrrole is that its cycle stability is poor and it can not be effectively used in industry,because the main chain of the polymer is destroyed in a limited number of charge-discharge cycles.Sodium alginate is a natural linear anionic copolymer and an ideal biopolymer for template synthesis of ordered nanostructures.By self-assembly of polypyrrole and sodium alginate,the mixture can be transformed into a stable hydrogel in one step.Polypyrrole/sodium alginate composite conductive hydrogels were prepared by chemical oxidation polymerization.Uniform PAA/PVA binary composite fibers and PAA/PVA/CNT-COOH ternary composite nanofibers were prepared by electrospinning technology.After doping CNT-COOH,the surface area of the composites was increased.The morphology and composition of the composite fibers were characterized.Pd nanoparticles were prepared by reducing PdCl₂ solution with NaBH₄.Then the PAA/PVA/CNT-COOH ternary composite nanofibers were immersed in Pd nanoparticles solution to coat Pd nanoparticles on the surface of the fiber membrane.The PAA/PVA/CNT-COOH@PdNPs composites were successfully prepared.The nano-film was used for catalytic reduction of 4-nitrophenol and 2-nitroaniline aqueous solutions.The final experimental results show that the catalytic reduction performance of PAA/PVA/CNT-COOH@PdNPs composites is good.