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采用水相沉淀聚合-原位法合成银/聚丙烯腈(Ag/PAN)复合物,通过测定其相对黏度,系统地考察了反应物配比对Ag/PAN复合物分子量的影响。得到较理想的合成条件为,丙烯腈(AN)单体浓度10%,AgNO3浓度0.6%,K2S2O8浓度2%。将所得复合物进行预氧化后得到纳米银/环化聚丙烯腈(Ag/C-PAN)复合物。通过FTIR分析复合物的组成,并得到不同预氧化温度和时间下复合物的相对环化率。采用TEM、XRD等方法对复合物的微观结构进行表征。结果表明,纳米银均匀地分散于环化聚丙烯腈基体中,银粒子的晶型为面心立方,粒径约为10nm。
The Ag / PAN composite was synthesized by aqueous precipitation polymerization and in-situ method. The relative viscosity of the Ag / PAN composite was systematically investigated. The influence of the ratio of reactants on the molecular weight of the Ag / PAN composite was systematically investigated. The optimal synthesis conditions were as follows: acrylonitrile (AN) monomer concentration of 10%, AgNO3 concentration of 0.6% and K2S2O8 concentration of 2%. The resulting composite was pre-oxidized to obtain a nano-silver / cyclized polyacrylonitrile (Ag / C-PAN) composite. The composition of the complexes was analyzed by FTIR and the relative cyclization rates of the complexes were obtained at different pre-oxidation temperatures and times. The microstructure of the composite was characterized by TEM and XRD. The results show that silver nanoparticles are uniformly dispersed in a cyclized polyacrylonitrile matrix. The silver particles have a face-centered cubic shape with a particle size of about 10 nm.