Preparation and structural characterization of nano-silver/cyclized polyacrylonitrile composite
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摘要: 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10 nm。Abstract: The silver/polyacrylonitrile(Ag/PAN) composite was synthesized by aqueous in situ precipitation polymerization. The influence of the reactant ratio on molecular mass of Ag/PAN was investigated by measuring its relative viscosity. The optimized synthetic condition of the as-prepared composite is that the concentrations of acrylonitrile(AN) monomer, AgNO3 and K2S2O8 are 10%, 0.6% and 2%, respectively. The nano-silver/cyclized polyacrylonitrile (Ag/C-PAN) composite was prepared by the preoxidation of resultant Ag/PAN. The components, and also the relative cyclization indexes of nano-Ag/C-PAN composite at different preoxidation temperatures and times were analyzed by FTIR spectrum. The microstructure of the as-prepared composites was characterized by TEM and XRD. The results show that silver nanoparticles with diameter about 10 nm and appeared as face-centered cubic crystal are homogeneously dispersed in the cyclized PAN matrix.
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