Preparation And Properties Of Polyaniline Nanon Hybrid Materials

Regarding polyaniline as the research subject of this thesis, two multifunctional nanon hybrid materials of polyaniline were synthesized through microemulsion method, and their structure and properties were characterized. In addition, the preparation technology for Nio.5Zno.5Fe204 nano-particles was also studied.1. The metal hydroxides precipitation was first prepared by coprecipitation under ultrasonic radiation, then it was heated up to boiling reflux and NiZn ferrite crystal with spinel structure could be synthesized by phase transformation step. X-ray crystal structure analysis showed that the impurity phases in products could be avoided by using ultrasonic radiation, and the perfect growing Ni0.5Zn0.5Fe2O4 grains was obtained in a short heat treatment time. The results of morphological analysis and magnetic properties showed that the particle sizes of products prepared by reflux 4 and 5h were respectively about 15 and 18nm, and the dispersion and the distribution of particles was very well; all samples exhibited favorable soft magnetization at room temperature, their saturated magnetic intensities were 54.728 and 59.950emu/g respectively, and the coercitive forces were 0.54996 and 0.59744G.2. The hybrid materials of polyaniline doped with K6(SiW11Ni04oH2)·15H20 (denoted by SiW11Ni) was prepared in micelle. The characterization results of samples'structure and morphology showed that the polyaniline was doped by the insertion of heteropolyanions into molecular chains, obtaining spherical nano composite particles. The test of properties showed that the samples had both conductivity and fluorescence. The investigation result of influencing factors showed that the conductivity and decomposition temperature of doping materials were decreased with a rising polymerization temperature in the range of 5～35℃, while the fluorescence did not show obvious regular changes; The conductivity, fluorescence and decomposition temperature of polyaniline nanocomposites did not change a lot when the polymerization time of polyaniline changed from 4 to 24h; The fluorescence weakened with the increasing doping amount of 1.5g to 6.0g, however, the conductivity and decomposition temperature increased gradually.3. Based on the above results, the Ni0.5Zn0.5Fe2O4/SiW11Ni/PANI nanocomposites were synthesized through microemulsion method under following conditions:the polymerization temperature was 5℃, the polymerization time was 4h, the doping amount of heteropolyacid salts was 6.0g and the content of ferrites changed from 0.5 to 2.0g. It can be predicted from the characterization results that of samples'structure and morphology that the heteropolyanions inserted the polyaniline molecular chains and the doped polyaniline coated on the surface of NiZn ferrite nanopaticles, obtaining spherical nano composite particles with a good dispersion. The characterization results of properties showed that all the samples had both conductivity, fluorescence and magnetic properties, and their conductivity and fluorescence weakened with the increasing content of ferrites in the composite, while the saturated magnetic intensity increased.