Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3348
標題: Studies On Synthesis and Properties of Nanoscale Polyaniline Emulsion
奈米級聚苯胺乳液之合成與性質研究
作者: 鄭漢威
wei, cheng han
關鍵字: polyaniline;聚苯胺;sodium dodecyl sulfate (SDS);conductivity;zeta potential;average particle size;doping level;十二烷基硫酸鈉鹽;導電度;界面電位;平均粒徑;doping程度
出版社: 化學工程學系
摘要: 
In this study, polyaniline (PANI) emulsions were prepared in sodium dodecyl sulfate (SDS) micellar solutions. We investigate the influences of the synthetic conditions of polyaniline emulsions on the interface nature, physical properties and electrical properties of the PANI emulsions and their blend with waterborne polyurethanes (WPU).
Various instruments were used to evaluate these emulsions , for instance: the Fourier-transform infrared spectroscopy, UV-Vis spectrophotometer, differential scanning calorimetry,
thermogravimetric analysis, zeta probe analyzer, dynamic light scattering particle size analyzer. The particle size distributions, zeta potentials, viscosities, conductivities and thermal properties were evaluated at different SDS contents, ammonium persulfate (APS) contents, aqueous HCl volumes and its concentrations.
The polyaniline particle size increases with decreasing SDS concentration and with increasing APS concentration. The polyaniline particle size at different volume of 0.1MHCl addition changes very large, as volume reachs 395ml, the particle size increases to 3329nm lower than critical micellar concentration. The polyaniline particle size ranged from 12.9nm to 20.5nm, while very HCl concentrations between 0.07M and 0.1M. The polyaniline particle size increases with increasing pH value through adding ammonia water. The doping level of polyaniline is the highest at pH=8.9 during adjusting the pH value of the emulsion. The physical properties of the PANI/PU emulsion are better when prepared by in situ polymerization method than by simple mixing.

在本研究中是以乳化法方式來乳化聚合聚苯胺 (PANI),採用sodium dodecyl sulfate(SDS)界面活性劑製備聚苯胺乳液,來探討聚苯胺形成奈米級乳液的合成條件對界面性質、物化特性的影響以及聚苯胺乳液與水性聚胺基甲酸酯 (PU)摻合後的導電性、物性特徵。
利用各種儀器的測試如:傅立葉轉換紅外線光譜儀、紫外光/可見光分光光譜儀、微差掃描卡計儀、熱重損失分析儀、界面電位儀、粒徑分析儀等儀器的輔助,藉以了解聚苯胺乳液因各個變因如SDS量變化、APS量變化、HCl體積與濃度變化以及pH值的變化所造成聚苯胺乳液及其與水性PU摻合物的性質如:粒徑、界面電位、黏度、導電度以及熱性質的變化。
當聚苯胺乳化聚合所使用的sodium dodecyl sulfate(SDS)越多時,聚苯胺的粒徑也會變小(6920nm變小到17nm)﹔而聚合苯胺當作氧化劑的ammonium persulfate (APS)則是加的量越多,聚苯胺的粒徑會隨之增大 (13nm增大到67nm); 聚苯胺乳液在不同0.1M HCl體積下之粒徑到了體積為395ml時粒徑會急遽上升至3329nm,原因是低於臨界微胞濃度所造成; 改變HCl濃度之粒徑只有在濃度為0.07M到0.1M較小 (13nm到21nm), 用其它濃度聚合得到的聚苯胺顆粒都是相當大;當加入氨水改變聚苯胺乳液pH值時,粒徑會因pH值變大而增大(15nm增大到8289nm),而doping程度也會隨著pH值變化而有所不同(pH=8.9時最好);而摻合PANI乳液及水性PU方式以ISP (in situ polymerization)的方式比SM (simple mixing)的方式所得摻合物的物性較好。
URI: http://hdl.handle.net/11455/3348
Appears in Collections:化學工程學系所

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