Study of polyaniline polyacrylamide composites by positron annihilation technique

Polyaniline doped with nonoxidizing Bronsted acids is recognized as a conducting material, as its electrical conductivity changes with percentage of doping. In the present work, different percentages of doped polyaniline were blended with polyacrylamide and their electrical conductivities as well as the positron annihilation lifetimes were measured. Analysis of data yielded three lifetime components. It was observed that the value of the short lifetime component remained constant for doping concentration, whereas that of the intermediate component τ₂ decreased. The relative intensity pertaining to τ₂, however, increased with the increase in doped PANI concentration. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 930–933, 2003     

碘掺杂聚苯胺催化合成苯甲醛-1,2-丙二醇缩醛

自制了PAn(聚苯胺)-I2(碘)催化剂,并对其结构进行了表征。通过苯甲醛和1,2-丙二醇为原料合成苯甲醛-1,2-丙二醇缩醛,探讨了PAn-I2催化剂对缩醛反应的催化活性,表明PAn-I2是合成苯甲醛-1,2-丙二醇缩醛的良好催化剂。系统地研究了原料配比、催化剂用量、带水剂用量、反应时间诸因素对产品收率的影响,在n苯甲醛∶n1,2-丙二醇=1∶1.5、催化剂用量为反应物料总质量的0.98%、带水剂环己烷用量为14mL、反应时间2h的优化条件下,苯甲醛-1,2-丙二醇缩醛的收率可达91.0%。     

Shrinking rate of conducting grains in HCl–protonated polyaniline,polypyrrole, and polypyrrole/polyaniline blends with their thermal aging

The dc electrical conductivity (σ) of HCl‐protonated polyaniline, polypyrrole, and their blends was measured from 80 to 300 K for thermal aging times between approximately 0 and 600 h. The thermal aging took place at 70°C under room atmosphere. The change of σ with the temperature (T) and the decrease of σ with the thermal aging time (t) are consistent with a granular metal type structure, in which conductive grains are randomly distributed into an insulating matrix. Aging makes the grains shrink in a corrosion‐like process. From σ = σ(T) measurements the ratio s/d, where s is the average separation between the grains and d their diameter, as well as the rate d(s/d)/dt of their decrease with t were calculated. These revealed that the conductive grains consist of a shell, in which aging proceeds at a decreasing rate, and a central core, which is consumed at a much slower rate. Our measurements not only permitted the estimation of the shell thickness, which lies between 0 and 5 Å, but also gave quantitative information about the quality of the shells and the cores from their aging rates. The shells are consumed with an average rate of d(s/d)/dt = 6.6 × 10^?4 (h^?1), which is about 5 times greater than the more durable cores. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 117–122, 2005     

Transmission properties for individual electrochromic layers in solid state devices based on polyaniline, Prussian Blue and tungsten oxide

In order to investigate the transmission properties in the whole solar spectrum for individual electrochromic layers in solid state devices incorporating polyaniline (PANI), Prussian Blue (PB) and tungsten oxide (WO3), the devices were fabricated with and without holes in the electrochromic coatings in several combinations. Both PANI and WO3 were deposited electrochemically on indium–tin oxide (ITO) glass substrates, while PB was deposited on top of the PANI coatings or directly on the ITO glass plates. Solid state devices were made by gluing the glass plates together with the solid polymer electrolyte poly(2-acrylamido-2-methyl-propane-sulphonic acid) (PAMPS), and thus, with and without holes in the three electrochromic coatings in different combinations, enabling us to study the optical properties of PANI, PB and WO3 separately, that is, the hole method. This method gives good qualitative, and to a certain degree quantitative, information, which may be of valuable help in designing electrochromic devices with specific tailor-made optical properties.     

聚苯胺/涤纶导电织物再掺杂及洗涤性能的研究

采用现场吸附聚合法制备了聚苯胺 /涤纶导电织物 ,采用不同种类的酸对其进行再掺杂 ,研究了酸的种类对织物导电性能的影响 ,并对导电织物进行了洗涤实验及洗涤牢度实验。结果表明 :无机酸对导电织物的掺杂效果优于大多数有机酸。导电涤纶织物的导电性能受洗涤液酸碱度的影响 ,其中碱性洗涤液使导电性能降低 2个数量级 ,酸性洗涤液使导电性能下降 1个数量级 ,而且聚苯胺在涤纶织物表面具有良好的附着性     

导电高分子纳米复合材料研究进展

介绍了导电高分子纳米复合材料的特点,综述了导电高分子纳米复合材料的最新研究进展,展望了导电高分子纳米复合材料的发展前景。     

磷钨酸掺杂聚苯胺催化剂催化合成苹果酯

自制了磷钨酸(H3PW12O40)掺杂聚苯胺(PAn)催化剂H3PW12O40/PAn。以乙酰乙酸乙酯和乙二醇为原料合成苹果酯,较系统地研究了原料摩尔比、催化剂用量、反应时间诸因素对产品收率的影响。实验表明,合成苹果酯的适宜反应条件为n(乙酰乙酸乙酯)∶n(乙二醇)=1∶1 5,催化剂用量为反应物料总质量的1 0%,环己烷为带水剂,反应时间50min。上述条件下,苹果酯的收率为81 0%。     

聚苯胺/沸石分子筛复合材料的湿敏特性研究

酸化的聚苯胺是一种很有应用前途的感湿材料,沸石分子筛具有离子交换作用和较大比表面积的优良特性。将沸石分子筛与聚苯胺复合,可以增强聚苯胺的吸湿能力和载流子的移动性,进而改良感湿特性。利用结构导向剂法合成了沸石分子筛,与酸化的聚苯胺复合,并测量复合材料的感湿特性。与纯的聚苯胺相比,复合材料在低湿范围内有更好的灵敏度。     

碘掺杂聚苯胺催化剂催化合成丁酮1，2-丙二醇缩酮

报道了单质碘掺杂聚苯胺催化剂I2／PAn的制备，采用正交试验探讨了合成丁酮1，2-丙二醇缩酮的影响因素。实验结果表明，对丁酮1，2-丙二醇缩酮的收率影响最大的是催化剂用量，其次是反应时间和原料摩尔比。碘掺杂聚苯胺催化剂催化合成丁酮1，2-丙二醇缩酮的适宜的反应条件是n（丁酮）：n（1，2-丙二醇）=1：1、5，w（催化剂）=0．4％，环己烷为带水剂，反应时间75min。在上述条件下，丁酮1，2-丙二醇缩酮的收率可达80.8％。     

Effect of Co2+, Ni2+, Cu2+, or Zn2+ on properties of polyaniline nanoparticles

Uniform polyaniline (PANI) nanoparticles with typical sizes of about 50 nm were electropolymerized on indium tin oxide surfaces in the presence of Co²⁺, Ni²⁺, Cu²⁺, or Zn²⁺. According to shaping theory, we first suggest the reason forming PANI spherical particles. Their conductivity, UV‐vis spectra, FTIR spectra, X‐ray diffraction, and thermogravimetric analysis were investigated. The conductivities and crystallinity of PANI doped with these ions are higher than those of PANI doped with HCl (PANI/HCl). Both UV‐vis absorption spectra and FTIR spectra indicate the interactions between Co²⁺, Ni²⁺, Cu²⁺, or Zn²⁺ and PANI chains. TG analysis also shows that the thermal stability of PANI doped by Co²⁺, Ni²⁺, Cu²⁺, or Zn²⁺ is lower than that of PANI/HCl. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007