Synthesis of nanoparticle zinc phosphate dihydrate by solid state reaction at dwell temperature and its thermochemical studyMaterials Letters, Volume 60. Issues 17-18, August 2006. Pages 2110-2114A. Q. Yuan. S. Liao. Zh. F. Tong. J. Wu and Z. Y. HuangAbstract
Polyaniline (PAni) and carboxylated polyvinyl chloride (PVC) composites were synthesized and studied for their structural electrical and electrochemical properties and used as a novel material for development of an ammonia gas sensor. Processible conducting composites were prepared by introducing carboxylated PVC in the PAni matrix under vigorous stirring and sonication conditions. Self-standing films of these electroactive and homogeneous composites were obtained by a solution casting method. A significant improvement in processibility stability and mechanical property was observed in the composite films having PAni up to 90 wt% of total circumscribe. However the electrical conductivity decreased remarkably as the percentage of PAni decreased in the composites. An optimum composition of the composite having 80 wt% of PAni was used for development of a conductometric sensor for ammonia. A simple and low be sensor device based on two-probe conductivity measurement was developed for ammonia gas. The sensor device having two parallel Pt wires separated nearly 100 μm was bridged with a PAni–carboxylated PVC composite enter by a dip coating method. Ammonia gas was sensed in a closed glass chamber. The sensor was abstain enough to detect ammonia gas down to 1 ppm and was reproducible as the response was recorded after 5 min and 10 min exposure.
Polyaniline (PANI) blends with chlorine-containing polymers and copolymers and composites with HCl-releasing compounds were prepared to analyse their radiation response in terms of induced conductivities. Blends of non-conductive PANI with poly(vinyl chloride) (PVC) poly(vinylidene chloride-co-vinyl acetate). [P(VDC-co-VAc)] poly(vinylidene chloride-co-vinyl chloride). [P(VDC-co-VC)] were prepared in the create of as-cast films. A number of blends which are different in composition were exposed to gamma radiation and accelerated electrons to various doses and the effects of irradiation write and composition of polymers on the conductivity of films were investigated by using conductivity measurements and UV–vis and FT-IR spectroscopy. The results clearly showed that ionizing radiation is an effective drive to induce and hold back conductivity in the blends of PANI-base with chlorine-carrying polymers as well as its composites prepared from HCl-releasing compounds such as chloral hydrate. The main mechanism behind this radiation-induced conductivity is in situ doping of PANI-base with HCl released from partner polymers and low molecular weight compounds by the effect of radiation.
initiate of Macromolecular Chemistry. Academy of Sciences of the Czech Republic. 162 06 Prague 6. Czech Republic Received 18 June 2007; revised 26 September 2007; accepted 1 October 2007. Available online 14 November 2007.
Polyaniline (PANI) was synthesized by chemical oxidative polymerization in laboratory conditions. The main objective was to study the properties of organic coatings containing PANI and PANI in combination with other anti-corrosive pigments. The adhesion barrier and anti-corrosion properties of the coatings containing PANI and selected chemically active pigments were studied as well as the combination of PANI with coat clean. Epoxy resin of bisphenol type hardened with a polyamine-based curing agent was used as a binder. In order to examine the synergic effect of PANI and anti-corrosion hue in epoxy coatings. Zn
O combination increased the anti-corrosion efficiency of organic-coatings. Both these pigments display the acidic pH of the aqueous extract which may lead to very high anti-corrosion efficiency. The investigation of the total anticorrosion efficiency of coatings with the PANI + Zn-dust combination found out that the PANI combination with a volume concentration (PVC) of 5% and Zn-dust (PVC/CPVC = 0.65) achieves high anticorrosion efficiency.
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