Topic
Sodium sulfide
About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.
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TL;DR: The surface of high-grade mineral pyrite from Huanzala, Peru, appeared to oxidize rapidly on exposure to the atmosphere and the oxidized surface was hydrophilic as discussed by the authors.
11 citations
Patent•
27 May 1981
TL;DR: In this paper, a ply-p-phenylene sulfide film was obtained with a desired melting viscosity of 100- 60,000cgs. at shear rate of 200(sec), a relative crystalization degree of 5-35, a dimension of microcrystal of 40-150Angstrom and an orientation in the edge and end directions of 0.1-0.6.
Abstract: PURPOSE:To obtain a ply-p-phenylene sulfide film excellent in the thermal, mechanical and dimensional stability including phenylene sulfide as a main structural unit and having specified melt viscosity, relative crystallization, degree dimension of microcrystal and orientation. CONSTITUTION:Sodium sulfide and the like and p-dihalobenzene such as p-dichlorobenzene are polymerized under pressure in a high-boiling polar solvent to obtain a polymer containing more than 90mol% of a structural unit indicated by the molecular formula. This polymer is melt-extruded and then cooled at a speed higher than 10 deg.C/sec. to form an amorphous film. The amorphous film thus obtained is subjected to a biaxial stretching preferably at a temperature of 85 deg.C-110 deg.C so as to have an enlarged area 8.5-21 times as large as the original one, and further to a heat setting in a stretched state at a temperature of 200 deg.C-275 deg.C for 1-300sec. Thus a desired quality of film can be obtained having a melt viscosity of 100- 60,000cgs. at shear rate of 200(sec) , a relative crystalization degree of 5-35, a dimension of microcrystal of 40-150Angstrom and an orientation in the edge and end directions of 0.1-0.6.
11 citations
TL;DR: In this paper, the authors used visible light active Sb 2 S 3 photocatalyst powder for the treatment of colored wastewaters containing methyl orange and achieved a degradation mechanism based on the characterization and photocatalytic studies.
11 citations
TL;DR: In this article, a poly(meta-aryl sulfide amide amides amide) (m-PASAA) was prepared with aromatic nucleophilic substitution reaction: by the step polycondensation of sodium sulfide(Na2S· xH2O) with 3,3′ -bis(4-diflurobenzoyl) aryl diamine between 180-202°C at atmospheric pressure.
Abstract: Poly(meta-aryl sulfide amide amide) (m-PASAA) was prepared with aromatic nucleophilic substitution reaction: by the step polycondensation of sodium sulfide(Na2S· xH2O) with 3,3′ -bis(4-diflurobenzoyl) aryl diamine between 180–202°C at atmospheric pressure. The polymers were characterized by FT-IR spectrum, 1H-NMR spectrum, 13C-NMR spectrum, X-ray diffraction, element analyzer, DSC, TGA, AFM, instron universal tester and dissolvability experiment. The intrinsic viscosity of m-PASAA was 0.41–0.46 dl/g obtained with optimum synthesis conditions. The polymers were found to have excellent thermal performance with glass transition temperature (Tg) of 233.5–277.8°C, initial degradation temperature (Td) of 447–456.7°C. They could afford flexible and strong films with tensile strengths 38.4–46.1MPa. At the same time, their solubility was much better than polyphenylene sulfide (polyphenylene sulfide scarcely dissolves in whole organic solvents under 200°C (1)).
11 citations
Patent•
01 Sep 1982TL;DR: In this article, a method for dehydrating pre-polymerization mixtures in the preparation of poly(arylene sulfide) in which a reaction mixture of a sulfur source and an organic amide are contacted at a first pressure within a range of 138 kPa to 414 kPa and an initial temperature in a range from 149 °C to 204 °C.
Abstract: A method for dehydrating pre-polymerization mixtures in the preparation of poly(arylene sulfide) in which a reaction mixture of a sulfur source and an organic amide are contacted at a first pressure within a range of 138 kPa to 414 kPa and an initial temperature in a range of 149 °C to 204 °C to form a complex of the reactants with the mixture subsequently subjected to a decrease in pressure while elevating the temperature to a second temperature at which, at the chosen pressure, essentially all water is removed from the mixture. Other compounds including bases, alkali metal carboxylates, alkali metal carbonates, lithium halides, and lithium borate can be present in the reaction mixture. Preferably the sulfur source is sodium sulfide and the organic amide is N-methylpyrrolidone.
11 citations