Vinyl pyrrolidone/vinyl acetate ..

Nanowire-shaped silver have been synthesized by the polyol process in ethylene glycol as a reductant, polyvinylpyrrolidone (PVP) as a stabilizer, using a microwave technique. The products were characterized by transmission electron microscopy (TEM). The presence of sodium chloride in the polyol reduction of silver nitrate facilitated the production of silver nanowires. These wires were formed quickly (in approximately 3 minutes microwave heating). It was found that morphologies and sizes of silver nanostructures depended strongly on such experimental parameters as concentrations of PVP, NaCl, AgNO3, and heating time. The chloride ion was necessary to synthesize nanowire-shaped silver, and the sodium chloride likely controlled the rate of silver(I) reduction and initial seed formation.

N-vinyl pyrrolidone synthesis : Original content

POLYVINYL PYRROLIDONE K90, 9003-39-8, Laboratory Chemicals, (C6H9NO)n by Loba Chemie, India

Polyvinyl Pyrrolidone-Assisted Solvothermal Synthesis …

The exceptional properties of polymers containing the pyrrolidone functional group (aqueous & organic solvent soluble, high complexation ability, non-toxic and FDA approved) allow for wide-ranging product application. The development of pyrrolidone containing polymers is therefore, a highly interesting area for academic and commercial research. The focus of this project is the synthesis and characterisation of a range of novel pyrrolidone containing homo- and co-polymers. The work uses two approaches: 1) a bottom up, with the synthesis of known and novel pyrrolidone containing monomers and, 2) a top down, by functionalisation of commercially available polymer precursors.
A range of molecules containing the pyrrolidone moiety and monomer functional groups (styrene, epoxide and acrylate), were prepared. The homo- and co-polymerisation of the known and novel monomers, 1-(2-(oxiran-2-ylmethoxy) ethyl) pyrrolidin-2-one) or glycidyl ethylpyrrolidone (GEP, 1), 4-vinylbenzyloxy ethyl pyrrolidone (2) and 5-ethacryloxyethyl-12-ethylpyrrolidyl-N,N’hexane biscarbamate (3) were explored. The polymerisation methods were chosen to be synthetically simple, industrially viable and, were designed to produce pyrrolidone containing polymers with varying properties. The polymeric products were characterised by solution and solid state NMR, thermal analysis, mass spectrometry and, FTIR. GEP (1) was also successfully utilised in the post polymerisation modification of two commercial (poly(epichlorohydrin), poly(butadiene)) and one novel (poly(vinyl alcohol-graft-hyperbranched polyglycerol) (PVA-g-hPG)) polymer motifs.
The development, synthesis and characterisation of a range of novel pyrrolidone containing homo- and co-polymers is detailed herein. The success of the synthesis in an industrially viable manner provides a unique insight into the possibilities of pyrrolidone polymer progress.

Polyvinyl pyrrolidone-assisted synthesis of ..

Poly (vinyl alcohol) and poly (vinyl pyrrolidone) (PVA-PVP) blended hydrogel for wound
dressing has been prepared by using gamma rays irradiation technique

A series of hydrogels based on polyvinyl pyrrolidone (PVP)/κ-Carrageenan (KC) has been prepared by radiation technique.

PDF Downloads : Oriental Journal of Chemistry

The starting materials for the synthesis of ZnS nanoparticles were zinc acetate, poly--vinyl-2-pyrrolidone (PVP10), thioacetamide, and sodium sulfide. All chemicals were acquired from R&M Chemicals (Edmonton, AB, USA) or Sigma-Aldrich (Kuala Lumpur, Malaysia) and were analytical grade products, which were used without further purification.

:: NanoThailand 2012 ::Nanotechnology for the benefits …

Well-dispersed ZnS-NPs with narrow size distributions were prepared in a polyvinyl pyrrolidone polymeric solution via a simple, rapid and energy efficient microwave synthesis method. Since the majority of atoms in a nanoparticle are located on its surface, the modification of the nanoparticle’s surface has been recognized as the prime method to tailor nanomaterials for particular applications, with a high measure of control over the final product. Differences in the ZnS-NP size and dispersion were found to be polymer concentration dependant, as clearly visible upon TEM microscopic evaluation. Therefore, capping with a polymer, such as PVP, occurs via conjugation between PVP and the ZnS-NPs and not only offers enhanced colloidal stability, but also some measure of control over the size and the size distribution. The conjugation seems to occur via C–N and C=O groups, as confirmed via FTIR analysis. After introducing the polymer, both resonance C–N and C=O peaks in the FTIR spectra changed noticeably, which is indicatory for the coordination of ZnS-NPs with the N and O atoms of PVP. The optimal PVP concentration was determined to be ~5%, which resulted in a final product with an improved dispersion and relatively small size and size distribution. The average particle sizes and estimated optical band gaps of PVP-capped ZnS-NPs synthesized under optimal conditions are 5.1 nm and 4.07 eV for thioacetamide and 15.8 nm and 3.72 eV for sodium sulfide as sulfur sources. These results also indicate the significance of the sulfur source and thus the reaction mechanism on the final product.

Polymers and surfactants impact stability and long-term performance.