Polyvinylpyrrolidones

Yamakoshi Y N, Yagami T, Fukuhara K, Sueyoshi S and Miyata N 1994 Solubilization of fullerenes into water with polyvinylpyrrolidone applioable to biologioal tests J. Chem. Soc., Chem. Common. 517-18... 

Table 11. Swelling of Cross-linked Polyvinylpyrrolidone in Various Liquids at 20°C...

B. V. Robinson and co-workers, PUP, M Critical Keview of the Kinetics and Toxicology of Polyvinylpyrrolidone (Povidone), Lewis, Chelsea, Mich., 1990. 

PROPERTIES AND USE IN ANALYSIS OF WATER-SOLUBLE POLYMER - POLYVINYLPYRROLIDONE... 

Polyvinylpyrrolidone (PVP) is water-soluble polymer, whieh is widely used in various industries and agrieulture beeause of high inelination to the eomplex formation and eapaeity to stabilization of different systems. 

Last years the polymeric surface - active substances began to use as modifiers of organic reagent properties. In our work the behavior of synthetic polymers (polysulphonilpiperidinilmethylenhydroxide (PSPMH), polyvinylpyrrolidone (PVP), polyamines - polyguanidine and metacide) and natural polymers (starch, gelatin) for various molecular masses are investigated. 

Nonionic hydrophobic Polyvinylpyrrolidone Buffer or salt solution with organic solvent (e.g., 20% CH,CN in 0.1 M NaNOd... 

Eigure 6.24 shows the chromatogram of polyvinylpyrrolidone. Although PVP is slightly hydrophobic, GPC elution can be achieved by adding acetonitrile in the eluent. 

Nonionic, hydrophobic Polyvinylpyrrolidone 0.1—3 M salt/buffer with 20% methanol... 

COMPARISON OF FOUR COMMERCIAL LINEAR AQUEOUS SIZE EXCLUSION COLUMNS AND FOUR SETS OF COMMERCIAL POLYETHYLENE OXIDE (PEO) STANDARDS FOR AQUEOUS SIZE EXCLUSION CHROMATOGRAPHY OF POLYVINYLPYRROLIDONE AND PEO... 

The purpose of this study is twofold to compare four linear aqueous SEC columns made by Tosoh and Showa Denko in terms of composition and performance and to evaluate the effect of commercial PEO standards on the accuracy and precision of the MW and MWD of polyvinylpyrrolidone (PVP) and NIST PEO standards. In terms of performance, emphasis will be placed on factors not commonly covered by column manufacturers. Successful SEC conditions for PVP in water, in water/methanol, and in dimethylformamide can be found in the literature (8,9,10). This study deals mainly with the effects of column, mobile phase, and PEO standards on the MW and MWD of PVP. 

C. Effect of PEO Calibration Standards and Columns on the Molecular Weight and Polydispersity of Polyvinylpyrrolidone (PVP)... 

It is surprising to note that for all four columns there is good agreement between the M determined in water and in water/methanol, despite the fact that PEO and polyvinylpyrrolidone have different hydrodynamic volumes in these two mobile phases and that the column packings may swell or shrink differently in these two mobile phases. 

Examples shown in this chapter are for PMMA. Other polymers can be separated as well. The polymers separated so far (1,2) include polystyrene, poly(a-methylstyrene), polycaprolactone, polycarbonate, poly(hexyl isocyanate), polytetrahydrofuran, poly (vinyl methyl ether), and polyvinylpyrrolidone. 

ACPA azobis(4-cyanopentanoic acid) AIBN azobis isobutyronitrile) BPO benzoyl peroxide DVB divinyl benzene, EGA 2-ethylcyano-acrylate HPC hydroxypropyl cellulose MMA methyl methacrylate PAAc polyacrylic acid PEI polyethyleneimine, PEO/PPO polyethylene oxide/polypyropylene oxide copolymer PVME polyvinylmethylether PVP polyvinylpyrrolidone K-30 DMSO dimethylsulfoxide PGA polyglutaraldehyde CMS chloromethylstyrene PMMA-g-OSA polymethylmethacrylate grafted oligostearic acid. 

In the polymerization of St initiated with type II MAI composed of polyvinylpyrrolidone (PVP), block efficiency was kept to 80% when feed concentration was above 3 mol/L, but it drastically decreased below 3 mol/ L (Fig. 2) [36,37]. AIBN, the typical low-molecular weight azo initiator, shows a drastic decrease in its initiation efficiency below a critical feed monomer concentration, i.e., 0.5 mol/L. In the case of MAI, it seems that a similar decrease in initiation efficiency occurs at much higher critical monomer concentration due to immobility of macroinitiating radicals. 

A23187-Methyl ester and polyvinylpyrrolidone Hydroxylation 16-Hydroxylated (and N-de methylated) products Streptomyces chartreusis... 

Madden, P.W., Taylor, M.J., Hunt, C.J., Pegg, D.E. (1993). The effect of polyvinylpyrrolidone and the cooling rate during corneal cryopreservation. Cryobiol. 30, 135-157. 

The compounds 12,14 and 15 can be prepared from parent lysergic acid amides by bromination with NBS or PHT, but not the compounds of the type 12. The latter structure is very sensitive and under these circumstances only degradation products were obtained. Besides it was necessary to use much milder reagent, e.g. bromine bonded onto polymeric matrix with polyvinylpyrrolidone or polyvinylpyridine structure (29) ... 

Capryloamphoglycinate, cocoamphodiacetate, disodium cocoamphodiacetate, lauroamphoacetate, sodium capryloamphohydroxypropyl sulfonate, sodium mixed Cg amphocarboxylate, and alkylamphohydroxypropyl sulfonate Polyvinylpyrrolidone, polyvinyl alcohol, starches, cellulosic material, or partially hydrolyzed polyacrylamide, and polypropylene glycol, or a betaine [43]... 

Modified amino acids such as N-acyl-dehydroalanine polymers and copolymers with N-vinyl-N-methyl acetamide seem to be particularly effective [396]. The crystallization kinetics in the presence of polyvinylpyrrolidone and tyrosine have been tested by time-resolved experiments [981]. An influence is evident on the particle size distribution of the hydrate [1433]. 

Figure 1 The effect of product temperature on primary drying time. 5% (v/v) solute cake depth of 1 cm. ( ) KC1 (A) povidone (polyvinylpyrrolidone). (From Ref. 1.)...

Wu YD, Wang LS, Xiao MW, Huang XJ (2008) A novel sonochemical synthesis and nanostructured assembly of polyvinylpyrrolidone-capped CdS colloidal nanoparticles. J Non-Cryst Solid 354(26) 2993-3000... 

HDZ = hydrazine Igepal CO-520 = polyoxyethylene(5)nonylphenyl ether ISO = isooctane LAc = linoleic acid MA = methylamine MST = mesitylene Ni°(cod)2 = bis (r]4-l,5-cyclooctadiene) Ni(0) NMPyr = N-methylpyrrole OA = oleylamine OAc = oleic acid Oc = octane OcA = octylamine ODA = octadecylamine PAA = poly (acrylic add) PD = 2-pyrrolidone Igepal CA-520 = polyoxyethylene(5)isooctylphenyl ether PVP = polyvinylpyrrolidone Pyr = pyrrole RAc = ricinoleic acid ... 

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