4-Vinylpyridine polymer

In 2003, Bernini and coworkers established a method for converting some flavonoid ketones into the corresponding lactones with hydrogen peroxide as oxidant catalyzed by MTO supported on poly(4-vinylpyridine) polymers (equation 82) °. Conversions and... 

Demeftahi. M.V. Frechet, J.M.J. Study of the compatibility of blends of polymers and copolymers containing styrene, 4-hydroxystyrene and 4-vinylpyridine. Polymer 1988. 29. All. 

Aldrich Chemical Co., 1001 West St. Paul Avenue, Milwaukee, WI53233, USA Poly(4-vinylpyridine), 2% or 25% cross-linked Reilly Chemicals, SA, Rue Defacqz 115, Boite 19, B-1050 Brussels, Belgium Reillex cross-linked poly(4-vinylpyridine) polymers... 

Parker G and Hara M (1997) Poly(p-phenylene terephthalamide)s (PPTAs) having ionic and nonionic side groups and their blends with poly(4-vinylpyridine). Polymer 38 2773-2780. 

Pergushov, D.V., Remizova, E.V., Gradzielski, M., Lindner, P., Feldthusen, J., Zezin, A.B., Muller, A.H.E. and Kabanov, V.A. (2004) Micelles of polyisobutylene-block-poly(methacrylic acid) diblock copolymers and their water-soluble interpolyelectrolyte complexes formed with quaternized poly(4 vinylpyridine). Polymer, 45, 367-378. 

Pergushov DV et al. Micelles of polyisobutylene-block-poly(methacrylic acid) diblock copolymers and their water-soluble interpolyelectrolyte complexes formed with quat-emized poly(4-vinylpyridine). Polymer 2004 45(2) 367-378. 

Molecular weights of polymers that function as bridging agents between particles are ca 10 —10. Ionic copolymers of acrylamide are the most significant commercially (see Acrylamide POLYMERS). Cationic comonomers include (2-methacryloyloxyethyl)trimethylammonium salts, diethyl aminoethyl methacrylate [105-16-8], and dimethyldiallylammonium chloride [7398-69-8], anionic comonomers include acryUc acid [79-10-7] and its salts. Both types of polyacrylamides, but especially the anionic, can be more effective in the presence of alum (10,11). Polyetbylenimine and vinylpyridine polymers, eg, po1y(1,2-dimethy1-5-viny1pyridiniiim methyl sulfa te) [27056-62-8] are effective but are used less frequentiy. 

Sabitha G, Reddy KB, Yadav JS, Shailaja D, Sivudu KS (2005) Ceria/vinylpyridine polymer nanocomposite an ecofriendly catalyst for the synthesis of 3,4-dihydropyrimidin-2(lH)-ones. Tetrahedron Lett 46 8221-8224... 

In the limonene oxidation reaction, various immobilized systems have been tested as catalyst. The use of MTO supported on poly(vinylpyridine) polymers however turned out to be a poor system for the limonene oxidation since both the conversions and the selectivities were quite a bit lower than the optimal non-immobilized system [56]. These systems were also used in combination with ionic liquids, and here, a similar result as with the non-immobilized system was found, yielding mostly diepoxide, with the best-performing catalyst MTO/PVP-25% in [BMIM][BF4], giving 92% of diepoxide at full conversion [61]. 

Pyridylbenzimidazoles with a two-carbon alkyl chain separating the benzimidazole and pyridine components (229 and 230, = 2) should not be influenced by the presence of the two rings, since they are separated by a sufficient distance. Still, treatment of either compound with sodium amide under mild conditions (xylene or DMA, 110-115°C, 2 hr) gave recovered starting material, while under harsher treatment (150-170°C, 10 hr) decomposition to benzimidazole and resinous products (probably vinylpyridine polymer) was observed (72CHE1131). 

An acid cyclodextrin D-glucanotransferase from an alkalophilic Bacillus sp. exhibits a specificity similar to those of the transferases from B. circulans and B. macerans, although different proportions of cyclohexa-, cyclohepta-, and cyclo-octa-amyloses are formed. The cyclodextrin D-glucanotransferase from an alkalophilic Bacillus sp. has been used, either alone or in combination with pullul-anase, to produce cyclohepta-amylose. A succinylated derivative of this cyclodextrin D-glucanotransferase has been immobilized, with retention of activity, by adsorption onto a vinylpyridine polymer. 

The swelling and the swollen-state morphology of the vinylpyridine polymers was studied by (ISEC) in tetrahydrofuran (THF) [25,26]. Figure 9.2 compares swollen-... 

The simplest case is the preparation of homopolymer brushes. For example, PNIPAM brushes have been developed for cantilever actuation and the detection of changes in solvent type, temperature and pH, promising great potential for sensing applications in nucrofluidic devices (Abu-Lail et al., 2006 Qing and Sun, 2011). Tokareva et al (2004) prepared a novel sensor for pH detection based on poly(2-vinylpyridine) polymer brushes which detected a change in pH from 5 to 2. 

Poly(2-vinyl pyridine) 2-Vinylpyridine polymer 25014-15-7 Pyridine, 2-ethenyl-, homopoiymer R (C7H7N),... 

Copolymerization can be carried out with styrene, acetonitrile, vinyl chloride, methyl acrylate, vinylpyridines, 2-vinylfurans, and so forth. The addition of 2-substituted thiazoles to different dienes or mixtures of dienes with other vinyl compounds often increases the rate of polymeriza tion and improves the tensile strength and the rate of cure of the final polymers. This allows vulcanization at lower temperature, or with reduced amounts of accelerators and vulcanizing agents. 

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