Polyacrylic acid-polyethyleneimine

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. 

The first section, Chemical Reactions on Polymers, deals with aspects of chemical reactions occurring on polymers—aspects relating to polymer size, shape, and composition are described in detail. One of the timely fields of applications comprises the use of modified polymers as catalysts (such as the immobilization of centers for homogeneous catalysis). This topic is considered in detail in Chapters 2, 3, 8, 9, and 11 and dealt with to a lesser extent in other chapters. The use of models and neighboring group effect(s) is described in detail. The modification of polymers for chemical and physical change is also described in detail in Chapters 2 (polystyrene) 4 (polyvinyl chloride) 5 (polyacrylic acid, polyvinyl alcohol, polyethyleneimine, and polyacrylamide) 6 (polyimides) 7 (polyvinyl alcohol) 8 (polystyrene sulfonate and polyvinylphosphonate) 10 (polyacrylamide) and 12 (organotin carboxylates). 

Fig. 11 Scheme of layer-by-layer assembly of polyelectrolytes on activated porous supporting membrane. The separation layer is obtained upon multiple repetition of steps A and B. In reality, pore diameters are 20 to 200 nm, polymer chains are less ordered and partially overlapping. Polyelectrolytes PVA, poly(vinylamine) PAH, poly(allylamine hydrochloride) PEP, polyethyleneimine (branched), P4VP, poly(4-vinylpyridine) PDADMA, poly(diallyldimethylammonium chloride) PVS, poly(vinylsulfate) PVSu, poly(vinylsulfonate) PSS, poly(styrenesulfonate) PAA, polyacrylic acid DEX, dextran sulfate (from Ref. [70])... 

The first of our preliminary results we demonstrate here is mass sensitivity. To do this we use a polyelectrolyte multilayer layer-by-layer deposition technique. Briefly, multilayers of polyethyleneimine and polyacrylic acid were deposited on the glutaraldehyde functionalized NOSA device, and on similarly functionalized silicon wafers in parallel. After deposition of each layer, output spectra were recorded to quantify shift in resonant wavelengths and polyelectrolyte multilayer film thickness was determined on silicon wafers using ellipsometry. Output spectra were compared to the initial baseline spectra to determine resonance shift (AA, in mn), and were plotted against film thickness as shown in Fig. 2. 

In-situ ATR FTIR spectroscopy was used to study the interaction between the differently charged model proteins human serum albumin, lysozyme, immunoglobulin G and multilayer assemblies, which were deposited by alternating adsorption of polyethyleneimine and polyacrylic acid onto silicon crystals. Low adsorbed protein amounts were observed if the top polyelectrolyte layer and the protein were equally charged, whereas enhanced protein adsorption occurred for electrostatic attraction between protein and top polyelectrolyte layer. 18 refs. 

N nonwoven, S single, O oriented, PAA polyacrylic acid, PVA polyvinyl alcohol, PEI polyethyleneimine, HCSA 10-camphorsulfonic acid, PAN/polyaniline, PEO poly(ethylene oxide), PDPA polydiphenylamine, PMMA polymethyl methacrylate, POT poly-o-toluidine, PS polystyrene, MWCNT multiwalled carbon nanotube, CB carbon black, PECH polyepichlorohydrin, PIB polyisobutylene, PVP polyvinylpyrrolidone, PAN polyacrylonitrile, VOC volatile organic... 

The addition of a second polyion of the opposite charge leads to the formation of p>olyanion/ polycation-complexes, which are less soluble in water and usually precipitate. At least one example has been published in which a Cibacron blue conjugated polycation (polyethyleneimine) was used to capture lactate dehydrogenase, followed by precipitation through complex formation with polyacrylic acid. ... 

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