Poly dimethylammonium

Poly-3-chloro-2-hydroxypropylmethacryl-oxyethyl dimethylammonium Chloride 1.0-5.0 Polysciences, Warrington, PA... 

Poly- 3 - chloro -2 -hydroxypropylmeth acryloxyethyl dimethylammonium chloride, Polysciences 0/0/0 R/R/R -... 

Poly-3-chloro-2-hydroxypropyl-methacryloxyethyl dimethylammonium Chloride 14 22... 

Carrageenan (X) Poly(3-chloro-2-hydroxypropyl- methacryloxyethyl-dimethylammonium Chloride) R/F C/L I/P M/H M/M... 

Gold nanoparticles can also be stabilized using polymers that do not have specific functional groups through physisorption. Among the possible stabilizers, the polymers used most often to stabilize Au NPs are the water soluble polymers poly(N-vinylpyrrolidone) (PVP), polyethylene glycol) (PEG), poly(vinyl pyridine), poly(vinyl alcohol) (PVA), poly(vinyl methyl ether) (PVME), and polyelectrolytes such as PAA, chitosan, polyethyleneimine (PEI) or poly(diallyl dimethylammonium) chloride (PDDA) [99]. 

Later, similar experiments were made for cationic networks of poly(diallyl-dimethylammonium bromide) in the presence of sodium dodecyl sul te or potassium salts of carboxylic acids with different lengths of hydrocarbon groups [66-68]. 

Recent investigations of a polyelectrolyte complex of 31 and poly(diallyl-dimethylammonium) chloride 29 have shown that although photoisomerization is unrestricted in the LBK films, some mechanical stress is built up in the films upon traits to cis isomerization. This was established by AFM, which shows reversible morphological changes. On irradiation, a number of protrusions with a height of ca. 5 nm appeared on the surface. These structures... 

FIG. 7 Ionic strength (7) dependence of the protein global charge at the onset of complexation (Zpr)c in bovine serum albumin and polyelectrolyte mixtures (type 1 titrations). PMAPTAC poly(acrylamidopropyl trimethylammonium) chloride PAMPS poly(acrylamido methylpropylsulfonate) PAMPS(8) copolymer of AMPS and 20 mol% acrylamide PDADMAC poly(diallyl dimethylammonium) chloride. (Reprinted with permission from Ref. 22. Copyright 1998 American Chemical Society.)... 

Synthesis and graft copolymerization of poly(diallyl dimethylammonium chloride) with acrylamide [127],... 

S. Knop, H. Thielking, and W. -M. Kulicke, Simplex membranes of sulphoethyl-cellulose and poly(diallyl-dimethylammonium chloride) for the pervaporation of water-alcohol mixtures, J. Appl. Polym. Sci., 77 (2000) 3169-3177. 

Polymeric betaines or zwitterions are polyampholytes whose oppositely charged groups remote one from another are displaced on one pendant substituent. There are several types of monomers with a betaine structure carboxy-betaines, sulfobetaines and phosphobetaines. Poly-hT-ethyleneglycine (1), po-ly(N-3-sulfopropyl)-W-methacryloyloxyethyl-Nd -dimethylammonium betaine) (2) and poly[(2-methacryloyloxyethyl-2-(trimethylammonioethyl-phosphate)] (3) are typical examples of this kind of polyampholyte ... 

Iable16. Hydrodynamic and Molecular Characteristics of Poly(M-3-sulfopropyl)-M-meth-acryloyloxyethyl-iVAi-dimethylammonium betaine) in Water-Salt Solutions ... 

Poly (melamine-co-formaldehyde), methylated. See Melamine-formaldehyde resin, methylated Poly (melamine-co-formaldehyde), methylated/butylated. See Melamine-formaldehyde resin, methylated-butylated Polymene AZ. See PEG castor oil Polymer C . See Polypropylene Polymer SBOCP. See Cocamidopropyl dimethylammonium C8-16 isoalkylsuccinyl lactoglobulin sulfonate Polymer Additive GH. See Polyoxyisobutylene/methylene urea copolymer Polymeric biuret of HDI Polymeric HDI Polymeric HMDI. See Hexamethylene diisocyanate biuret Polymeric MDI... 

Special attention deserves Nafion layered membrane prepared by the LBL self assembly of polyelectrolytes [25, 167-171]. A high selectivity membrane was prepared by Tang et al. [25] by self-assembling multi-layer Pd nanoparticles onto Nafion, using poly(diallyl dimethylammonium chloride) (PDAC) for charging the Pd particles. A Nafion 112 membrane was immersed in a Pd/PDDA dispersion and then in a Nafion dispersion. The process was repeated five times to obtain a multilayer self-assembly Nafion composite that shows a small decrease in conductivity (from 112 mS.cm for Nafion 112 to 81 mS.cm for the composite). However, the reported methanol permeability was reduced by a factor 0.0085 (out of scale in Fig. 6.22), leading to k 85. This composite membrane, whose strucmre is depicted in Fig. 6.24, was not tested in a DMFC. 

McCormick et al. (2003) studied the structure and dynamics of adsorbed water and polymer components in PEM films and the bulk PEC using H MAS NMR spectroscopy. The films (1-5 bilayers) with poly(diallyl dimethylammonium chloride) (PDADMAC) and poly(sodium-4-styrenesulfonate) (PSS) were adsorbed onto colloidal silica particles. Relaxation and line width measurements showed that the adsorbed water is less mobile in the films than in the analogous PEC. This result can be explained by compacting of the adsorption layer at a surface and enhancement of confined space effects for bound water. Relaxation measurements and H double-quantum (DQ) NMR experiments revealed that polymer dynamics in the PEMs was strongly influenced by the layer number and water content (Eigures 5.18 and 5.19). 2D spin... 

Cl quadrupole relaxation studies of Cl binding to synthetic polycations and polyampholytes have recently been started [525] and, furthermore, observations of Cl NMR in polyanion (poly(phosphate) and poly(methacrylic acid)) solutions have been reported [526 527]. In Fig. 10.1 are shown the Cl transverse relaxation rates (from line widths of Fourier transform spectra) for solutions of poly(N,N-dimethyl-aminoethylmethacrylate) and poly(methacrylic acid) as a function of the degree of ionization, a, of the polyelectrolyte [525]. (a = 0 corresponds to equivalent concentrations of acid and polymer and a = 1 to equivalent concentrations of base and polymer.) The Cl interaction with the polycation can be seen to have a considerable effect on the relaxation rate the linear decrease for intermediate a-values reflects the gradual titration of the dimethylammonium groups. Quadrupole relaxation studies seem to be well suited for elucidating halide ion -... 

In the case of polymer/clay nanocomposites, alkylammonium exchange species influence the affinity between the polymer and the clay surface. For example, it was reported that clays treated with dialkyl dimethylammonium halides, in particular with two chains of about 18 carbon atoms, have a surface energy similar to poly(olefins) such as polypropylene (PP) and polyethylene (PE) [27]. Polar polymers as polyamides (PA) have been recommended to get better interactions as reported by Toyota [8]. The alkyl chain length is related with increase in interlayer space required for the intercalation of polymer chains. Because of the nonpolar nature of their chains, they reduce the electrostatic interactions between the silicate layers and lower the surface energy of the layered silicates. As a consequence, an optimal diffusion of the polymer to dissociate the stacked clay layers, that is, an exfoliation process, can be obtained. Despite the compatibility of MMT modified by long alkyl chain quaternary ammonium with hydrophobic polymers (PE and PP), conventional alkylammonium ions show low thermal stability, that is, an onset decomposition temperature is close to 180°C.This poor thermal stability could limit their use in the preparation of PLS with matrices processed at high temperatures such as PA, poly(ethylene terephthalate) (PET), and poly(ether ether ketone) (PEEK) [30]. 

Schmidt B, Wandrey C, Freitag R. Investigation of particle-based and monolithic columns for cation exchange protein displacement chromatography using poly (diallyl-dimethylammonium chloride) as displacer, J Chromatogr A 2003 1018 155-67. 

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