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Charge neutralization, polymeric

Charge neutralization, polymeric flocculation effect, 4-5 Colloid-polymer surface layers, electrical and hydrodynamic properties investigated with electro-optics, 121-135 Colloid stability, 161 Colloidal particles, polymer-induced attraction, 97... [Pg.283]

FAB SIMS in conjunction with charge neutralization utilizing mercury discharge lamp induced photoelectrons permits low-damage highly reproducible analysis of electrically insulating surfaces. Stable spectra can be obtained from polymeric materials such as polyethylene for periods of an hour or more. Minor spectrum differences between samples such as the various oxides of cobalt, which may have previously been due to thermal or surface potential effects, can now be more confidently assigned to compositional differences. [Pg.156]

Chemical polymerization methods are also available for preparation of functionalized conducting polymers. Several techniques are shown in Table 2. In these cases, all kinds of functional molecules (negatively charged, neutral, positively charged) can be incorporated. [Pg.654]

The polymerization of zwitterions can be considered to be a special case of such a termination reaction. This leads to a charge neutralization ( death charge polymerization ), giving uncharged polymers, and so must be distinguished from polymerization via zwitterions ... [Pg.647]

Cationic Polymers., The relation between zeta potential and flocculation by a polymer has been studied by Rjes (3IS), who pointed out that as soon as a colloidal particle is coated with polymer it bears the same charge as the polymer and is redispersed. Similar studies by Ries and Meyers (316) involved the use of microphoresis and electron microscope observations of model colloids and polymeric flocculants. Polyamine type flocculants appeared to extend out from the particle surface for a distance of 20-300 A. Flocculation occurs simultaneously through charge neutralization and bridging of polymer chains from particle to particle then excess polymer reverses the potential and redispersion occurs. Adsorption of poly [(1,2-dimethylvinylpyridinium) methylsulfate] on silica was similarly studied by Shyluk (317), who concluded that the polymer chains lay flat along the surface when no excess polymer was present. [Pg.393]

The rate of termination decreases with increasing acid strength of the counteranion (144). Counteranion stabilization by solvation will slow down termination by charge neutralization (145). Reversible termination by charge neutralization can lead to controlled carbocationic polymerization (see under Controlled Carbocationic Polymerization). [Pg.943]

When a difunctional trityl ion salt was used to initiate the living cationic polymerization of cyclopentadiene, block copolymers were formed through charge neutralization with living anionic ct-MS. By varying the functionality of the a-MS polymers, controlled block sequences were generated in the copolymers. [Pg.13]


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