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Showing 1 to 20 of 669 for “"anionic"”.
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Anionic polymerization of a series of cyclocarbosiloxanes
<p>"A study has been made on the anionic polymerization of a series of cyclocarbosiloxanes of the type: [IMAGE] where n was varied from 2 to 8. The polymerization reaction in benzene, was initiated using cesium trihexyl silanolate, a unique organic soluble liquid catalysts. Benzene served as both a …
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The Rheology of Anionic Aqueous Polyurethane Dispersions
… We examine the rheological behavior of anionic aqueous polyurethane dispersions from the dilute to the concentrated regime. At dilute to intermediate concentrations these systems behave as standard electrostatically stabilized particles. However at higher concentrations, standard models …
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Studies in the anionic polymerization of methyl methacrylate
A study has been made of the anionic polymerization of methyl methacrylate using butyllithium and polystyryl lithium as initiators and using aluminium triisobutyl as a cocatalyst. The aspects of the polymerization that were examined were the effect of changing the order of addition of reagents, the …
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Novel microemulsions with an anionic/non-ionic surfactant mixture
Mikroemulsionen bestehen im einfachsten Fall aus Wasser, Öl und Tensid(en). Es handelt sich dabei im Gegensatz zu normalen Emulsionen um transparente, thermodynamisch stabile Phasen. Diesen makroskopisch einphasig erscheinenden Systemen liegen jedoch hoch komplexe Nanostrukturen zu Grunde. Die in …
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Synthesis of novel methacrylate-containing polymers by anionic polymerization
The advent of anionic "living" polymerization in the late 1950’s lead to developments in synthetic control not yet approached by other polymerization mechanisms. Parameters such as molecular weight, molecular weight distribution, stereochemistry, chain end functional groups, polymer architecture …
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Polymers with complex architectures by convergent living anionic polymerization
Includes bibliographical references.
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The polymerization of lactic acid anhydrosulphite by anionic initiators
… (lactic acid anhydrosulphite (LAAS)) using anionic initiators under various conditions. Poly(lactic acid) is a biodegradable polymer which finds many uses in biomedical applications such as drug-delivery and wound-support systems. For such applications it is desirable to produce polymers …
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An Anionic 3 + 2 Cyclization-Elimination Route to Cyclopentenes
… reagents in an anionic 3+2 cyclization-elimination route to cyclopentenes.
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Functional Block Copolymers via Anionic Polymerization for Electroactive Membranes
… for enhancing polymerization rates. Living anionic polymerization of 4-vinylbenzyl piperidine achieved novel piperidinyl-containing polymers. Homopolymer and copolymer architectures of this design offer structural integrity, and emphasize base stability. Sequential anionic polymerization …
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Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization
… (which has a functionalizable primary amine) via anionic ring-opening polymerization. By using this strategy, we describe: (i) the synthesis of thermally more stable fluorinated polyamide 6 having a hydrophobic surface; (ii) the synthesis of polyamides 6 bearing pendant cinnamoyl groups, which are …
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Anionic synthesis and characterization of alkyl methacrylate containing polymeric systems
The anionic synthesis of alkyl methacrylates has received sparse attention in comparison to the synthesis of nonpolar hydrocarbon monomers such as styrene or the dienes. The two major reasons for the sluggish synthetic development of this class of polar monomers are the protic impurities present in …
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Photoelectron circular dichroism of anionic chiral metal complexes and deprotonated molecules
Photoelectron circular dichroism (PECD) emerges as an asymmetry in the spatial distribution (regarding the light direction) of electrons detached from chiral molecules with left or right circular polarized light. In the past two decades PECD spectroscopy has manifested as a potential method for …
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Toxic Effects of an Anionic Detergent on the Gills of Trout
… is reviewed. The pathological effects of an anionic detergent, sodium lauryl sulphate, on the gills of rainbow trout have been studied by light and electron microscopy. At lethal concentrations up to about 120 mg/1, epithelial cell death is associated with lysosome formation. Acute …
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Bicarbonate Reversible Anionic Inhibition of the Quinone Reductase in Photosystem II
The HCO$\sb3\sp-$ anion regulates photosynthetic electron transport from H$\sb2$O to a Hill oxidant. HCO$\sb3\sp-$ depletion in the presence of inhibitory anions depresses the electron transport rates by as much as ten-fold. All the inhibitory effects of HCO$\sb3\sp-$ removal were found to be …
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Syntheses of Multi-headed, Two-tailed, Anionic Surfactants as Topical Microbicides
… of a series of multi-headed, two-tailed anionic surfactants (3CAm1(n)2) as anti-HIV microbicides, and to compare the biological activities of these compounds to the activities of their straight-acyl chain derivatives. The synthesis requires coupling reaction of dialkylacetic acid …
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Aqueous photoionization of anionic 2'-deoxythmidine-5'-phosphate, 2'-deoxyguanosine and tryptophan.
Aqueous photoionization of anionic 2'-deoxythmidine-5'-phosphate, 2'-deoxyguanosine and tryptophan.
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New block copolymers of Isobutylene by combination of cationic and anionic polymerizations
… of isobutylene by combination of cationic and anionic polymerizations, which are new materials with numerous promising potential applications. A new method for the synthesis of tailored polyisobutylene(PIB)-based block copolymer by combination of controlled / living cationic and anionic …
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The Synthesis of Anionic and Amine Containing Polymers for Potential Gas Separations
… via a condensation polymerization. With the anionic charges on the pendant groups of SPI, ionic liquids can be combined with SPI polymers by simple cation exchanges. In this study, four different imidazolium species (i.e., 1-n-butyl-3-methylimidazolium chloride, …
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