Results 151 to 160 of about 7,549 (220)
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Chemical modification of styrene-divinylbenzene copolymers by dialkyl phosphites
Polymer, 1986Abstract Chloromethylated styrene-divinylbenzene copolymers were treated with dialkyl phosphites to obtain cation exchangers with phosphorus-containing acid groups. The gel and macroporous styrene-divinylbenzene (St-DVB) copolymers of Wofatit type were used. The influence of the phosphite (R=CH 3 , C 2 H 5 ) as well as of the copolymer structure (gel,
Romuald Bogoczek
exaly +3 more sources
Structure and properties of styrene-divinylbenzene copolymers
Polymer Bulletin, 1994The influence of binary mixtures of alcohols with different diluents on the porous structure of styrene-divinylbenzene (Sty-DVB) copolymers was investigated. Two series of binary mixtures were tested: one with isoamyl alcohol (1-AmA) and another with benzyl alcohol (BA). For systems containing 1-AmA, the hydrogen bonds between alcohol and polar solvent
D. Rabelo, F. M. B. Coutinho
semanticscholar +4 more sources
The formation and structure of suspension‐polymerized styrene–divinylbenzene copolymers
Journal of Applied Polymer Science, 1981AbstractPorous polymers were prepared by suspension copolymerization of styrene/divinylbenzene in various ratios together with various quantities of diluents, both solvating and nonsolvating. Parallel bulk polymerizations were made to detect the onset of gelation and phase separation.
G. J. Howard, C. A. Midgley
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Styrene–divinylbenzene copolymers: Influence of the diluent on network porosity
Journal of Applied Polymer Science, 1984The formation of the permanent porosity in the classical matrix, styrene–divinylbenzene copolymers, using cyclohexane, cyclohexanol, or cyclohexanone as diluent was studied. The data concerning porous networks were corroborated with the solvent–polymer interaction factor and the cohesive energy density which are important in the prediction of copolymer
Ig. C. Poinescu +2 more
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Styrene‐divinylbenzene copolymers, 3. Revisited IR analysis
Die Makromolekulare Chemie, 1981AbstractA critical analysis of the styrene‐divinylbenzene resin infra‐red spectra was made using previous works and new results. A method for the determination of pendent double bonds and also crosslinking degree and composition of the resin is drawn. A few examples of application are given.
Michel Bartholin +2 more
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Die Angewandte Makromolekulare Chemie, 1979
AbstractMacroporous styrene‐divinylbenzene resins are studied using precipitating agents as diluents. A definition of the macroporous domain is given, based on homogeneous properties and structures. The existence of this macroporous domain is proved to be a general feature of the macroporous resins field.
H. Jacobelli, M. Bartholin, A. Guyot
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AbstractMacroporous styrene‐divinylbenzene resins are studied using precipitating agents as diluents. A definition of the macroporous domain is given, based on homogeneous properties and structures. The existence of this macroporous domain is proved to be a general feature of the macroporous resins field.
H. Jacobelli, M. Bartholin, A. Guyot
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Scanning electron microscopy study of styrene-divinylbenzene copolymers
European Polymer Journal, 1992Abstract Styrene divinylbenzene copolymers have been synthesized by suspension polymerization in the presence of toluene and heptane as diluents for the monomers. The effects of toluene/heptane ratio, degree of dilution of the monomers and divinylbenzene(DVB) content on the surface formation of the copolymer beads were examined by scanning electron ...
F.M.B. Coutinho, D. Rabelo
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Mechanism of hypercrosslinking of chloromethylated styrene–divinylbenzene copolymers
Reactive and Functional Polymers, 1999Abstract Hypercrosslinked polymers are remarkable materials exhibiting extremely high apparent surface area and exceptional sorption properties. Their special morphology is a result of the fixation of expanded position of polymer chains in a good (swelling) solvent by methylene crosslinking bridges created by the Friedel–Crafts reaction of ...
Pavel Veverka, Karel Jeřábek
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Inhomogeneity of gel and microsyneresis in porous styrene‐divinylbenzene copolymers
British Polymer Journal, 1985AbstractThe porosity of styrene‐divinylbenzene copolymers prepared by suspension copolymerisation of the monomers carried out in the presence of inert diluent changes due to solvent pretreatment is investigated. The changes seem to reflect the inhomogeneity of copolymer gel.
Henryk Galina +3 more
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Neutral Styrene Divinylbenzene Copolymers for Adsorption of Toxins in Liver Failure
Biomacromolecules, 2008In artificial extracorporeal liver support systems, albumin-bound toxins such as bilirubin, bile acids, or aromatic amino acids are removed by adsorption to polymer beads. To overcome the potential weaknesses of anion exchange polymers currently used in liver support, namely, binding of heparin and activation of coagulation, we prepared two series of ...
Viktoria, Weber +5 more
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