Results 151 to 160 of about 3,151 (181)
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Synthesis of porous styrene divinylbenzene copolymers
Die Angewandte Makromolekulare Chemie, 1985AbstractThe copolymerization of styrene with divinylbenzene in the presence of tri‐n‐butylphosphate or a mixture of di‐2‐ethylhexylphosphoric acid and chlorobenzene was studied in order to perform porous networks, solvent impregnated copolymers, etc. The diluents behave as strong precipitants allowing to prepare permanent porous copolymers having low ...
Ignat Poinescu +2 more
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Scanning electron microscopy of styrene-divinylbenzene copolymers
Polymer Bulletin, 1995Styrene-divinylbenzene copolymers were synthesized by suspension polymerization in presence of di(2-ethylhexyl) phosphoric acid and methyl ketone as diluents. The surface and bulk morphology of the beads were investigated through scanning electron microscopy. The influence of diluent-copolymer interaction, dilution degree and interfacial tension on the
D. Rabelo +3 more
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Kinetics of devitrification of styrene‐divinylbenzene copolymers
Die Angewandte Makromolekulare Chemie, 1984AbstractThe dependence of glass temperature on the heating rate for styrene‐divinylbenzene solvent modified network copolymers has been investigated by differential scanning calorimetry. The McMillan equation has been utilized to determine apparent activation energies of vitrification.
Marek Eder +2 more
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Swelling of porous styrene-divinylbenzene copolymers in water
Journal of Applied Polymer Science, 2000The swelling capacity of porous styrene-divinylbenzene (DVB) copolymers in water was studied by displacing methanol from the swollen polymer. The copolymers with different amounts of DVB were prepared in the presence of solvents with different solvating powers as inert diluents.
Jun Yan, Xunhua Wang, Jiaqi Chen
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Surface sulphonated highly crosslinked styrene‐divinylbenzene copolymers
Die Angewandte Makromolekulare Chemie, 1988AbstractA series of surface sulphonated macroporous styrene‐divinylbenzene (S‐DVB) copolymers containing various amounts of —SO3H groups was obtained. Porous structure, surface hydrophilicity and polarity, and sorption properties of these copolymers as well as those of starting S‐DVB resin towards some substances which are present in blood were ...
Boz̊ena N. Kolarz +2 more
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The swelling of filled styrene-divinylbenzene copolymers
Polymer Science U.S.S.R., 1966IT IS now known that the addition of fillers to polymers, especially rubbers, results in additional network formation. In our earlier studies [1-3] we examined the effect of a filler on structure formation in thermoplastic polymers. Study of the special features of structure formation in the case where formation of the polymer takes place ...
Yu.S. Lipatov, L.M. Sergeyeva
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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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Styrene–divinylbenzene copolymers post-crosslinked with tetrachloromethane
Polymer, 1998Abstract This paper describes a method of preparation of permanently porous functionalized styrene copolymers by the chemical transformation of gel or macroporous styrene–divinylbenzene copolymers. As a crosslinker, tetrachloromethane was used in the presence of a Friedel–Crafts catalyst (aluminium or ferric chloride).
J Hradil, E Králová
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Fluorinated styrene divinylbenzene copolymer as catalyst support
Applied Catalysis, 1991Abstract Styrene divinylbenzene copolymer (SDB) is an inert high surface area material suitable for supporting noble metal catalysts. Because SDB is hydrophobic, the resulting catalysts are free from capillary condensation and remain active in the presence of water. Although SDB supported catalysts are stable at moderate temperatures, it is desirable
J.J. Wu, L. Fu, K.T. Chuang
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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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