Results 141 to 150 of about 7,965 (193)
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Applied Catalysis A: General, 2008
Ion-exchange resins based on styrene (S) and divinylbenzene (DVB) were prepared by aqueous suspension polymerization using toluene and n-heptane as diluents for the monomers. The different morphological structures were characterized by surface area, pore volume, optical appearance and surface morphology.
Simone M. de Rezende +6 more
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Ion-exchange resins based on styrene (S) and divinylbenzene (DVB) were prepared by aqueous suspension polymerization using toluene and n-heptane as diluents for the monomers. The different morphological structures were characterized by surface area, pore volume, optical appearance and surface morphology.
Simone M. de Rezende +6 more
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Journal of Environmental Management, 2015
Treatment of the oily wastewater from crude oil extraction is a growing challenge due to rising concern for the environment. Polyaromatic hydrocarbons (PAHs) deserve special attention because of their high toxicity. There is a need to develop processes able to minimize the discharge of these compounds and analytic techniques to monitor the levels of ...
Carla M F, da Silva +4 more
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Treatment of the oily wastewater from crude oil extraction is a growing challenge due to rising concern for the environment. Polyaromatic hydrocarbons (PAHs) deserve special attention because of their high toxicity. There is a need to develop processes able to minimize the discharge of these compounds and analytic techniques to monitor the levels of ...
Carla M F, da Silva +4 more
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Kinetics of the polymerization of divinylbenzene isomers
Journal of Polymer Science Part A: General Papers, 1964AbstractThe overall rates of polymerization of m‐ and p‐divinylbenzene, a 2:1 mixture of the meta and para isomers, and commercial divinylbenzene have been followed viscometrically. Data at 60 and 80°C. show that the meta isomer polymerizes most rapidly. Ratios of rates show differences in activation energies.
Richard H. Wiley, Giovanni Devenuto
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Coating of poly(styrene-co-divinylbenzene) beads with copolymer of styrene and divinylbenzene
European Polymer Journal, 1984Abstract The production of beads with cross-link density varying from the centre to the surface is described.
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Heterogeneities of styrene-divinylbenzene-copolymers
Polymer Bulletin, 1989The heterogeneity of copolymers of styrene and divinylbenzene was investigated. The distribution of divinylbenzene units within the crosslinked copolymer yields information about the inhomogeneity of the network formed. Proceeding from the monomer reactivity ratios, the monomer compositions and from the conversion we set up histogramms of the ...
Gerhard Schwachula, Georgi Popov
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Die Makromolekulare Chemie, 1986
AbstractThis paper presents results of the studies on the mechanism of initiation, propagation and chain transfer reactions in the recently found polymerization of 1,4‐ and/or 1,3‐divinylbenzene (DVB), initiated with lithium diisopropylamide/diisopropylamine. Initiation was confirmed to take place by addition reaction of the alkylamino group to the DVB
Yukio Nagasaki +2 more
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AbstractThis paper presents results of the studies on the mechanism of initiation, propagation and chain transfer reactions in the recently found polymerization of 1,4‐ and/or 1,3‐divinylbenzene (DVB), initiated with lithium diisopropylamide/diisopropylamine. Initiation was confirmed to take place by addition reaction of the alkylamino group to the DVB
Yukio Nagasaki +2 more
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Properties of fractal divinylbenzene microgels
Macromolecules, 1991Microgels synthesized via radical copolymerization of styrene and 10 mol% divinylbenzene in an inert solvent have been characterized with GPC, viscometry, light scattering, SANS and dynamic mechanical shear experiments. These systems, when synthesized slightly below the critical transition from micro- to macrogelation, exhibit a scalable behavior of ...
Antonietti, M., Rosenauer, C.
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Cytogenetic effects in mice of divinylbenzene-55 inhalation
Mutation Research/Genetic Toxicology, 1996Male B6C3F1 mice (8 weeks of age) were exposed by inhalation to divinylbenzene-55 (DVB-55), at target concentrations of 0, 25, 50 and 75 ppm for 6 h per day for 3 days. Following exposure the animals were killed blood smears were prepared for micronucleus (MN) analysis, and the spleens were removed and cultured for sister chromatid exchange (SCE) and ...
A D, Kligerman +4 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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Journal of Polymer Science: Polymer Chemistry Edition, 1984
AbstractPoly(divinylbenzene) [poly(DVB)] derivatives having hydroxyl terminals and/or pendants were synthesized by chemical modifications (hydration and hydroxylation) of unsaturated linear poly(DVB) (I), which was prepared by the polymerization of DVB catalyzed by acetyl perchlorate.
Sadahito Aoshima, Toshinobu Higashimura
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AbstractPoly(divinylbenzene) [poly(DVB)] derivatives having hydroxyl terminals and/or pendants were synthesized by chemical modifications (hydration and hydroxylation) of unsaturated linear poly(DVB) (I), which was prepared by the polymerization of DVB catalyzed by acetyl perchlorate.
Sadahito Aoshima, Toshinobu Higashimura
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