Polystyrene-co-divinylbenzene

FIGURE 16.15 The principle of the magic triangle [261] that depicts the desirable symmetricity of the SEC system. The symmetric example (------) polystyrene-co-divinylbenzene (PS/DVB) column packing, poly-... 

Figure 8.2. SEM analysis of PS-DVB (polystyrene-co-divinylbenzene) microspheres prepared by two-step microsuspension polymerization method, particle diameter 2-20 pm (39).

Macroreticular Resins. Polymerization of linear polymers with bifunctional monomers added during the reaction produces a reticulated structure that is similar to a macroporous sponge. Typical macroreticular polymers in this class are polymethyl methacrylate-co-ethylene dimethoacrylate and polystyrene-co-divinylbenzene. Substitution of polar groups in the monomers enables ion-exchange resins to be produced, such as polystyrenesulphonate. 

Polystyrene-co-butylacrylate, 7 608t Poly (styrene-co-divinylbenzene), 73 113 Poly(styrene-co-vinylpyridinium methyl iodide) ionomer system, 74 480 Poly(styrenedivinylbenzene) (PSDVB) liquid chromatography stationary phase, 4 623... 

Recent chromatographic data indicate that the interactions between the hydrophobic surface of a molded poly(styrene-co-divinylbenzene) monolith and solutes such as alkylbenzenes do not differ from those observed with beads under similar chromatographic conditions [67]. The average retention increase, which reflects the contribution of one methylene group to the overall retention of a particular solute, has a value of 1.42. This value is close to that published in the literature for typical polystyrene-based beads [115]. However, the efficiency of the monolithic polymer column is only about 13,000 plates/m for the isocratic separation of three alkylbenzenes. This value is much lower than the efficiencies of typical columns packed with small beads. 

Fig. 14 a, b. Effect of gradient steepness on the very fast separation of polystyrene standards in a molded monolithic poly(styrene-co-divinylbenzene) column (Reprinted with permission from [121]. Copyright 1996 Elsevier). Conditions column, 50 mm x8 mm i.d., mobile phase, linear gradient from 100% methanol to 100% tetrahydrofuran within a 1 min b 12 s, flow rate, 20 ml/min, peaks represent polystyrene standards with molecular weights of 9200,34,000 and 980,000 (order of elution), 3 mg/ml of each standard in tetrahydrofuran, injection volume 20 pi, UV detection, 254 nm... 

When the Cu(II) complex of cyclen (AE) was attached to cross-linked polystyrene, the proteolytic activity of the Cu(II) complex of cyclen was enhanced remarkably (111). Poly(chloromethylstyrene-co-divinylbenzene) (PCD) was prepared as a derivative of polystyrene in which all of the styryl residues contained chloromethyl groups. By the substitution of chloro groups of PCD with various nucleophiles, PCD derivative BA was prepared. y-Globulin was hydrolyzed upon incubation with BA, whose half-life was as short as 1 h at 25°C and pH 7 in the presence of excess BA. The rates for hydrolysis of y-globulin by the Cu(II) complex of cyclen itself dissolved in water were also measured. Comparison of rate data collected at the same catalyst concentrations revealed that the proteolytic activity of the Cu(II) complex of cyclen was... 

The most extensively used macroporous resins are polystyrene-based ion-exchange resins. They are made of poly(styrene-co-divinylbenzene) with subsequent modification to arylsulphonic acids, quaternary ammonium salts or other derivatives mainly located on the internal surface of the pores [33,34]. This renders them accessible to munerous organic solvents including water and alcohols. Recently, these ion-exchange resins have had a revival for the immo-biUsation of ionic reagents [31,32] in automated synthesis. Macroporous beads have also been used for the immobihsation of catalysts [5,7] however, leach-... 

Poly (styrene-co-acrylonitrile). See Styrene/acrylonitrile copolymer Poly (styrene-co-allyl alcohol). See Styrene/allyl alcohol copolymer Poly (styrene-co-butadiene). See Styrene/butadiene polymer Poly (styrene-co-divinylbenzene). See Styrene/DVB copolymer Poly (styrene-co-maleic anhydride). See Styrene/MA copolymer Poly (styrene-co-methyl methacrylate). See Styrene/methyl methacrylate copolymer Poly (styrene-co-a-methylstyrene). See Styrene/a-methyl styrene resin Poly (styrene-divinylbenzene). See Styrene/DVB copolymer Polystyrene, expandable Synonyms EPS Expandable polystyrene Expanded polystyrene XPS Definition Amorphous PS beads contg. pentane as a blowing agent and coated with a lubricant the polymer is converted to foamed articles with a closed cell structure by applic. of steam Properties Beads (0.4-1.5 mm diam.)... 

B. N. Kolarz, Interpenetrating Polymer Networks Part II. Poly(methacrylic acid co-divinyl benzene)-Poly(styrene-co-divinylbenzene), Report No. 8, Instytut Technologii Organicznej I Tworzyw Sztucznych (1979). IPNs of Polystyrene/Poly(methacrylic acid). Electron microscopy showing inhomogeneities within each network and between networks. Theory of interpenetration vs. void filling. Ion exchange properties. 

Polymer latex nanoparticles can be prepared in many materials such as polystyrene and acrylate with controllable size, through radical-initiated polymerization in heterogeneous media (Figure 14.2). The sizes of latex nanoparticles are very dependent on the polymerization conditions. To yield nanosized particles, the polymerization is usually carried out in miaoemulsions [34], For some applications, two or more monomers are used. For example, for polystyrene nanoparticles, divinylbenzene (DVB) is used as a cross-linker to improve the structural performance [35] and methacrylic acid (MAA) or methacrylate (MMA) is used as a co-monomer to provide the nanoparticles with desirable surface chemistry [36,37], Furthermore, some fluorochromes or magnetic materials are incorporated into polymer nanoparticles, to render the particles multifunctional [38,39],... 

The most frequently used organic supports are polystyrene and styrene-divinylbenzene copolymer beads with functional groups such as diphenylpho.sphine covalently bonded. The polymer-anchored catalyst complex can then be obtained, for example, by displacement of a ligand already co-ordinated to a soluble metal complex (Cornils and Herrmann, 1996) ... 

The polyamines putrescine, cadaverine, spermidine, and spermine, which are seen at elevated levels in some victims of cancer, were separated on a Technicon (The Technicon Company Chauncey, NY) TSM Amino Acid Analyzer packed with an 8% divinylbenzene-co-polystyrene sulfonated resin with post-column ninhydrin detection.111 Amines such as ethanolamine, noradrenaline, hexamethylene diamine, methoxytryptamine, spermine, and spermidine were separated from amino acids on a DC-4A cation exchange resin.112 A similar approach, using a Beckman Model 121M amino acid analyzer equipped with an AA-20 column, was also successful.113 A Polyamin-pak strong cation exchange column (JASCO) was eluted with a citrate buffer for the detection of putrescene, spermine, cadaverine, and 1,5-diaminohex-ane from rat thymus.114 A post-column o-phthaldehyde detection system was used. 

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