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  • 1
    Digitale Medien
    Digitale Medien
    Uniform polymer particles by dispersion polymerization in alcohol (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 2995-3007 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Uniform polystyrene particles in 1-10 μm size range and up to 40% solid contents have been prepared by polymerizing styrene in ethyl alcohol with azo-type initiators and a polymeric stabilizer polyvinylpyrrolidone along with an anionic, nonionic, or comonomeric co-stabilizer. Effects of polymerization parameters, such as monomer concentration, type of co-stabilizer, initiator type and concentration, crosslinking monomer, and diluent on average particle size and size distribution have been studied. Functional groups such as hydroxyl, carboxyl, amine, amide, silane, polydimethylsiloxane, and silacrown have been successfully incorporated onto the particles by copolymerization. A mechanism for particle formation and growth in dispersion polymerization is presented.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1986.080241126
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  • 2
    Digitale Medien
    Digitale Medien
    Mass spectrometric differentiation of huperzinine, N,N-dimethylhuperzine A and N-methylhuperzine B (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 99-104 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The newly isolated Lycopodium alkaloids huperzinine, N,N-dimethylhuperzine A and N-methylhuperzine B were studied by high-resolution and tandem mass Spectrometry. Differentiation of these subtly different isomers from each other and from the general class of Lycopodium alkaloids can be achieved by taking advantage of the structure-specific fragment ions formed upon electron ionization (El) or collisional activation of these alkaloids. β-Obscurine was identified as an impurity component in the N-methylhuperzine B sample and contributed to the El mass spectrum. The previously published El mass spectrum of N-methylhuperzine B is likely to be that of a mixture of N-methylhuperzine B and β-obscurine. The presence of the impurity can now be readily recognized on the basis of two characteristic fragment ions of m/z 215 and 187.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210270206
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  • 3
    Digitale Medien
    Digitale Medien
    Adhesion promotion for epoxy resin/copper and polyimide/copper joints by a two-component coupling system of poly(4-vinylimidazole) and cystamine (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 227 (1995), S. 121-129 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Ein zweikomponentiger Haftvermittler für Kupfer wurde durch aufeinander folgendes Eintauchen des Kupfers in Poly(4-vinylimidazol)- and Cystamin-Lösung hergestellt. Er verbessert das Korrosionsverhalten von Kupfer, und die Haftung von Epoxidharz oder Polyimid auf Kupfer, auch bei höheren Temperaturen, ist besser als bei Verwendung der einzelnen Komponenten.
    Notizen: A two-component coupling agent layer on copper, produced by immersion of copper in poly(4-vinylimidazole) solution and then in cystamine solution, showed better anticorrosive performance and higher adhesive strength for epoxy resin and polyimide than each single component even at high temperature.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1995.052270112
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  • 4
    Digitale Medien
    Digitale Medien
    Dispersion polymerization of styrene in ethanol: Monomer partitioning behavior and locus of polymerization (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1187-1203 
    Details
    ISSN: 0887-6266
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A thermodynamic model has been proposed for the simulation of monomer partitioning behavior in the dispersion polymerization of styrene in ethanol. The monomer concentration in the polymer particles is very low (20 vol% at 5% conversion) and decreases further as the polymerization proceeds. It is independent of stabilizer concentration but is strongly dependent on initial monomer concentration. The partitio n coefficient ([Mp]/[Mc]) of styrene increases from 0.8 to 1.1 with incresing conversion. There are two polymerization loci in dispersion polymerization, namely the continuous and polymer phases. Competition between solution and heterogeneous polymerization has been observed in this system. The rate of dispersion polymerization is dependent on initial monomer concentration but is independent of initiator concentration at higher conversions. The molecular weight of the polymers produced by this process increases with increasing conversion and decreases with increasing initiator concentration.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1988.090260604
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  • 5
    Digitale Medien
    Digitale Medien
    Electrochemical and XPS evidence of the aqueous formation of Mo2O5 (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 66-70 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: XPS was employed to detect the surface species deposited on an activated platinum electrode following cathodic polarization in deaerated 0.1 M (NH4)6Mo7O24 · 4H2O solution. At - 160 mV (saturated calomel electrode, SCE), evidence was found of the possible dissociation of polymolybdate to molybdate with subsequent surface adsorption. At -340 mV (SCE) molybdate was observed to reduce to Mo5+ in the form of Mo2O5. At - 540 mV (SCE), Mo4+ was the stable species, existing in the form of tetravalent oxyhydroxide MoO(OH)2 according to XPS analysis. No further reduction from Mo4+ to lower-valent states was observed when cathodically polarized to - 900 mV (SCE). Mo2O5 was found to be unstable in air, oxidizing readily to MoO3.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740140114
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