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  • Chemistry  (3)
  • template polymerization  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 787-796 
    ISSN: 0887-624X
    Keywords: template polymerization ; crosslinked PMAA ; calorimetry ; morphology ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of crosslinked poly(methacrylic acid) (c-PMAA) on the polymerization of N-vinylimidazole in aqueous solution was studied using UV, calorimetry, SEM, and TEM. It was established that synthetic lightly crosslinked PMAA samples behaved intermediate between rigid crosslinked PMAA particles functioning as microreactors, and linear conventional PMAA, where template and conventional polymerization in the surrounding solution are integrated. A modified calorimetric technique was used to measure monomer conversion, and to correct for the rapid adsorption process. Rate enhancements up to a factor of 4 were obtained for the c-PMAA's, which were lower than those obtained for linear conventional PMAA, and which slightly decreased with increasing crosslink density of the samples. Template complexes possessed a platelet-like morphology similar to template complexes obtained for linear PMAA.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 147 (1987), S. 83-97 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Membranen aus Komplexen von Poly(vinylpyrrolidon) und Poly(methacrylsäure) (PVP und PMAA) zeigen sich geeignet für die Pervaporation von Wasser-n-Propanol-Mischungen durch diese Membranen. Die Membranen sind selektiv bezüglich der Permeation von Wasser. Der Trennfaktor α steigt mit zunehmendem Gehalt an Propanol, wPrOH, und erreicht einen maximalen Wert für wPrOH ∽ 0,8 für PVP-reiche und nahe wPrOH = 1 für PMAA-reiche Membranen. Alle Membranen zeigen eine maximale Quellung bei Werten für wPrOH von ca. 0,4.Bei einem konstanten wPrOH von 0,8 ändert sich der Wert für α in einer komplizierten Weise mit der Zusammensetzung der Membran. Bei diesen Bedingungen ändert sich α proportional zum Quellungsgrad. Für die Ergebnisse bei Membranen mit nicht zu hohen Überschüssen an PVP oder PMAA wird eine vorläufige Erklärung vorgeschlagen.
    Notes: Membranes composed of poly(vinylpyrrolidone)-poly(methacrylic acid) (PVP-PMAA) complexes appear to be suitable for pervaporation of water-n-propanol mixtures. The membranes are selective to water. The separation factor α increases with increasing content of propanol, wPrOH, and reaches a maximum value for wPrOH at about 0.8 in the case of PVP-rich membranes, and close to wPrOH = 1 for PMAA-rich membranes. All membranes exhibited maximum swelling at wPrOH of ca. 0.4.At constant wPrOH of 0.8 the value of α changes in a complicated manner with the composition of the membrane. Under this condition of constant wPrOH, α runs parallel with the swelling degree. A tentative explanation is proposed for results pertaining to membranes containing not too high excesses of PVP or PMAA.
    Additional Material: 11 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 13 (1975), S. 725-729 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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