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  • 1
    Electronic Resource
    Electronic Resource
    Free radical copolymerization of 1-vinyl naphthalene with styrene, methyl methacrylate, and acrylonitrile (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 1096-1100 
    Details
    ISSN: 1435-1536
    Keywords: Freeradicalcopolymerization ; 1-vinyl-naphtalene ; styrene ; methylmetha-crylate ; acrylonitril ; relativereactivity ratios ; Q- ande-values
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Investigations on free radical copolymerization of 1-vinyl naphthalene (1-VNph, monomerM 2) with styrene (St), methyl methacrylate (MMA) and acrylonitrile (AN) (monomersm 1) in bulk at 60°C with AIBN as initiator are presented. Relative reactivity ratios were calculated by the Kelen-Tüdös method yielding:r st=0.70 ±0.23 andr 1−VNph=2.02 ±0.40 for system St/1-VNph;r MMA=0.32 ±0.10 andr 1−VNph=0.57 ±0.07 for system MMA/1-VNph andr AN=0.11 ±0.03 andr 1−VNph=0.45 ±0.09 for system AN/1-VNph.Q, e values for 1-VNph according to Alfrey, Price scheme were calculated toQ 1−VNph=1.02,e 1−VNph=−0.62.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01496929
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  • 2
    Electronic Resource
    Electronic Resource
    Analyse der Methylolmelamine durch Dünnschicht- und Gel-Chromatographie (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 294 (1979), S. 375-378 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von Methylolmelaminen ; Chromatographie, Dünnschicht/Chromatographie, Gel ; Melamin-Formaldehyd-Harze
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die dünnschicht-chromatographische Trennung der verschiedenen Methylolmelamine kann man durch Verwendung von DMF/H2O/ CHCl3/Isopropanol (im Volumenverhältnis 1∶1∶1∶3) als Fließmittel und Cellulose als Sorptionsmittel verbessern. Gel-chromatographisch lassen sich mit Sephadex LH 20 als stationärer Phase und DMF als Elutionsmittel die meisten Methylolmelamine als gut erkennbare Peaks trennen, so daß man anhand der Gel-Chromatogramme die Verteilung der Methylolierungsprodukte und den Verlauf der Methylolierung von Melamin verfolgen kann.
    Notes: Summary Thin-layer Chromatographic separation of the different methylolmelamines can be improved by applying DMF/H2O/CHCl3/isopropanol (1∶1∶1∶3 by volume) as eluting solvent and cellulose as layer material. Using Sephadex LH 20 as stationary phase and DMF as eluent the gel-permeation chromatographic separation of different methylolmelamines can be achieved. The distribution of the initial reaction products of melamine and formaldehyde and the course of the methylolization reaction can be observed by gelpermeation chromatograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468526
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    Paper (German National Licenses)
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