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  • 1
    Electronic Resource
    Electronic Resource
    Zur Charakterisierung von Si-Polymeren durch flüssigchromatographische Verfahren in Kopplung mit MALDI-TOF-MS (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 163-174 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Si polymer characterization; LC/MALDI-TOF-MS.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Kopplung der drei flüssigchromatographischen Modi mit MALDI-TOF-Massenspektrometrie ist zur Bestimmung der molekularen, funktionalen und chemischen Verteilungen von Si-Polymeren geeignet. Silsesquioxane und Siloxane dienen als Beispiele für diese Art der Strukturerkennung. Die substanzspezifische Konstruktion einer SEC-Eichkurve mit Hilfe der MALDI-MS wird gezeigt.
    Notes: Summary.  The coupling of the three liquid chromatographic modes with MALDI-TOF mass spectrometry is suitable for the determination of the molecular, functional, and chemical heterogeneities of Si polymers. Silsesquioxanes and siloxanes serve as examples for this method of structure identification. The substance specific construction of the SEC calibration curve by means of MALDI-MS is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010162
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of anionic polymerization of (meth)acrylates in the presence of aluminium alkyls (1995)
    Springer
    Polymer bulletin 35 (1995), S. 169-176 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Methyl methacrylate was polymerized with tert-butyl lithium in the presence of triethylaluminium or triisobutylaluminium at 78°C in toluene. As indicated by GPC and MALDI-TOF mass spectrometry, the polymerization is accompanied by side reactions. The lower oligomers were fractionated by distillation and characterised by NMR, FT-IR, UV and electron impact (EI) mass spectrometry. All these data show that part of the polymer chains are carrying exactly one tert-butyl isoprenyl ketone unit. In order to avoid the formation of tert-butyl isoprenyl ketone a molar ratio of Al/Li〉2 is necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312910
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of the anionic copolymerization of anhydride-cured epoxies - analyzed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 359-366 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The mechanism of the strictly alternating anionic copolymerization of phenyl glycidyl ether (PGE) and phthalic anhydride (PA) was initiated by various imidazoles. Because of the strictly alternating copolymerization polyesters with a repeating unit of PGE-PA were obtained. The mechanism of the reaction was analyzed by means of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). With this technique the molar masses of the oligomers, the molar mass of the repeating unit, the weight-average molar mass M̄w and the number-average molar mass M̄n, their ratio M̄w/M̄n and the residual molar mass could be calculated. The strictly alternating copolymerization was easy to prove because the molar masses of PGE and PA are slightly different. The question whether the initiator remains chemically bound during the whole reaction could be solved. To this end polyesters obtained by initiation with various imidazoles with different molar masses were synthesized. The calculated residual molar masses correspond exactly to the molar masses of the imidazoles.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170512
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetische Untersuchungen der Alkoholyse von Säurephosphiden (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 369-376 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die sauer katalysierte Alkoholyse von Aroyldiphenylphosphinen in wasserfreiem Äthanol wurde an einer Reihe im Aroylrest substituierter Verbindungen durch elektronenspektroskopische Bestimmung des Verbrauchs an Aroylphosphin kinetisch untersucht. Die Reaktion verläuft in bezug auf die Aroyphosphine nach pseudo-erster Ordnung. Anhand der Reaktionskonstanten und des inversen Isotopieeffektes konnte ein A2-Mechanismus nachgewiesen werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160304
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