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  • 1
    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: The homopolymerisation of N-(5-methyl-3-oxo-4-oxo-hexen-5-yl)-dimethylmaleimide (DMI-MA) leads to linear poly(methylmethyacrylates) with pendant lightsensitive dimethylmaleimide groups. Due to steric hindrance of the methyl substitutents, the carbon-double bond is not involved in the reaction, even at conversions of over 90%. The reaction velocity constant for the homopolymerisation is kp/kt0,5 = 2,0 - 2,2.10-2 (65°C, toluene, AIBN) and the activation energy Ea = 62,36 ± 2 KJ/mol-1.Measurement of the copolymerisation reactivity ratios for the monomer pairs DMI-MA/methacrylic acid (MAS), DMI-MA/methylmethacrylate (MMA) and DMI-MA/ethylacrylate (EA) gave the following values: DMI-MA (r1): MAS (r2) = 1,36 ±0,06 : 0,77: ± 0,06; DMI-MA (r1) : MMA (r2) = 1,16 ± 0,17:0,475 ± 0,17 and DMI-MA (r1): EA(r2) = 1,60 ± 0,15: 0,44 ± 0,15.
    Notes: Die Homopolymerisation von N-(5-Methyl-3-oxa-4-hexen-5-yl)-dimethylmaleinimid (DMI-MA) führt zu linearen Polymethylmethacrylaten mit seitenständigen lichtvernetzbaren Dimethylmaleinimid-Gruppen. Dabei nimmt die —C=C— Doppelbindung des Imidylrestes infolge sterischer Hinderung durch die beiden Methylsubstituenten, selbst bei Umsätzen von über 90%, nicht an der Reaktion teil. Für die Homopolymerisation wurde die Polymerisationsgeschwindigkeitskonstante bestimmt zu kp/kt0,5 = 2,0 - 2,2·10-2(65°C, Toluol, AIBN); die Aktivierungsenergie beträgt Ea = 62,36 ± 2 kJ/mol-1.Aus den Copolymerisationen der Monomerpaare DMI-MA/Methacrylsäure (MAS), DMI-MA/Methylmethacrylat (MMA) und DMI-MA/Ethylacrylat (EA) ergaben sich folgende Copolymerisationsparameter: DMI-MA (r1) : MAS (r2) = 1,36 ± 0,06 : 0,77 ± 0,06; DMI-MA (r1) : MMA (r2) = 1,16 ± 0,17 : 0,475 ± 0,17 und DMI-MA (r1) : EA (r2) = 1,60 ± 0,15 : 0,44 ± 0,15.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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