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  • Polymer and Materials Science  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Determination of copolymerization parameters of methyl methacrylate with dodecyl methacrylate by means of FTIR spectroscopy (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 2289-2296 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The bulk copolymerization of methyl methacrylate (MMA) with dodecyl methacrylate (DMA) initiated by 2,2′-azoisobutyronitrile (AIBN) at 60°C was used to prepare samples with different MMA/DMA ratios. The composition of the copolymers was determined by means of FTIR spectroscopy, using the absorption intensity ratio of CH2/C=O for copolymers in CDCl3 solution and as KBr tablets. Reactivity ratios, determined by the Kelen-Tüdős method, were found to be: rMMA = 1.58 and rDMA = 1.88 for copolymers analyzed in solution, and rMMA = 1.67 and rDMA = 1.95 for samples prepared as KBr tablets. Comparison of copolymer composition of some samples was made with elemental analysis data. It was found that the shift in the C=O maximum observed for the copolymer in CDCI3 solution, compared to the corresponding homopolymer solutions, could also be used for determining copolymer composition.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970719
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions for selective elimination of TEMPO end groups in polystyrene (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 583-588 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The “living” free radical polymerization of styrene in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) affords low polydispersity polystyrene (PS). The thermal instability of the linkage of the TEMPO group of the PS, however, restricts the processing possibilities of the resin. Therefore, different methods were tried to remove the TEMPO end groups from the polystyrene. It was found that oxidation with m-chloroperbenzoic acid (MCPA) and heating in the presence of 2,6-di-tert-butyl-4-methylphenol give the best results while other reagents such as cumene hydroperoxide or lithium aluminium hydride only reduce the concentration of the TEMPO end groups in the final polymer. The product of the oxidation with MCPA was investigated with MALDI-TOF MS and with 1H NMR spectroscopy. It was found that a signal at 4 ppm commonly referred to the polystyrene end connected to the TEMPO group overlaps with an absorption caused by the Diels-Alder adduct of the thermally self-initiated polystyrene. Hence, the facile removal of the TEMPO group gives the opportunity to determine the degree of autopolymerization in a TEMPO based polystyrene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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