ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 188 (1991), S. 97-103 
    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: Copolymere aus 2-Vinylpyridin (2-VP) und Methylmethacrylat (MMA) bzw. Ethylmethacrylat (EMA) wurden über einen Charge-transfer-Mechanismus unter Verwendung von n-Butylamin (n-BA) und Tetrachlormethan (CCl4) als Initiator in Dimethylsulfoxid (DMSO) bei 60°C hergestellt. Die Copolymeren wurden IR- und 13C-NMR-spektroskopisch charakterisirt und ihre Zusammensetzung elementaranalytisch bestimmt. Die Copolymerisationsparameter (r1, r2) für beide System 2-VP/MMA und 2-VP/EMA wurden sowohl nach Fineman-Ross (F-R) als auch nach Kelen-Tüdós (K-T) bestimmt: r1(2-VP) = 0,30 ± 0.02, r2(MMA) = 1,20 ± 0.02 und r1(2-VP) = 0,71 ± 0.02 r2(EMA) = 0,63 ± 0.03 nach der F-R-Methode; r1(2-VP) = 0,30 ± 0.04, r2 (MMA) = 1,21 ± 0.04 und r1 (2-VP) = 0,70 ± 0.03, r2(EMA) = 0,63 ± 0.03 nach der K-T-Methode. Die Ergebnisse deuten auf eine statistische Verteilung der Monomereinheiten in den Copolymeren hin.
    Notes: Copolymers of 2-vinylpyridine (2-VP) with methylmethacrylate (MMA) and ethylmethacrylate (EMA) were synthesized by a charge transfer mechanism using a mixture of n-butylamine (n-BA) and carbon tetrachloride (CCl4) as the initiator in dimethyl sulphoxide (DMSO) at 60°C. The copolymers were characterized by IR and 13C NMR spectroscopy. The percentage composition of the copolymers was established by elemental analysis. The monomer reactivity ratios (r1, r2) of 2-VP-co-MMA and 2-VP-co-EMA copolymers were determined by both Fineman-Ross (F-R) and Kelen-Tüdős (K-T) methods: r1 (2-VP) = 0.30 ± 0.02, r2 (MMA) = 1.20 ± 0.02 and r1 (2-VP) = 0.71 ± 0.02, r2 (EMA) = 0.63 ± 0.03 by F-R method. While r1 (2-VP) = 0.30 ± 0.04, r2 (MMA) = 1.21 ± 0.04, and r1 (2-VP) = 0.70 ± 0.03, r2 (EMA) = 0.63 ± 0.03 by K-T method. These values indicate that the system follows random distribution of the monomeric units.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1415-1421 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Isopropyl methacrylate (IPMA) with Acrylonitrile (AN) and Methacrylonitrile (MAN) copolymers of different copositions were prepared at 60°C and 80°C, respectively, using a mixture of n-Butylamine (nBA) and carbon tetrachloride (CCl4) in dimethyl sulphoxide (DMSO) as a charge transfer (CT) initiator. The percentage composition of the copolymers was established by elemental analysis. The copolymerization reactivity ratios were computed by the Kelen-Tudos method. In both the systems, IPMA was found to be more reactive; the copolymers sequence was random in nature. The copolymers were characterized by IR, 1H-NMR, 13C-NMR spectroscopy and intrinsic viscosity measurements in dimethyl formamide (DMF) at 30±0.1°C. The thermal behavior of the AN-IPMA copolymers was studied by thermogravimetry (TG) in air. The thermal stability increased, with increasing AN content in the copolymer chain. The solubility parameter of AN-IPMA copolymer was evaluated by studying the intrinsic viscosity in different solvents. The solubility parameter of the copolymer was found to be 9.7 (cal/cc)1/2.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...