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  • 1
    Electronic Resource
    Electronic Resource
    The influence of molecular weight on the reactivity of a vinylbenzyl ether macromonomer of poly(2,6-dimethyl-1,4-phenylene oxide) (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 2605-2627 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a series of vinylbenzyl ether macromonomers of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO-VBE) with number average molecular weights between 1,000 and 27,000 and narrow molecular weight distribution is presented. The reactivity ratio r1 was determined for the comonomer pairs methyl methacrylate (MMA) and butyl methacrylate (BMA), respectively (M1), and PPO-VBE (M2) over the entire range of molecular weights of the macromonomer. r1 was determined by the single experiment intergrated equation. Since both the monomer and macromonomer present an induction period, it has been shown that the determination of r1 from one single point experiment is not correct. Accurate r1 values can be obtained from one single copolymerization experiment only when the comonomer conversions are determined at several different reaction times. The macromonomer reactivity (1/r1) increases with its molecular weight up to about 5,000-7,000. Above these values its reactivity decreases. An attempt to explain this behavior based on the kinetic excluded free volume effect is presented.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250925
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  • 2
    Electronic Resource
    Electronic Resource
    Polymers of 1-azabicyclo[4.2.0]octane, 2.Part 1: cf.8. Polystyrene-block-poly(1-azabicyclo[4.2.0]octane) by mixed-mechanism techniqueDedicated with best regards to Prof. Dr. H. Sinn on the occasion of his 60th birthday (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2551-2562 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By endcapping of living polystyrene with ethylene oxide and subsequent reaction with bromoacetyl bromide a polymer with a bromoacetoxy endgroup was obtained. This was used as a macroinitiator for the living cationic polymerization of 1-azabicyclo[4.2.0]octane. The structure and composition of the so formed two-block copolymer was elucidated by different methods. The ratio of the two block and their lengths were varied within broad limits.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901020
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  • 3
    Electronic Resource
    Electronic Resource
    Polymers of 1-azabicyclo[4.2.0]octane, 1. Structure of monomer and homopolymerDedicated with best regards to Prof. Dr. H. Dörfel on the occasion of his 60th birthday (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 1267-1277 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structure of 1-azabicyclo[4.2.0]octane (1) was evaluated by NMR spectroscopy. It was found that the six-membered ring has a chair conformation with the four membered ring in the N-axial and C-6-equatorial position, and as a consequence, the monomer allows neither a ring inversion nor a nitrogen inversion. It possesses two centers of chirality, one at the nitrogen atom and one at C-6. Homopolymerization was carried out in methanol at 60°C with N-alkyl ammonium salts of 1 affording the polymer in high yield within a few hours. Its NMR spectra reveal that the polymer chain is preferably arranged in the biequatorial position of the six-membered ring. As a polybase the polymer can be titrated quantitatively with acids. Its glass transition temperature is 8°C, the decomposition starts at 320°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890604
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  • 4
    Electronic Resource
    Electronic Resource
    Block- und Propfcopolymere als Verträglichkeitsvermittler in PolymermischungenHerrn Prof. Dr. H.-J. Cantow zum 65. Geburtstag gewidmet (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 162 (1988), S. 53-68 
    Details
    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: Two chemically different polymers are generally incompatible, i.e. they possess a high surface tension and low surface adhesion.Block and graft copolymers can strongly reduce this undesirable effect. A concept for compatibilisers with chemically identical and chemically different, but thermodynamically miscible blocks is presented. Using the system poly[oxy(1,4-phenylene)]/poly(styrene-co-acrylonitrile) (PPE/PSAN) all the possible variations  -  identical-identical, identical - miscible, and miscible - miscible  -  were tested. The results are discussed.
    Notes: Zwei chemisch verschiedene Polymere sind im allgemeinen unverträglich, d. h. sie weisen eine hohe Oberflächenspannung und geringe Grenzflächenhaftung auf. Block-und Pfropfcopolymere können diese unerwünschten Effekte stark verringern. Ein Konzept für Verträglichkeitsvermittler mit chemisch identischen und chemisch unterschiedlichen, aber thermodynamisch mischbaren Blöcken wird vorgestellt. Am System Poly[oxy(1,4-phenylen)]/Poly(styrol-co-acrylnitril) (PPE/PSAN) werden alle möglichen Varianten  -  identisch-identisch, identisch-mischbar und mischbar-mischbar  -  getestet. Die Ergebnisse werden diskutiert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051620104
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