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  • 1985-1989  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and properties of polymers with unusual structure (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 12 (1985), S. 1-9 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This lecture summarize some recent results of our current research. The first part describes the homopolymerization and copolymerization of a monocyclic and two bicyclic unsaturated acetals. In this way polyacetals with 1,4-cis-butadiene units and cyclohexene units respectively are obtained. Secondly, the N-substitution of polyamides is described. By N-metalation and subsequent alkylation comb-like polyamides are available. Longer branches cause a side-chain crystallinity. The anionic “grafting-from” technique forms irregular branched polyamides. By termination reaction between living ends of poly(2-isopropenylnaphthalene) and suitable electrophiles new macromonomers are available. The last part describes their copolymerization with butyl methacrylate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.020121985102
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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
    Blockcopolymere aus 2-Isopropenylnaphthalin und Hexamethylcyclotrisiloxan, 76.Mitt.: siehe2.Herrn Prof. Dr. Josef Schurz anläßlich seines 60. Geburtstags mit freundlichsten Grüßen und besten Wünschen gewidmet (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 2301-2309 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Anionic polymerization of 2-isopropenylnaphthalene (2-IPN), with butyllithium in THF at -78°C was terminated with ethylene oxide and the resulting terminal alkoxide was used to initiate the polymerization of hexamethylcyclotrisiloxane (D3) at +40°C. This led to the formation of AB-block copolymers which were coupled to ABBA-block copolymers by addition of dichlorodimethylsilane. ABBA-blockcopolymers were obtained with contents of polymethylsiloxane (poly(DMS)) between 77 and 84% of weight and block molecular weights between 1 700 and 27 000 (poly(2-IPN)) and 13 000 and 240 000 (poly(DMS)). Phase separation in polymer films casted from different solvents was studied by electron microscopy and by DSC measurements. The block copolymers behave as elastomers in the temperature range from -40 to +190°C. Above 290°C depolymerization of poly(2-IPN) starts.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021861111
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Some new examples of polymer modification (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 13 (1985), S. 123-136 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This lecture summarizes some of our recent results about reactions with synthetic polymers. By cationic ring-opening polymerization of 4H, 7H-1,3-dioxepin a linear polyacetal containing one C-C-double bond per repeating unit is obtained. Copolymerization of this monomer with trioxane or dioxolane is possible. Various addition reactions can be carried out with these unsaturated polyacetals, polymeric epoxides being of special interest. Some other unsaturated cycloacetals are briefly mentioned. Amide moieties in linear polyamides can be modified by different reactions. Preparation and properties of poly-N-chloroamides and poly-N-trifluoroacetyl-amides are described. By reaction of metalated polyamides with alkyl halides poly-N-alkylamides are available. Anionic grafting reactions can also be carried out. Reduction of the amide groups leads to the formation of polyminoalkylenes. By topochemical polymerization of esters of 10,12-docosadiyne-1, 22-diol soluble polydiacetylenes are obtained. These polymers react in homogeneous solution with SbCl5 or FeCl3. Furthermore the hydrolysis of the ester groups and the reacylation is described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.020131985110
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  • 6
    Electronic Resource
    Electronic Resource
    On the polymerization of 2-isopropenylnaphthalene, 8Part 7: cf.2.. Reactivity and structure of the living species at different temperatures (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 2151-2161 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: ESR spectroscopic analyses of the deep-green solutions of living poly(2-isopropenylnaphthalene) [poly(2-IPN)] in THF at -80°C provided no evidence of the presence of radical anions as long as butyllithium (BuLi) was used as initiator. In contrast to this finding, radicals could indeed be detected if the polymerization was performed with metallic potassium in THF. These radicals were found to be only stable at low temperatures. UV/VIS spectra of solutions of 2-IPN in THF or toluene and of catalytic quantities of BuLi were recorded at temperatures between -45 and +20°C. On heating to 〉0°C, the colour of the deep-green solution changes irreversibly to reddish-brown, and this colour change is associated with a spontaneous deactivation of the living poly(2-IPN). End-capping reactions with anthracene derivatives and the block copolymerization with hexamethylcyclotrisiloxane gave a first idea of the reactivity and structure of the species present in the reddish-brown solution. A suggestion is made for the deactivation mechanism.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880912
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