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  • 1
    Electronic Resource
    Electronic Resource
    Alternating, all-trans polyenynes: Model compounds for poly(diacetylene)s with defined conjugation length (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 43-60 
    Details
    ISSN: 0959-8103
    Keywords: poly(diacetylene)s ; model compounds ; conjugated polyenynes ; infinite chain length ; 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: The syntheses of polyenynes as model compounds for poly(diacetylene)s (PDAs) are described. Variation of properties (UV-VIS, Raman, NMR and bond geometries) as a function of the chain length was investigated. After extrapolation to infinite chain length these data were compared to those for PDAs. From UV-VIS spectra a value of λ = 551 nm (2.25 eV) was calculated corresponding to the electronic transition of a single polyenyne chain. This energy is located at the low energy end of a yellow PDA solution spectrum. From Raman scattering v(C≡C) = 2108-2128 cm-1 and v(C≡C) = 1505-1532 cm-1 were calculated after extrapolation. Similarly sp-C13C NMR data yielded a shift of δ = 100 ppm. These data are almost identical to data known for yellow PDA solutions. Bond geometries are almost identical to those of poly(diacetylene)s and theoretical data.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330106
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of optically active 2,4-disubstituted-2-oxazolines and their polymerization (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 229-233 
    Details
    ISSN: 0959-8103
    Keywords: chiral 2-oxazolines ; cationic polymerization ; ring-opening polymerization ; 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: Four different optically active 2,4-disubstituted-2-oxazolines were synthesized and characterized. Cationic polymerization of these oxazolines were studied. Three of the oxazolines could be polymerized using methyl trifluoromethanesulfonate as initiator. S-(-)-2-Phenyl-4-isopropyl-2-oxazoline could not be polymerized under the conditions used.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210340216
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of polyvinyl acetate-graft-poly-2-oxazolines (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 157-161 
    Details
    ISSN: 0959-8103
    Keywords: poly(vinyl acetate-co-vinyl chloroformate) ; polyvinyl acetate-graft-poly-2-oxazolines ; synthesis ; characterization ; 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: Poly(vinyl acetate-co-vinyl chloroformate) (1) was synthesized via phosgenation of poly(vinyl acetate-co-vinyl alcohol). It was shown that (1) is capable of initiating the polymerization of 2-phenyl-2-oxazoline and 2-methyl-2-oxazoline, when the counter ion is exchanged using potassium iodide. Polyvinyl acetate-graft-poly-2-phenyl-2-oxazoline and polyvinyl acetate-graft-poly-2-methyl-2-oxazoline are obtained in the grafting reaction.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210340206
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  • 4
    Electronic Resource
    Electronic Resource
    Charge-Transfer-Komplexe mit Polymeren aus substituierten Spirocyclopropan-1.9′-fluoren-Verbindungen. 1. Mitt. Modellverbindungen und Oligomere (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 146 (1971), S. 195-205 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Complex formation, ε-values and stoichiometry of charge-transfer complexes of TCNE and TCNQ respectively with substituted spiro-cyclopropane-1.9′-fluorene derivatives as well as with a dimer and a oligoester of the same type have been determined. In general, TCNQ complexes show CT-bands at longer wavelengths than TCNE complexes. TCNE-complexes of the cis-isomers have been proven to be more stable than those of the trans-isomers.
    Notes: Komplexbildungskonstanten, molare Extinktionskoeffizienten und Stöchiometrie der CT-Komplexe von Tetracyanäthylen (TCNE) und Tetracyanchinodimethan (TCNQ) mit substituierten Spirocyclopropan-1.9′-fluoren-Verbindungen sowie mit einem Dimeren und einem Oligoester wurden mittels spektroskopischer Methoden bestimmt. Die TCNQ-Komplexe haben längerwellige CT-Banden als die TCNE-Komplexe. Die TCNE-Komplexe der cis-Isomeren sind stabiler als die der trans-Isomeren.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021460120
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  • 5
    Electronic Resource
    Electronic Resource
    Die elektrochemisch initiierte kationische copolymerisation von Trioxan und 1.3-Dioxolan (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 152 (1972), S. 305-309 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021520127
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  • 6
    Electronic Resource
    Electronic Resource
    Sequenzanalyse bei Trioxan/Dioxolan-Copolymeren durch NMR-Spektroskopie unter Zusatz von Lanthaniden-Komplexen (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 152 (1972), S. 311-315 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: NO Abstract.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021520128
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  • 7
    Electronic Resource
    Electronic Resource
    Sequenzanalyse bei trioxocan/dioxolan-copolymeren durch NMR-spektroskopie unter zusatz von lanthaniden-komplexen (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 162 (1972), S. 103-111 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By addition of the paramagnetic lanthanide chelate Eu(DPM)3 to the solution of a trioxocane/dioxolane-copolymer it is possible to determine the composition of the copolymer and various sequences by NMR. At the beginning of the polymerization the more reactive trioxocane (TOC) polymerizes preferentially (rTOC = 78, rDOL = 1,7). During the further course of the reaction dioxolane is incorporated into the polymer, probably through transacetalization-reactions, to a nearly statistical distribution of the monomer units.
    Notes: Zusatz des paramagnetischen Lanthanidenchelats Eu(DPM)3 zur Meßlösung eines Trioxocan/Dioxolan-Copolymeren ermöglicht im kernmagnetischen Resonanzspektrum die Bestimmung der Bruttozusammensetzung und verschiedener Sequenzen. Das sehr reaktionsfähige Trioxocan (TOC) polymerisiert zu Beginn bevorzugt (rTOC = 78, rDOL = 1,7); Dioxolan (DOL) wird im weiteren Verlauf der Reaktion wahrscheinlich durch Transacetalisierungsreaktionen in das Polymere eingebaut bis zu einer nahezu statistischen Verteilung der Grundbausteine.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021620110
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  • 8
    Electronic Resource
    Electronic Resource
    Analytische Untersuchungen an Styrol-Vinylacetat-Copolymeren (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 32 (1973), S. 137-144 
    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: The recently described method for determination of vinyl acetate in ethylene vinyl acetate copolymers has been extended to styrene/vinyl acetate copolymers and the results have been compared with those found by other methods.The described analytical method gives the following reactivity ratios. \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm r}_{{\rm Vinylacetat}} {\rm = 0,056 } \pm {\rm 0,003;} \\ {\rm r}_{{\rm Styrol}} {\rm = 61 } \pm {\rm 1} \\ \end{array} $$\end{document}(initiated by benzoylperoxide at 70 °C, without solvent).
    Notes: Die Kürzlich für die Bestimmung von Vinylacetat in Äthylen-Vinylacetat copolymeren beschriebene Methode wird auf Styrol-Vinylacetat-Copolymere übertragen. Die Ergebnisse werden mit den nach anderen Methoden gefundenen Werten verglichen. Für die mit Benzoylperoxid initiierte Copolymerisation in Substanz ergeben sich unter Verwendung der neuen Analysenmethode folgende Parameter \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm r}_{{\rm Vinylacetat}} {\rm = 0,056 } \pm {\rm 0,003; r}_{{\rm Styrol}} {\rm = 61 } \pm {\rm 1} $$\end{document}
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1973.050320111
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetik und Mechanismus der ringöffnenden Polymerisation von L( - )-LactidHerrn Professor Dr. W. KERN mit herzlichen Grüßen und besten Wünschen zum 65. Geburtstag gewidmet (1971)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 15 (1971), S. 109-126 
    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: Suitable initiators for polymerization of lactide are: diethylzinc, triethlaluminium or tin (IV) chloride; the following compounds have been ineffectual: triethyloxonium tetrafluoroborate, tropylium tetrafluoroborate, tritylium hexachloroantimonate, phenyldiazonium hexafluorophosphate or alumintium chloride. The polymerization was found to be a first order reaction in respect to monomer concentration. Concentration of active centers remains constant over whole the polymerization time. Deu to transesterification reactions there are rather strong deviations from an ideal living polymerization system. A coordinative polymerization mechanism is discussed. The overall activation energy amounts to 18.9 (kcal/Mol).
    Notes: Für die Polymerisation von Lactid geeignete Initiatoren sind: Diäthylzink, Triäthylaluminium oder Zinntetrachlorid; folgende Verbindungen waren unwirksam: Triäthyloxoniumtetrafluobrat, Tropyliumtetrafluoborat, Tritylumhexachloroantimonat. Phenyldiazoniumhexafluophosphat oder Aluminiumtrichlorid. Die Polymerisation besteht in einer Reaktion 1. Ordnung in bezug auf die Monomer-Konzentration; es findet kein Abbruch statt und die Konzentration der aktiven Zentren bleibt konstant. Infolge Umesterungs-Reaktionen ergeben sich jedoch starke Abweichungen von einem idealen lebenden Polymerisations-System. Es wird ein koordinativer Polymerisations-Mechanismus diskutiert. Die Brutto-Aktivierungsenergie beträgt. 18,9 (kcal/Mol).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1971.050150109
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  • 10
    Electronic Resource
    Electronic Resource
    Analyse von vinylacetat-vinylpropionat-copolymeren (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 33 (1973), S. 153-157 
    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: The recently described method for the quantitative determination of vinyl acetate in copolymers has been extended to other vinyl esters. The investigation comprises vinyl acetate/vinyl propionate copolymer dispersions and solid materials with a vinyl acetate content of 0-100%. The aliphatic acids liberated by a ptoluenesulfonic acid melt have been determined potentiometrically. A gaschromatograph has been used for the identification of these acids and the determination of their relative amounts.
    Notes: Die kürzlich für die quantitative Bestimmung von Vinylacetat in Copolymeren beschriebene Methode wird auf andere Vinylester übertragen. Es wurden Vinylacetat-Vinylpropionat-Copolymere in Dispersion und fester Form mit Vinylacetatgehalten zwischen 0 und 100% untersucht. Die Summe der in geschmolzener p-Toluolsulfonsäure abgespaltenen aliphatischen Säuren wird potentiometrisch bestimmt. Die Identifizierung der Säuren und die Bestimmung der Mengenverhältnisse erfolgt durch Gaschromatographie.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1973.050330111
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