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  • 1
    Electronic Resource
    Electronic Resource
    Pulsed NMR measurements on polyethylene melts (1985)
    Springer
    Polymer bulletin 14 (1985), S. 469-475 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary NMR measurements were carried out for studies on polyethylene fractions in the melt using Hahn's spin echo technique and the MW4 pulse sequence. The decays of transverse magnetization M(t) and the line shape function S(f) are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263464
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  • 2
    Electronic Resource
    Electronic Resource
    NMR studies on the structure of linear polyurethanes and their interactions with chromium (III) chloride. A 1H, 13C, 17O and two-dimensional investigation (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1335-1345 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1H, 13C, 17O and two-dimensional NMR measurements were carried out to characterize the interactions of polyurethanes with chromium (III) chloride. It was found that CrCl3 forms complexes with polyurethanes via the NH groups of urethane groups as well as via the carbonyl groups of urethane groups and polyester. The interactions of CrCl3 with carbonyl groups can be confirmed by 17O measurements in model compounds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910613
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the microstructure of poly(chlorophenyl methacrylates) by 13C NMR spectroscopy (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1431-1437 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(chlorophenyl methacrylate)s with varying number and positions of the chloro substituent were prepared and investigated using 13C NMR spectroscopy. The tactic sequence distribution was determined from the signals of the carbonyl carbon (pentads) and the α-methyl carbon atoms (triads). It was found that the polymers are predominantly syndiotactic with an average sequence length of between 3 and 4. The isotactic sequences accounted for a very small fraction of the polymer chain with an average sequence length of between 1,3 and 1,5. As for the signals of the aromatic carbon atoms it could be demonstrated that, depending on the substitution pattern of the aromatic ring, the sensitivity on sequence distribution was more or less pronounced.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920619
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  • 4
    Electronic Resource
    Electronic Resource
    Sequence analysis and comonomer interactions in poly[(4-chlorophenyl methacrylate)-co-(methyl methacrylate)]s (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 2487-2495 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers of 4-chlorophenyl methacrylate and methyl methacrylate were prepared and investigated by 1H and 13C NMR spectroscopy. The copolymer composition, determined by chlorine analysis, 1H and 13C NMR, was found to be close to the initial composition of the monomer mixture. The sequence analysis was carried out by analyzing the methoxy signals of the 1H NMR spectra. Six out of ten tactic and compositional triads could be resolved. It was found that the copolymers are predominantly syndiotactic and the compositional and tactic triad populations are given. The aromatic carbon atoms are sensitive towards compositional and tactic sequence effects, which results in a switch of the order of the tactic signals at different aromatic carbon atoms.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021921025
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of Gasoline Octane Numbers by 1H- and 13C-NMR spectroscopy (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 691-695 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An equation describing the relationship between the research octane number (RON) and the 1H-and 13C-NMR is proposed. This equation relates the RON to the aliphatic, olefinic and aromatic hydrogen and carbon, respectively. To check this relationship 60 samples were investigated with RON values between 65 and 96. The fitting procedure yielded good agreement between the RON measured with the ASTM method and the RON calculated from both the 1H-and the 13C-NMR.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340809
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  • 6
    Electronic Resource
    Electronic Resource
    Zur vernetzung dünner polymerschichten durch photolyse aromatischer bisazide (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 149-157 
    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: In 1 μm layers of different polymers containing 10 wt.-% 4,4′-diazidobiphenyl, the network formation under the influence of UV-irradiation was estimated by solvent treatment. The high activity of poly(glycidyl methacrylate) against the nitrenes formed is caused by its 1,2-epoxypropyl groups. As confirmed by IR-spectroscopy, the oxirane ring itself is not affected; NMR spectroscopic results indicate reactions between nitrenes and exocyclic CH2-groups.
    Notes: Die UV-Vernetzung in 1 μm-Schichten aus Polymeren verschiedener Konstitution, die 10 Gew.-% 4,4′-Diazidobiphenyl (DABP) enthalten, wird zeitabhängig anhand der reduzierten Schichtdicke nach Lösungsmittelbehandlung verglichen. Für die hohe Vernetzungsgeschwindigkeit von Polyglycidylmethacrylat mit den photolytisch gebildeten Bisnitrenen sind die 1,2-Epoxypropylgruppen verantwortlich. Der Oxiranring bleibt erhalten (IR-Spektroskopie). Wahrscheinlicher Reaktionsort ist die exocyclische CH2-Gruppe (13C-Festkörper-NMR-Spektroskopie).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970113
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  • 7
    Electronic Resource
    Electronic Resource
    Polyurethane ureas with various urea structures. Solution behaviour and morphology (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 208 (1993), S. 107-116 
    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: Sowohl die Wirkung von kettenverlängernden Diaminen auf die Lösungseigenschaften von Polyurethan-Harnstoffen (PUU) als auch der Effekt von zugesetztem LiCl, das die Wasserstoffbrückenbindungen zwischen den Harnstoffeinheiten der in DMF gelösten PUU's zerstört, wurde untersucht. Es wurde beobachtet, daß PUU-Lösungen mit gerader Anzahl an Methylengruppen höhere Viskositäten besitzen als entsprechende Lösungen mit ungerader Anzahl an Methylengruppen. Die Lösungen von PUU's mit gerader Methylengruppenzahl zeigen einen deutlichen Anstieg ihrer Viskositäten in Abhängikeit von der Zeit  -  sogar Gelierung wurde beobachtet  - , während sich die Viskositäten der Lösungen mit ungerader Methylengruppenzahl nicht mit der Zeit verändern. Durch Zugabe geringer Mengen LiCl zu PUU-Lösungen mit gerader Anzahl an Methylengrupppen konnten wegen des dadurch bewirkten Assoziatabbaus ebenfalls Lösungen mit zeitlich unveränderlichen, niedrigen Viskositäten erhalten werden. Dieser Effekt des LiCl wurde im festen Zustand anhand von Filmen, die aus den Lösungen hergestellt wurden, bestätigt.
    Notes: Both the effect of the diamine chain extender on solution properties and the effect of added LiCl destroying the urea hydrogen bonds of the PUU's (polyurethane ureas) in DMF have been investigated. PUU solutions with an even number of CH2 units in the chain extender have higher viscosities than the corresponding solutions with an odd number of CH2 units. While the viscosity of solutions with odd-numbered methylene groups is independent of time, the even-numbered ones show a drastic increase in dependence on time and gelation may even occur. Due to diminished associates, time-independent solution systems of low viscosity have also been obtained by adding a small amount of LiCl to solutions with even-numbered methylene groups.In films cast from the solutions the effect of LiCl has been proved in the solid state.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052080110
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  • 8
    Electronic Resource
    Electronic Resource
    Prenylated Flavanones from Monotes engleri: On-line Structure Elucidation by LC/UV/NMR (1998)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 81 (1998), S. 754-763 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The CH2Cl2 extract of Monotes engleri Gilg. (Dipterocarpaceae) showed antifungal activity against the yeast Candida albicans in our bioautographic TLC assays. After a first fractionation of the crude extract, the bioactivity was located in one of the fractions. To perform an efficient targeted isolation of the active compounds, LC/UV/MS and LC/UV/NMR analyses of the crude extract and the active fraction were performed. LC/UV/, LC/MS, and LC/NMR data (1D and 2D) allowed the identification of 1 as (2S)-2,3-dihydro-5,7-dihydroxy-{3-hydroxy-4-[(3-methylbut-2-enyl) oxy]phenyl}-4H-1-benzopyran-4-one, a new prenylated flavanone, named monoteson A. Subsequent isolation of 1 has permitted the determination of its absolute configuration on the basis of CD measurements. Theree other prenylated flavanoes 2-4 were isolated from the same extract. Compound 3 was identified as 2- (3, 5-dihydroxyphenyl) -2,3-dihydro-5, 7-dihydroxy-6, 8-bis (3-methylbut-2-enyl)-4 H-1-benzopyran-4-one, another new natural product, named monotesone B. The structures of 2 and 4 were established as selinone and lonchocarpol A, respectively. The antifungal activity against Candida albicans was determined for all compounds.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19980810325
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  • 9
    Electronic Resource
    Electronic Resource
    Formation of quinolines from 2-phenylbenzopyrylium chloride (1991)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 581-584 
    Details
    ISSN: 0170-2041
    Keywords: Benzopyrylium cation ; Quinoline ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The quinolines 5a-e are prepared by thermal treatment of 2-phenylbenzopyrylium chloride (4) with aromatic amines. The substitution pattern of the products shows that an unusual Skraup synthesis has taken place.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1991199101105
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  • 10
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    Analysis of a Technical Poly(ethylene oxide) by On-Line HPLC/1H-NMR (1996)
    American Chemical Society
    Details
    Publication Date: 1996-01-01
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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