ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
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
  • 1975-1979  (9)
Collection
Keywords
Publisher
Years
Year
  • 1
    facet.materialart.
    Unknown
    C-13 NMR study on configurations of disubstituted cyclohexanone and cyclohexane derived therefrom by the Huang-Minlon process (1975)
    Elsevier
    Details
    Publication Date: 1975-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Preparative high-performance gel chromatography for acidic and neutral saccharides (1979)
    Elsevier
    Details
    Publication Date: 1979-09-01
    Print ISSN: 0021-9673
    Electronic ISSN: 1873-3778
    Topics: Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Separation of acidic and neutral saccharides by high-performance gel chromatography on cation-exchange resins in the H+form with acidic eluents (1979)
    Elsevier
    Details
    Publication Date: 1979-11-01
    Print ISSN: 0021-9673
    Electronic ISSN: 1873-3778
    Topics: Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Molecular weight determination and fractionation of poly(L-histidine) by gel filtration (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2749-2757 
    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: Durch Gelfiltration an einem Dextrangel (Sephadex G-75) und kontinuierlicher Anzeige bei 212 nm durch ein UV-Spektrophotometer wurde Poly(L-histidin), Poly[imino-1-(4-imidazolylmethyl)-2-oxoäthylen], fraktioniert und das Molekulargewicht bestimmt. In gepufferter Lösung erfolgt bei pH 2,35 einwandfreie Elution, während bei einem pH von 5,4 Adsorption an das Gel erfolgt. Die Gewichts- und Zahlenmittel der Molekulargewichte (Mn und Mw) wurden aus einer Eichkurve für das Molekulargewicht, die mit Proteinen erhalten wurde, ermittelt und nach der Methode von Smith korrigiert. Bei einem Ausgangswert des unfraktionierten PLH für Mw/Mn von 1,43 hatten die mit einem Essigsäure/Ammoniumacetat-Puffer erhaltenen Fraktionen Polydispersitäten Mw/Mn zwischen 1,14 und 1,22.
    Notes: Dextran gel filtration (using Sephadex G-75 gel) with a continuous monitoring system was applied to the determination of the molecular weight and for fractionation of poly(L-histidine), poly[imino-1-(4-imidazolylmethyl)-2-oxoethylene], (PLH). PLH was eluted satisfactorily with a pH 2,35 buffer, whereas it was adsorbed to the gel with a pH 5,40 buffer. The weight-average and number-average molecular weights (Mw and Mn) were determined from the calibration plot of molecular weight, obtained with proteins, and corrected by the Smith method. A highly fractionated “monodisperse” PLH with Mw/Mn = 1,14 to 1,22 was obtained from PLH with Mw/Mn = 1,43 by the use of a pH 4,95 acetic acid/ammonium acetate buffer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770916
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Laccase-catalyzed polymerization of urushiol in precisely confined Japanese lacquer systemDedicated to Prof. Dr. H. Kämmerer on the occasion of his 65th birthday. (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 47-61 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Japanese lacquer is a sole, enzymatically drying natural lacquer, giving films with excellent durability. Oligomerization of urushiol (1) (a major component of the lacquer) in the lacquer system was reviewed. The enzymic formation of the urushiol-quinone (3) from urushiol was studied by laccase-catalyzed reactions with pyrocatechols. On the basis of the separated urushiol dimers in both the lacquer and model reaction systems, a nonenzymatic C—C and C—O coupling reaction of the urushiol-quinone with the unsaturated chain or with the nucleus of urushiol is discussed as significant reaction path in the polymerization of Japanes lacquer. The films of the lacquer made by a mild oxidation process, a technique applied for so long time in practice, retained their dynamechanical properties completely over 16 years.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 2Part 1. cf. 10.. Copolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2375-2391 
    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: Die radikalische Copolymerisation von Cyclododecylacrylat (CDA) mit Styrol (St) und mit Acrylnitril (AN) wurde bei 60°C untersucht und zwar sowohl für die Mischung der reinen Monomeren als auch für ihre Lösungen in Benzol, Tetrahydrofuran und Dioxan. Analoge Copolymerisationsversuche wurden zum Vergleich mit Cyclohexylacrylat (CHA) ausgeführt.Bei der Copolymerisation mit Styrol verhalten sich beide Acrylate sehr ähnlich dem Methylmethacrylat. Dabei wird die Reaktivität beider Acrylate durch die Effekte der verschiedenen Estergruppen und der Lösungsmittel in gleicher Weise beeinflußt wie bei ihrer Homopolymerisation.Dagegen wurden bei der Copolymerisation von CDA mit AN gegenüber dem CHA Besonderheiten gefunden. In benzolischer Lösung sind beide Copolymerisationsparameter r1 und r2 größer als 1 (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0) und durch charakteristische Assoziationserscheinungen beider Monomerer in Lösung gedeutet.
    Notes: The radical copolymerization of cyclododecyl acrylate (CDA) with styrene (St) or acrylonitrile (AN) was studied in bulk, benzene, tetrahydrofuran, or dioxane at 60°C, and was compared with that of cyclohexyl acrylate (CHA).In the copolymerization with St, the change in the ester groups or the used solvents influenced the reactivity of both acrylates in the same manner as their homopolymerization rates. Approximately, CDA and CHA behaved like methyl methacrylate in the copolymerization with St.Contrary, in the cases of copolymerization of CDA with AN, peculiar results were obtained and interpreted in terms of characteristic association states of the monomers in the solutions. In benzene solution both the monomer reactivity ratios, r1 and r2, are larger than unity (M1 = AN, M2 = CDA; r1 = 1,7, r2 = 2,0).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Solvent effects on radical polymerization of cyclododecyl acrylate, 1. Homopolymerization (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2359-2373 
    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: Die radikalische Homopolymerisation von Cyclododecylacrylat in Benzol, Tetrahydrofuran und Dioxan als Lösungsmittel wurde bei 60°C untersucht und mit der Polymerisation des Cyclohexylacrylates verglichen. Die beobachteten Differenzen der Polymerisationsgeschwindigkeiten beider Acrylate sind nicht mit den polaren und sterischen Substituentenkonstanten der Estergruppen in der Taft-Gleichung zu erklären. Darüber hinaus wurden auch bemerkenswerte Lösungsmitteleffekte bezüglich der Polymerisationsgeschwindigkeit gefunden und dem unterschiedlichen polaren Charakter der Lösungsmittel zugeschrieben.
    Notes: The radical homopolymerization of cyclododecyl acrylate at 60°C in benzene, tetrahydrofuran, or dioxane was studied and compared with that of cyclohexyl acrylate. The difference in the polymerization rates of the acrylates could not be interpreted in terms of the polar and steric substituent constants of ester groups in Taft's equation. Remarkable solvent effects on the polymerization rates for both acrylates were also found in the same manner and ascribed to the polar nature of the used solvents.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760814
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Viscoelastic properties of epoxy resins. III. Effect of molecular weight of antiplasticizers in highly crosslinked antiplasticization system (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 1257-1266 
    Details
    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: Antiplasticization, defined as an increase in glassy modulus of polymers upon dilution with low molecular weight compounds, was studied for highly crosslinked epoxy resins. A series of oligomers with average molecular weight 500-4000 was incorporated with epoxy resins for elucidating the effect of their molecular weight on antiplasticization. The antiplasticization was found to be dependent on the molecular weight of the oligomers used. It was most evident when the lowest molecular weight oligomer was incorporated, and seems to be suppressed by increasing molecular weight of the oligomers. These results were discussed in correlation with the behavior of dynamic mechanical properties and the changes in specific volume as a function of the epoxy resin and diluents.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210508
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Molecular motion in poly(L-histidine) in the solid state (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 379-391 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Molecular motions in poly(L-histidine) (PLH) and its hydrochloride in the solid state have been studied by NMR and dielectric measurements. Four relaxation processes, β,γ,δ, and ε, are observed for PLH. The δ relaxation is assigned to rotation of an imidazole ring about the Cβ—Cγ bond, since the observed activation energy of 2.7 kcal/mole agrees with the calculated energy barrier for rotation of the central imidazole ring about Cβ—Cγ in an imidazole trimer model and the experimentally determined dielectric relaxation strength is consistent with the theoretically estimated value based on the two-state transition theory. The γ relaxation was attributed to the restricted rotational motion about Cα—Cβ. The β relaxation is related to motion of water molecules bound by PLH. The ε relaxation is assigned to the wagging mode of imidazole groups in the defect region as observed for polymers containing pendent aromatic rings. No relaxation is observed in the hydrochloride of PLH due to the increased interaction between imidazolium cations as side groups. This is confirmed by the comparison of dipole moments of protonated and deprotonated imidazoles estimated by molecular-orbital calculations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170305
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...