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
  • Chemistry  (7)
  • 2020-2024
  • 1965-1969  (5)
  • 1960-1964  (2)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Mechanical properties of poly(glutamic acid) in aqueous solution (1969)
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 453-458 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction between ionizable carboxyl groups and the conformation of poly-(glutamic acid) (PGA) in aqueous solution were investigated by the mechanical method. The dynamic rigidity of the PGA solution has a maximum value at the pH corresponding to about 50% neutralization point. This may be due to establishing of a maximum attractive force by proton/charge fluctuation between ionizable carboxyl groups at that pH. The dynamic viscosity has a sharp change in the region of pH 5.5-6.5. It is suggested that this behavior is due to the helix-coil transition.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360070404
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Synthese von dl-Desoxynupharidinvgl. M. Kotake, I. Kawasaki, T. Okamoto, S. Kusumoto und T. Kaneko, Bull. chem. Soc. Japan 32, 892 (1959); T. Kaneko, I. Kawasaki und T. Okamoto, Chem. and Ind. 1959, 1191. (1960)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 636 (1960), S. 158-164 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Synthese von dl-Desoxynupharidin (I), eines 1.7-Dimethyl-4-[furyl-(3)]-chinolizidins, aus 2.5-Lutidin wird beschrieben. Das IR-Spektrum des synthetischen Desoxynupharidins ist praktisch mit dem des natürlichen Alkaloids aus Nuphar japonicum identisch.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19606360116
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The solvent effect on the polymer-solvent interaction in polymer solutions (1965)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 82 (1965), S. 205-212 
    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: Viskositätsmessungen liefern Angaben über die Parameter der thermodynamischen Wechselwirkung zwischen Polymerem und Lösungsmittel. Die Viskosität von Polydimethylsiloxan-Lösungen wurde in mehreren Lösungsmitteln bei verschiedenen Temperaturen gemessen, um die Auswirkung der geometrischen und chemischen Natur der Lösungsmittel auf die thermodynamische Wechselwirkung zu untersuchen. Die Parameter der Verdünnungswärme und der Verdünnungsentropie für Polydimethylsiloxan-Lösungen wurden aus dem STAUDINGER-Index bestimmt. Wir fanden große Unterschiede in den Verdünnungsentropieparametern der verschiedenen Lösungsmittel. Die unterschiedlichen Verdünnungsentropien können aus der Geometrie der Lösungsmittelmoleküle und der bevorzugten Ordnung in der Lösung erklärt werden.
    Notes: Viscosity measurements afford data for the parameters governing the thermodynamic interaction between polymer and solvent. Viscosities of polydimethylsiloxane solutions were measured in several solvents at different temperatures with the object of examinating the effects of the geometrical and chemical nature of solvent on the thermodynamic interaction. The pair interaction heat and entropy parameters for polydimethylsiloxane solutions were derived from the intrinsic viscosity. It was found that the pair entropy parameters differes widely for polydimethylsiloxane in different solvents. The large variation in the entropy parameters may be attributed to the preferential ordering induced in solution in addition to the size and the shape of the solvent molecule.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1965.020820119
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Preparation of polyvinyl alcohols membrances (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 110 (1967), S. 294-296 
    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 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021100129
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The dependence of excimer formation of polystyrene solutions on solvent and concentration (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 124 (1969), S. 84-90 
    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: In verschiedenen Lösungsmitteln wurden die Fluoreszenz-Spektren des Polystyrols gemessen. Das Verhältins der Intensität ID der Excimer(kurzlebendes, angeregtes Dimeres)-Bande zu der Intensität lM der Monomer-Bande hängt vom Lösungsmittel ab. Die Werte können, extrapoliert nach kleinen Konzentrationen, zur durehschnittlichen Segmentdichte im Polyimermolekül in Beziehung gesetzt werden. Oberhalb der Konzentration 0,1 g/100 ml Wächst das Verhältnis ID/IM mit der Konzentration an, und die Excimer-Bande verschiebt sich nach längerer Wellenlänge
    Notes: The fluorescence spectra of polystyrene solutions have been measured in various solvents. The ratio of the intensity ID of the excimer (short living excited dimer) band to the intensity IM of the monomer band depends on the solvent. The values extrapolated to diluted solutions may be related to the average density of segments in a polymer molecule. Above concentrations of 0.1 g/100 ml, the ratio ID/IM increases with increasing concentration, and the peak position of the excimer band shifts to a longer wavelength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021240109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Dipole moment, stress relaxation, and birefringence of viton fluoroelastomer (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1-14 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dielectric constant of a crosslinked sheet of Viton was measured at two frequencies, 200 cycles/sec. and 100 kcycles/sec., for various elongations. The difference (∊s - ∊∞) decreased sharply when the sample was strained and then increased slowly during stress relaxation. Relaxation was slow at the temperature of these measurements (35°C.), so that we were only able to estimate the behavior at long time for the lowest elongations. Even under these conditions it was possible to demonstrate that the (∊s - ∊∞) values corresponding to long times decrease with elongation. The root mean square dipole moments for a C5F8H2 group are estimated from these data by both a modified form of the Onsager relation and the more recent treatment of Harris and Alder. Stress relaxation and birefringence measurements were performed with elongation and temperature as variables. Viton exhibits linear viscoelastic behavior up to an elongation a of 1.5. The isothermal data indicate a linear relationship between birefringence and stress, both during stress relaxation and recovery. The streas-optical coefficient, C, is 2.35 × 10-4 cm.2/kg. at 28°C. Master curves could be constructed from both the reduced stress and birefringence data a t different temperatures for the same shift factors, aT. The apparent activation energy i s 56 kcal./mole and the characteristic temperature in the simplified WLF equation is TS, = 336 ± 5°C. The birefringence as measured under essentially equilibrium conditions at α = 1.23 was independent of temperature in the range 30-70°C.; however, the CT product measured during relaxation increased from 7 × 10-2 to 8.8 × 10-2 in the same temperature interval. The data were insufficient to determine whether this departure from Gaussian behavior arose from the time dependence or represented an equilibrium effect.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Unperturbed dimensions of polystyrene derivatives (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 985-994 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Several methods have been developed for estimating the unperturbed dimensions of polymer chains without measurements under theta conditions. Osmotic pressure and viscosity measurements have been performed to test the applicability of the methods of estimating the unperturbed dimensions. It has been observed that the Kurata-Stockmayer and Stockmayer-Fixman methods are applicable to poly-p-methylstyrene and poly-p-chlorostyrene in nonpolar and polar solvents. The effect of halogenation at the para position to internal rotation has been given by a comparison of the unperturbed dimensions for poly-p-methylstyrene and poly-p-chlorostyrene.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030312
    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...