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  • Polymer and Materials Science  (1,103)
  • Wiley-Blackwell  (1,103)
  • American Chemical Society
  • American Geophysical Union
  • PANGAEA
  • 1990-1994  (837)
  • 1965-1969  (266)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (1,103)
  • American Chemical Society
  • American Geophysical Union
  • PANGAEA
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic characterization of interpenetrating polymer networks of poly (carbonate-urethane) and poly (methyl methacrylate) (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2625-2628 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crosslinked poly (methyl methacrylate) and poly (carbonate-urethane) as well as full interpenetrating network on their base (IPN) were characterized by precise heat capacity measurements in the temperature interval 1.2-150 K. As judged by the positive sign of the excess Gibbs free energy in the whole temperature interval above 30 K, the apparently single-phase state of IPN is thermodynamically unstable; however, its kinetic stability is ensured by permanent chamical crosslinks prohibiting the incipient phase separation. © 1994 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321403
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und Eigenschaften von aromatischen Polyamiden, die durch Matrizen-Polykondensation bei niedrigen Temperaturen erhalten wurdenHerrn Professor Dr. sc. nat. Gerhard Reinisch zum 60. Geburtstag gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 489-492 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymer mixtures of poly(phenylenebenzimidazole terephthalamide) and poly(anilinfluorene terephthalamide) have been prepared by synthesis of the one polymer in the matrix of the other. The effect of the matrix polymer on the creep, deformation, and strength behaviour of films made from the polymer mixtures is investigated.
    Notes: Polymermischungen aus Poly(phenylenbenzimidazolterephthalamid) und Poly(anilinfluorenterephthalamid) wurden durch Synthese eines Polyamids in der Matrix des anderen hergestellt. Der Einfluß des Matrix-Polymers auf das Kriech-, Deformations- und Festigkeitsverhalten von Folien aus den Polymermischungen wurde untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410905
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and properties of self-protecting polyarylates (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 157-172 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Self-protective polyesters were synthesized in two ways: by polymer analog transformations on polymers obtained and by introduction of inhibiting groups into the polymer during synthesis. It is shown that the Fries rearrangement takes place in the aromatic polyesters in the presence of the Friedel-Crafts catalysts and on ultraviolet irradiation as well. Thermogravimetric analysis of the rearranged polymers and investigations of the influence of the ultraviolet irradiation on their properties show that the rearrangement markedly increases the photochemical and thermal stability of the polymers. Photostabilization may also be accomplished by the introduction of inhibiting groups, such as hydroxyl, sulfur, or phosphorus into the polymer molecule.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070114
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  • 4
    Electronic Resource
    Electronic Resource
    Thermostability of some isomeric polyoxadiazoles (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1351-1365 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal stability of the isomeric poly-1,2,4-oxadiazole (PO-2) and poly-1,3,4-oxadiazole (PO-3) was investigated. The isomerism of the ring substantially influenced polymer thermostability. The weight losses in PO-2 occur above 220-230°C. in vacuo, but PO-3 degrades only at 280-300°C. The weight changes in isomeric polyoxadiazole at lower temperatures are connected with the completion of the cyclization process. At higher temperatures degradation of the oxadiazole ring takes place, and as a result carbon and nitrogen oxides, 4,4′-dicarboxy (diphenyl ether) dinitrile and other products are evolved. The mechanism of polymer thermal degradation is examined; it is shown that the weakest bonds are C—O and N—O. These data are in a good agreement with the results of calculation of the π-electron systems of unsubstituted oxadiazole cycles in the framework of the molecular orbital treatment in the Hückel approximation. It is shown that the oxygen in the oxadiazole ring oxidizes the products of thermal degradation of polymers and a cell effect takes place. The thermal oxidation of isomeric polyoxadiazoles does not differ essentially from the degradation in vacuo. It was found that the formation of intermediate products such as peroxides and hydroperoxides does not take place, and oxygen does not act as an initiator of polymer degradation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060526
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of polymer structure inhomogeneity on oxygen quenching of phenanthrene phosphorescence in poly(methyl methacrylate) (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 951-958 
    Details
    ISSN: 0887-6266
    Keywords: PMMA structure inhomogeneity ; oxygen quenching of phenanthrene ; the kinetics of phosphorescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Decay kinetics of phenanthrene phosphorescence in atactic poly(methyl methacrylate) have been studied at 130-170 K in the presence of dissolved oxygen. The kinetics show anomalous behavior and cannot be described in terms of homogeneous diffusion of oxygen. Analysis of the dependence of the kinetics on oxygen concentration shows that such behavior is well accounted for by a polychromatic model assuming a dispersion of diffusion coefficients due to the inhomogeneity of the polymer structure. Possible errors in determining the diffusion coefficient from the phosphorescence quantum yield on the assumption of homogeneous diffusion are discussed. © 1992 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300903
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  • 6
    Electronic Resource
    Electronic Resource
    Oriented purple membrane multilayers of halobacteria fabricated by langmuir-blodgett and electrophoretic sedimentation techniquesPresented at the Second International Symposium on Molecular Electronics and Biocomputers, Moscow, 11-18 September 1989. (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 1 (1992), S. 105-115 
    Details
    ISSN: 1057-9257
    Keywords: Monolayers ; Langmuir-Blodgett technique ; Bacteriorhodopsin ; Halobacteria ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Organised films containing oriented patches of purple membranes and consisting of 15-75 layers and approximately 1000 layers were fabricated by the Langmuir-Blodgett and electrophoretic sedimentation techniques respectively. ‘Surface pressure vs. molecular area’ isotherms for monolayers of purple membranes suspended in hexane and deposited on the air/water interface were studied. Circular dichroism and absorption spectroscopy were used to investigate the effect of an organic solvent on the chromophore binding site in the purple membranes. Kinetic methods based on flash excitation were employed to determine the influence of the film deposition conditions on the photoelectric response of bacteriorhodopsin and on the M412 intermediate relaxation. Structural characteristics for multilayers prepared from water and hexane purple membrane suspensions were determined by low-angle X-ray scattering. The influence of the layer deposition conditions on the electrical, physical and photoelectrical properties of ordered structures containing bacteriorhodopsin is discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860010302
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  • 7
    Electronic Resource
    Electronic Resource
    A model of molecular electronics based on the concept of conjugated lonic-hydrogen bond systems (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 4 (1994), S. 203-218 
    Details
    ISSN: 1057-9257
    Keywords: Conjugated ionic-hydrogen bond systems ; Biostructures ; Biomolecules ; Molecular electronics ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: A new model of lmolecular electronics is proposed as an alternative to the ‘soliton logic’ developed by Carter. The model is based on the principles of continuity of conjugated ionic-hydrogen bond systems (CIHBSs) in the construction of supramolecular structures and conjugation through the hydrogen bond in energy transduction. It is presumed that these principles are realized in biostructures. The Concept implies a symmetrica oligomeric organisation of supramolecular structures and an oscillatory mode of their functioning. The basic architecture and basic elements have been identified. The basic architecture is determined by periodic CIHBSs. The latter have been analysed in proteins, nucleoproteids and biomembranes. The basic elements contain groups capable of building in CIHBSs. Charge generators, valves and other basic elements contain groups capable of building in CIHBSs. Charge generators, valves and other basic elements have been distinguished among biomolecules. Oligomeric enzymes have been suggested as functional prototypes of molecular processors-multivibrators where CIHBSs form Feedback loops and Provide energy recuperation. Technologcal aspects of designing molecular electronic devices on CIHBS principles have been considered. The most challenging and complicated problem is the creation of supramolecular structures with properties which can be specified in advance. Synthesis of membrane two-dimensional active media capable of storing and processing information in the mode of parallel fluxes is suggested as the most promising route for the fabrication of biochips.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860040304
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  • 8
    Electronic Resource
    Electronic Resource
    Poly-C-vinyltetrazoles: A new type of polyacid (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1903-1906 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310729
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal decomposition of glassy poly(di-t-butyl fumarate) as a topochemical reaction (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 395-401 
    Details
    ISSN: 0887-624X
    Keywords: poly(di-t-Butyl fumarate) ; thermal decomposition ; kinetics ; autocatalysis ; solid-phase reaction mechanism ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Decomposition of t-butyl carboxylate (TBC) groups in a glassy poly(di-t-butyl fumarate) (PDTBF) at 140-170°C proceeds with a sharp acceleration caused by interchain interaction of TBC and carboxylic groups. According to selective dissolution data, at 70% degree of conversion the reaction system contains both unchanged PDTBF and a final product: poly(fumaric acid). For TBC groups decomposition in di-t-butyl fumarate (DTBF)-styrene copolymers above their Tg an apparent rate constant of autocatalysis increases with the increase of DTBF content in copolymer. Together with previously obtained x-ray data these results lead to conclusions about the topochemical character of the PDTBF decomposition. The mechanism suggested includes thermal decomposition of TBC groups (initiation), autocatalytic growth of spheric clusters up to a critical size (an appearance of primary germs of the new phase), and growth and branching of thread-like germs. A mathematical model based on these assumptions describes quantitatively the kinetic data. © 1993 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310212
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  • 10
    Electronic Resource
    Electronic Resource
    Dependence of the hydration shell structure in the minor groove of the DNA double helix on the groove width as revealed by monte carlo simulation (1991)
    New York : Wiley-Blackwell
    Biopolymers 31 (1991), S. 1445-1453 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydration shell of several conformations of the polynucleotides poly(dA) · poly(dT), poly (dA) · poly (dU), and poly (dA-dl) · poly (dT-dC) has been simulated using the Monte Carlo method (Metropolis sampling). Calculations have shown that the structure of the hydration shell of the minor groove greatly depends on its width. In conformations with a narrowed minor groove, the first layer of the hydration shell of this groove has only one molecule per nucleotide pair that forms H bonds with purine N3 of one pair and pyrimidine O2 of the next pair. The second layer of the hydration shell of such conformations contains molecules that form H bonds between two adjacent molecules of the first layer. The probability of formation of hydration spine is about 20% while the bridges of the first layer are formed with a probability of about 70%.In the first layer of the minor groove of the B-DNA conformation with wide minor groove there are approximately two water molecules per base pair that form H bonds with purine N3 or pyrimidine O2 and with the sugar ring oxygen of the adjacent nucleotide. The probability of simultaneous H bonding of a water molecule with N3 (or O2) and O of sugar ring is about 30%.The results of simulation suggest that hydration spine proposed for the narrowed minor groove of oligonucleotide crystals [H. R. Drew, and R. E. Dickerson (1981) Journal of Molecular Biology, Vol. 151, pp. 535-556] can be formed in fibers of poly (dA) · poly (dT), poly (dA) · poly (dU), and poly (dA-dl) · poly (dT-dC) as well as in DNA fragments of these sequences in solution. The role of the hydration shell of the minor groove of DNA double helix in stabilization of certain B-family conformations is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360311211
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