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  • Polymer and Materials Science  (1,280)
  • Wiley-Blackwell  (1,280)
  • American Chemical Society
  • American Geophysical Union
  • PANGAEA
  • 1990-1994  (837)
  • 1970-1974  (443)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (1,280)
  • 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
    On rotational isomerism of polyarylates (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 10 (1972), S. 429-431 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.110100604
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations of the structure of polyphenylenes based on ketone acetals by infrared spectroscopy (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 3475-3485 
    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 Struktur der durch Polycyclokondensation von Ketonacetalen aromatischer Acetylverbindungen dargestellten Polyphenylene wurde IR-spektroskopisch untersucht. Es konnte gezeigt werden, daß sich bei der Polycyclokondensation 1,3,5-substituierte Benzolringe bilden, die durch spezifische Absorptionsbanden bei 880 und 1 400 cm-1 charakterisiert werden. Die IR-Daten erlauben, die Anwesenheit von defektiven (d. h. nichtaromatischen) Fragmenten in den Polymerketten abzuschätzen.
    Notes: The structure of polyphenylenes obtained by polycyclocondensation of ketone acetals of aromatic acetyl compounds was investigated by IR spectroscopy. It could be shown that in the course of polycyclocondensation 1,3,5-substituted benzene rings are formed, which are characterized by the specific absorption bands at 880 and 1 400 cm-1. The spectral data permit the evaluation of defective (non-aromatic) fragments in the polymer chains.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021751213
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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
    Some problems of nonequilibrium copolycondensation (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2209-2223 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of the reactivity of the starting compounds and reaction conditions on the formation of the macromolecules of copolymers has been investigated for a nonequilibrium copolycondensation in solution by acceptor-catalytic polyesterification. In the nonequilibrium copolycondensation in solution, copolymers with different distributions of units may be formed, depending on various factors. Introduction of all amounts of acid chloride (intermonomer) in the beginning of the nonequilibrium copolycondensation leads to the formation of copolymers with statistical distribution of the units independent of the difference in reactivity of the comonomers used. For synthesis of copolymers with a block structure by one-stage nonequilibrium polycondensation in solution the initial comonomers must have different reactivities (r ≠ 1) and the rate of intermonomer introduction must be lower than that of its reaction with the more reactive comonomer. On varying the above factors, block copolymers with different lengths of block segments may be obtained.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110912
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of physical state and phase behavior of polyester-imides (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 1375-1383 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Changes in properties of linear aromatic heterocyclic polymers of the polyimide class after introduction of ester linkages into their dianhydride component and of the oxygen and sulfur atoms into their diamine component have been studied. Thermomechanical, dilatometric, thermographic characteristics and x-ray diffraction patterns of poly(ester amic acids) and polyester-imides have been investigated. On heating, poly(ester amic acids) and amorphous polyesterimides exhibited a peculiar effect of self-orientation of macromolecules. The x-ray diffraction patterns of unoriented films indicate that they exhibit axial-planar texture with the c axis of macromolecules in the film plane. The formation of the texture is preceded by mutual arrangement of macromolecules, i.e., by a precrystallization process beginning in the amorphous state. Because of this, on heating at temperatures ranging from 200 to 380°C, polyester-imides yield highly crystalline products. Crystallographic parameters of the polymer lattices on x-ray diffraction patterns and dichroism of absorption bands in polarized infrared spectra, the most probable conformations of macromolecules of some polyesterimides are proposed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120702
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  • 10
    Electronic Resource
    Electronic Resource
    Studies of deoxyribonucleoproteins progressively depleted of proteins in solutions of various ionic strengths (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 863-877 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The conformation of deoxyribonucleoprotein (DNP) from calf thymus at different stages of deproteinization was studied.The dissociation of the first portion of histone produces no effect on the hydrodynamical and optical behavior of DNP particles. The conformational transition of a macromolecule was observed as soon as the ratio of protein to DNA ≤ 0.9.The effect of ionic strength on the conformation of DNP particles with high protein content was more strongly pronounced than that for DNA. On the contrary, DNP particles depleted of proteins (protein/DNA 〈 0.9) were found to be less sensitive than DNA to the variation of ionic strength. These data imply that the DNP molecules rich in proteins possess a superstructure that is destroyed as the protein/DNA ratio becomes 0.9.The data were analyzed in view of current theories on various model concepts. The most probable model to describe the DNP molecule was chosen by comparing the calculated and experimentally obtained parameters. We believe that DNP is best described as a “compressed coil,” possibly including superhelical regions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130503
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