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  • Chemistry  (36)
  • Polymer and Materials Science  (14)
  • 1990-1994  (18)
  • 1985-1989  (14)
  • 1925-1929  (3)
  • 1900-1904  (1)
  • 11
    Electronic Resource
    Electronic Resource
    The irreversible binding of 2-site ligands to hetereogeneous polymers (1990)
    New York : Wiley-Blackwell
    Biopolymers 29 (1990), S. 1331-1349 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We obtain an analytical solution for the binding of 2-site ligands to a heterogeneous lattice. The model also describes the kinetics of chemical reactions between adjacent pendant groups of a copolymer. Our analysis is based on the principle of independence, as formulated by Gonzalez and Hemmer. Several special cases are solved in closed form; a power series solution is developed for the general problem. The results may be modified to take into account fixed total ligand. We also analyze competition between 1-site and 2-site ligands. As an illustration of the results, we examine in detail the kinetics and final extent of binding for two special cases.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360291002
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  • 12
    Electronic Resource
    Electronic Resource
    A new process for fabricating nonwoven fibrous-reinforced elastomer composites (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 45 (1992), S. 1693-1704 
    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: A new type of mold was developed and tested for structural reaction injection molding (SRIM) of elastomer composites having polymer matrices made from a mixture of two components. These mixtures had short pot lives and relatively high viscosity. Channel systems for polymer feeding and vacuum application were investigated. The mold cavity was provided with up to 24 polymer feeding holes and 38 vacuuming holes. The cavity and channels were made from transparent materials that allowed easy observation and video recording of the polymer matrix flow. In addition, some design parameters were studied such as channel layout. Investigations were carried out on the mechanism of polymer matrix flow and fiber breakage during the formation of fiber-reinforced composites made of non-woven fiber reinforcement structures with considerably longer fiber lengths than reported earlier. Other studies included determination of the effects of fiber type, fiber dimensions, and fiber/matrix v/v ratio on the matrix flow during impregnation. © 1992 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070451002
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  • 13
    Electronic Resource
    Electronic Resource
    A new process for fabricating nonwoven fibrous-reinforced elastomer composites (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 375-375 
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070460219
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  • 14
    Electronic Resource
    Electronic Resource
    Studies related to in-plane flow behavior of elastomer matrix in nonwoven fibrous structures (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 1629-1646 
    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: The purpose of the present work has been to produce knowledge as regards the rheological behavior of polymer matrix in nonwoven fibrous reinforcing structures for composites. The results are expected to contribute toward a better understanding of flow mechanisms in fibrous systems in order to develop better techniques for fabricating elastomer-based composites. Theoretical and experimental analyses have been made of interactions between the structural parameters of the fibrous mats and the flow characteristics of the matrix with systematically varied material and process parameters. In nonwoven mats with fibers laid lengthwise, the flow rate along the fiber direction was found to be significantly higher than the flow rate crosswise to the fiber direction. Nonwoven mats with multidirectionally laid fibers exhibited a practically radial flow front pattern. Nonwoven mats made of coarser fibers showed greater matrix polymer flow rate as compared with finer fibers. The matrix flow distance was proportional to the logarithm of injection time. The decrease of pressure in the mold cavity was linearly proportional to the matrix flow distance. The dependence of permeability on the level of compression of the fibrous structure is in agreement with the results published by other workers. © 1994 John Wiley & Sons, Inc.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510913
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  • 15
    Electronic Resource
    Electronic Resource
    Synthesis of polyaniline/polytoluidine block copolymer via the pernigraniline oxidation state (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 89-93 
    Details
    ISSN: 0959-8103
    Keywords: polyaniline ; pernigraniline oxidation state ; copolymer ; synthesis ; electrochemistry ; 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: Polyaniline was electrochemically synthesized in the emeraldine oxidation state and then converted to the pernigraniline oxidation state by applying an electric potential under optimized conditions. The stability/reactivity of polyaniline in the pernigraniline oxidation state was evaluated in various aqueous media. The products of the reduction of the pernigraniline oxidation state by o-toluidine were analyzed by gel permeation chromatography, ultraviolet-visible and infrared spectroscopies, and cyclic voltammetry. The results are consistent with the synthesis of a diblock copolymer of polyaniline/poly(o-toluidine) and also of some poly(o-toluidine) homopolymer in the emeraldine oxidation state as a side product.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210350110
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  • 16
    Electronic Resource
    Electronic Resource
    Fabrication methods for latex-based elastomer composites reinforced with long discontinuous fibers (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 263-277 
    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: Rubber- or elastomer-based composites have so far been reinforced with randomly dispersed staple fibers of very short lengths. In this work, methods have been devised to produce composites where the dispersed fibers have considerably greater lengths. This achievement was possible by applying the rubber or elastomer as latex when mixing it with the fibers. As compared with earlier processes, the viscosity is considerably lower, thus permitting easier mixing so that longer staple fibers can readily be used.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440211
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  • 17
    Electronic Resource
    Electronic Resource
    Measurement of adhesion between fibers and fast curing elastomer resin (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 863-874 
    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: A method was developed to measure the adhesion between fibers and fast curing elastomer, in droplet form, using the microbond pull-out method. Samples were fabricated by arranging the fibers as a grid on which elastomer droplets were formed for testing. A droplet sliding test method was developed to investigate the nature of the sites of the droplets on the fiber after displacement of the droplets. Fibers of polyester, aramid, and HMW-polyethylene were tested with resins of polyurethane and natural rubber latex. The fibers had been surface-treated by corona, gamma radiation, or methanol extraction. The shape of the droplets was determined by microscopic measurement. The shear strength of the fiber/matrix bond was tested using a microvise grip in a tensile strength tester. © 1993 John Wiley & Sons, Inc.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500514
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  • 18
    Electronic Resource
    Electronic Resource
    Decamethylmanganocenium tetracyanoethenide, [Mn(C5Me5)2]⊙⊙⊕ [TCNE]⊙⊖ - a molecular ferromagnet with an 8.8 K TcWe gratefully acknowledge support from the U.S. Department of Energy Division of Materials Science Grant No. DE-FG02-86ER45271.A000. We appreciate the powder X-ray diffraction analysis kindly provided by C. Foris and G. Hyatt. (1991)
    Weinheim : Wiley-Blackwell
    Advanced Materials 3 (1991), S. 309-311 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19910030609
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  • 19
    Electronic Resource
    Electronic Resource
    Brain biocompatibility of a biodegradable, controlled-release polymer in rats (1989)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 23 (1989), S. 253-266 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: We report the biocompatibility in the rat brain of a controlled-release, biodegradable polymer, the polyanhydride poly-[bis(p-carboxyphenoxy)propane-sebacic acid] copolymer (PCPP-SA) in a 20:80 formulation. The biodegradable polyanhydride can be used for drug delivery directly into the brain, circumventing the difficulties posed by the blood - brain barrier and avoiding the consequences of having to administer toxic doses systemically to reach therapeutic doses in the central nervous system. The tissue reaction in the presence of PCPP-SA was compared to that seen with other standard neurosurgical implants. Fifty-six adult Sprague-Dawley rats were assigned to one of seven groups and underwent bilateral frontal lobe implantation of PCPP-SA (42 hemispheres), Surgicel (oxidized regenerated cellulose) (35 hemispheres), or Gelfoam (absorbable gelatin sponge) (35 hemispheres). None of the animals showed any behavioral changes or neurological deficits suggestive of either systemic or localized toxicity from the biodegradable polyanhydride, all surviving to the scheduled data of sacrifice. PCPP-SA evoked a well localized inflammatory reaction, comparable to that of Surgicel, which resolved as the PCPP-SA polymer degraded over five weeks. The biodegradable polyanhydride has been shown in this study to be nontoxic and biocompatible in the rat brain, when compared to standard neurosurgical implants.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820230209
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  • 20
    Electronic Resource
    Electronic Resource
    Steuerung der elektronischen Struktur organischer Leiter am Beispiel von [NMP][TCNQ]-Charge-Transfer-Komplexen (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 99 (1987), S. 332-339 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Austausch von Kationen gegen Neutralmoleküle ähnlicher Form und Polarisierbarkeit in einem hochleitfähigen („metallischen“) organischen Charge-Transfer-Komplex ermöglicht die gezielte Einstellung von dessen elektronischer Struktur vom viertel- zum halbgefüllten Band. Verwirklicht wurde dieses Konzept in idealer Weise am N-Methylphenazinium(NMP)-Salz des Tetracyanchinodimethan(TCNQ)-Anions; bei diesem Salz läßt sich das Kation partiell gegen Phenazin austauschen. Eine detaillierte Untersuchung der optischen, elektrischen und magnetischen Eigenschaften der so erhaltenen leitfähigen molekularen Festkörper führte zu einem besseren Verständnis der Physik eindimensionaler organischer Leiter und zur Neuinterpretation des Mechanismus des Elektrontransports in diesen Festkörpern. Es wurden Phänomene wie der Übergang von einem „Zwei-Ketten-Leiter“ mit niedriger Coulomb-Abstoßung zum „Ein-Ketten-Leiter“ mit hoher Coulomb-Abstoßung und ein durch Solitonen unterstützter Elektronentransport beobachtet.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19870990408
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