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  • Polymer and Materials Science  (49)
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  • 1
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(phenylene oxides) (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 513-522 
    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 thermal degradation in vacuum of a number of halogenated poly(phenylene oxide) polymers has been studied by a weight loss method. In general the thermal stability decreased as the degree of substitution in the phenylene nuclei increased. The chloro derivatives were relatively more stable than the corresponding bromo derivatives. The majority of the polymers showed an initial rapid loss in weight followed by the formation of a highly stable residue. The good thermal stability of the simpler poly(phenylene oxides), coupled with their fusibility and solubility, indicate that they may be useful starting products for the preparation of practical materials.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090213
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  • 2
    Electronic Resource
    Electronic Resource
    Introduction of polymer samples into a microreactor (1963)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. S19 
    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: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1963.070070333
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal degradation of fluorine-containing polymers. PART II. Degradation in oxygen (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2951-2961 
    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 thermal degradation in oxygen of a number of fluorine-containing polymers has been studied by using a weight loss technique. The relative thermal stabilities of the different polymers have been determined and, where possible, the overall activation energy and frequency factors for their breakdown. The results have been compared with those for samples of the same polymers degraded in vacuum. There is little change in the relative thermal stabilities observed under both conditions, the fully fluorinated structures being the most stable. The changes in the rates of breakdown in the presence of oxygen are difficult to interpret in the absence of mechanistic information.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080637
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  • 4
    Electronic Resource
    Electronic Resource
    Calculation of the apparent viscosity of polystyrene melts (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 4 (1960), S. 121-121 
    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.1960.070041022
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal degradation of fluorine-containing polymers. Part I. Degradation in vacuum (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2935-2950 
    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 thermal degradation in vacuum of a number of fluorine-containing polymers has been studied by using a weight loss technique. The relative thermal stabilities of the different polymers have been determined and where possible the overall activation energy and frequency factors for their breakdown. The methods of assessment of the weight loss results are discussed. The most stable of the polymers are those which are fully fluorinated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080636
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  • 6
    Electronic Resource
    Electronic Resource
    Recent initiatives in the use of modern electrochemical instrumentation for FGD corrosion investigation and surveillance (1992)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 43 (1992), S. 321-328 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Neuere Initiativen bei der Verwendung moderner elektrischer Instrumentierung für Korrosionsuntersuchung und -überwachung in REA'sDie Arbeit gibt eine Übersicht der Entwicklung der modernen kontinuierlichen Korrosionsüberwachungstechnik im Laufe der vergangenen 12 Jahre. Zwar wurde diese Technik ursprünglich zur Untersuchung des Korrosionsverhaltens in trockenen Rauchgassystemen entwickelt, doch hat sie zunehmend auch auf anderen Gebieten Eingang gefunden. Mehrere neuere Anwendungen in REA's in den USA haben die Zweckmäßigkeit dieser Technik für die Kraftwerkstechnik betätigt.Die Arbeit beschreibt die instrumentelle Ausrüstung und gibt einen Überblick der Erfahrungen im Laboratorium und bei der betrieblichen Anwendung. Ebenso werden die Möglichkeiten künftiger Anwendungen zur Bekämpfung der Korrosion und der Verringerung der Korrosionswirkungen in der Kraftwerkstechnik und bei der Überwachung der Luftverschmutzung erörtert.
    Notes: The paper reviews the development of modern continuous corrosion surveillance technology during the past twelve years. Although originally developed to investigate corrosion behaviour in dry flue gas systems, the approach has found increasing use in other fields. Several recent applications in American flue gas desulphurisation (FGD) systems have confirmed its usefulness for the power generation industry.The paper presents a description of the instrumentation and reviews laboratory and in-plant applications experience. The potential for future use to control corrosion and mitigate its effects in power generation and airpollution control systems is also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19920430614
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  • 7
    Electronic Resource
    Electronic Resource
    A mathematical model for stress-driven diffusion in polymers (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 589-602 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A model for case II diffusion into polymers is presented. The addition of stress terms to the Fickian flux is used to produce the characteristics progressive front. The stress in turn obeys a concentration-dependent evolution equation. The model equations are analyzed in the limit of small diffusivity for the problem of penetration into a semiinfinite medium. Provided that the coefficient functions obey two monotonicity conditions, the solvent concentration profile is shown to have a steep front that progresses into the medium. The formulas governing the progression of the front are developed. After the front decays away, the long time behavior of the solution is shown to be a similarity solution as in Fickian diffusion. Two techniques for approximating the solvent concentration and the front position are presented. The first approximation method is a series expansion; formulas are given for the initial speed and deceleration of the front. The second approximation method uses a portion of the long time similarity solution to represent the short time solution behind the front.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270308
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  • 8
    Electronic Resource
    Electronic Resource
    Flow injection determination of methionine with amperometric detection at a stable modified electrode (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 239-242 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A glassy carbon electrode that is modified by electrodeposition of a film comprising mixed valence ruthenium oxide stabilized by cyano crosslinlks catalyzes the oxidation of methionine at 0.92 V vs. Ag/AgCl. A linear calibration curve is obtained for flow injection amperometry over the range 0.6-180 μM with a 0.2 M K2SO4 carrier at pH 2, a 7.5 μL sample volume, and a 1.0 mL/min flow rate. The sensitivity is 20 ± 0.3 nA/μM at a 0.07 cm2 electrode. With a single surface preparation, the sensitivity of the method remains constant over more than 3 weeks with daily use. The method also was used with carriers of the composition of common liquid chromatographic eluents such as various citrate-phosphate mixtures and a 0.1 M chloroacetic acid solution at pH 3.0 in 1% acetonitrile.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030317
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  • 9
    Electronic Resource
    Electronic Resource
    Electrochemical oxidation and determination of heparin at electrodes modified with ruthenium oxide or copper oxide (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 675-679 
    Details
    ISSN: 1040-0397
    Keywords: Heparin ; Modified electrodes ; Electrocatalysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical oxidation of full-size heparin (13-15 kDa) is demonstrated in 1 M H3PO4 at a glassy carbon electrode coated with a ruthenium oxide film. The pathway apparently is analogous to chemical oxidation by periodate. By comparison to currents from inorganic species, it is apparent that only about 2 electrons per mole are involved. Flow injection analysis (FIA) allowed determinations down to 2 μM heparin, but the calibration plot was nonlinear. Low molecular weight heparin (5-6 kDa) was not electroactive with this system. In basic solution at a glassy carbon electrode that is modified with a film of Cu2O, both full-size and low molecular weight heparin are oxidized. The pathways involved oxidative desulfation and attack on saccharide units with evolution of CO2. Linear calibration plots which extended into the sub-μM level were obtained by FIA. The detection limits, which were based on a value of 3 for the ratio of the signal to the standard deviation of replicates, were 9 nM for full-size and 20-30 nM for various low molecular weight heparin samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090903
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  • 10
    Electronic Resource
    Electronic Resource
    Polymeric amides from omega-amino acidsContribution No. 225 from the Chemical Department, Experimental Station, E. I. du Pont de Nemours & Co., Inc., Wilmington, Delaware. (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 85-95 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methods for the preparation of fiber-forming polymeric amides from ω-amino acids and The variation in melting points of the polymeric their amide-forming derivatives are described. The variation in melting points of the polymeric amides with increasing chain length of the recurring unit is discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030110
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