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  • Polymer and Materials Science  (170)
  • FLUID MECHANICS  (34)
  • 1980-1984
  • 1970-1974  (204)
  • 1974  (204)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1970-1974  (204)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies on akroflex CD antioxidant loss from neoprene rubber. I. The determination of antioxidant content and the loss mechanism during aging (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 3543-3553 
    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: An analytical procedure for determining the antioxidant (i.e., Akroflex CD) content in neoprene rubber has been developed. The method is based on the infrared absorption analyses of chloroform extractables from the cured rubber at 1600 cm-1 and 1300 cm-1. Good agreement is found between these two independent sets of measurements. In an attempt to elucidate the antioxidant loss mechanism found with neoprene, thermal aging studies were carried out over the temperature range of 80°-200°C. Using the infrared analytical procedure, antioxidant loss rates at the different temperatures were established. The activation energy value (5.1 kcal/mole) for the loss rate as well as other aging data suggest that the antioxidant is lost by a diffusion mechanism.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070181205
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  • 2
    Electronic Resource
    Electronic Resource
    ESCA investigation of the electronic structure of polyhexafluorobut-2-yneThis is considered as Part X of Reactions Involving Fluoride Ion and Part VI of Applications of ESCA to Structure and Bonding in Polymers. A preliminary account of this work has been presented at the Faraday Discussion Meeting No. 54 on the photoelectron spectroscopy of molecules, Sussex University, 1972. (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 1647-1652 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyperfluorobut-2-yne is prepared by a fluoride ion-induced polymerization of hexafluorobut-2-yne. The mass spectrum indicates a regular fragmentation pattern but the ESCA spectrum establishes the structure as a polyene, rather than a crosslinked system, and the occurrence of a shake-up peak assists in this assignment.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120805
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  • 3
    Electronic Resource
    Electronic Resource
    Kohlenstoffäden (1974)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 40 (1974), S. 423-443 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Since a few years the development of carbon fibres from polyacrylonitrile (PAN) is concentrated in particular on improvements of the stabilization stage, i.e. of the early stage of the thermal degradation of PAN.The chemical and physical changes of PAN in the temperature range from 150 to 350°C influencing the properties of carbon fibres are discussed. According to the complex reaction process there exists a variety of possible technical procedures. In conformity with the actual knowledge it may be advantageous to substitute the usual stabilization treatment of PAN in air by a catalytic treatment in fluid reaction mediums. Nitroaromatic compounds in the presence of SnCI4 adducts are most suited for this purpose. In this way a remarkable shortening of the stabilization time is realized without diminishing the quality of the resulting carbon fibres.
    Notes: Die Entwicklung von Kohlenstoff-Fasern aus Polyacrylnitril (PAN) konzentriert sich seit einigen Jahren insbesondere auf Verfahrensverbesserungen der sog. Stabilisierungsstufe, d. h. auf das Frühstadium des thermischen Abbaus von PAN.Es werden die chemischen und physikalischen Veränderungen des PAN im Temperaturbereich zwischen 150 und 350°C diskutiert, die die Endeigenschaften der Kohlenstoff-Fasern wesentlich bestimmen. Aufgrund des komplexen Reaktionsgeschehens ist der Stand der Technik durch eine Vielfalt von möglichen Verfahrensvarianten gekennzeichnet. Nach dem heutigen Wissensstand ist es naheliegend, die herkömmliche Stabilisierungsbehandlung des PAN in Luft durch eine katalytisch beschleunigte Behandlung in flüssigen Reaktionsmedien zu ersetzen. Für eine solche Behandlung eignen sich insbesondere Nitroaromaten in Gegenwart von SnCl4-Addukten. Dadurch wird eine erhebliche Verkürzung der Stabilisierungszeit ohne nachteilige Qualitätseinbußen bei den resultierenden Kohlenstoff-Fasern erzielt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1974.050400120
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  • 4
    Electronic Resource
    Electronic Resource
    Metallographic characterization of rubber-modified poly(methyl methacrylates)Part of this work was previously reported at the International Association for Dental Research, Las Vegas, 1972. (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 143-154 
    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 microstructure of rubber-modified samples of poly(methyl methacrylates) was characterized by depositing a thin layer of gold on a polished surface and then applying the conventional techniques of metalography. Samples were prepared with a known volume fraction of rubber comprising particles of known size. It was shown that the methods of quantitative microscopy were successful in estimating these parameters. The method was also shown to provide information about crazing or cracking, which was viewed near the tip of an arrested crack. It is recommended that adoption of the metallographic method be extended to characterize other polymeric systems.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180113
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of stoichiometric concentration of hardener and percentage styrene oxide diluent on the crosslinking and mechanical properties of an epoxy resin cured with DEAPA (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1043-1052 
    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: Epoxy resin was cured with diethylaminopropylamine (DEAPA) in amounts ranging from 10% to 50% of stoichiometric amount. The yield strength of resulting thermosets formed by heat curing at 75°C is found to increase with decreasing amount of hardener. This is attributed to a more densely crosslinked structure resulting from increased tertiary amine-initiated epoxide-epoxide chain reaction and decreased primary and secondary amine-epoxide reaction. Infrared analysis and swelling data are also presented. Styrene oxide diluent is found to have a moderate effect on mechanical properties in the range from 10 to 25 parts per hundred (phr).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180407
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  • 6
    Electronic Resource
    Electronic Resource
    Coagulation of a carboxylated latex with polyethylenimine (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 3319-3327 
    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 coagulation of a carboxylated styrene/butadiene latex, using polyethylenimine (PEI), was investigated using a light transmission technique and microelectrophoresis. Two charge-reversal regions were observed as the polyelectrolyte concentration was increased from 10-4 to 1 wt-%. During each of these regions, the latex was destabilized and then restabilized. The addition of HCI to the PEI solution can eliminate the second coagulation region completely while the first region is hardly affected. The second region was found to be dependent on the degree of protonation of the polyethylenimine and occurred in a pH range where the latex surface charge increases drastically as a function of increasing pH due to the ionization of surface carboxyl groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070181112
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular weight and branching development in vinyl acetate emulsion polymerization (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1247-1259 
    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: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180424
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  • 8
    Electronic Resource
    Electronic Resource
    Measurements on the planar extensional viscosity of bulk polymers: The inflation of a thin, rectangular polymer sheet (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1611-1617 
    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: An experimental study of the inflation of a thin rectangular polymer sheet has been conducted to determine whether this technique can be used to measure the planar extensional viscosity of bulk polymers. Viscosities were determined at various extensional strain rates using an undiluted polyisobutylene of high molecular weight. Measurements were also made on the dynamic shear viscosity using orthogonal geometry and compared with “normalized” values of the planar extensional viscosity assuming equivalency of $\sqrt {\Pi _e} $ the second invariant of the extensional strain rate tensor, and the frequency of rotation ω. Industrial fabrication operations where the planar extensional viscosity is expected to play a role include vacuum forming of large rectangular sheets whose length-to-width ratio is large and in injection molds having a center-gated cavity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180603
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  • 9
    Electronic Resource
    Electronic Resource
    Metallographic study of crack growth in an ABS polymer (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 3497-3500 
    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: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070181129
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  • 10
    Electronic Resource
    Electronic Resource
    Preface (1974)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 8 (1974), S. v 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820080402
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