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  • Wiley-Blackwell  (3)
  • 1985-1989  (3)
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  • Wiley-Blackwell  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Practical characterization of the structure of crystalline polymer moldings (1988)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 852-856 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 and flow gradients present during thick polymer molding processes can produce layered structures through the thickness which vary in crystallinity, orientation, and axiality. Such structural complexity is difficult, expensive, and time consuming to characterize and presently impossible to predict. In order to overcome these problems emphasis in our laboratory has been directed toward the development of rapid, nondestructive techniques for the quantitative characterization of the structure of thick polymer samples. This includes the characterization of the average structure, the surface structure, and the internal layer structure. The present paper discusses some of these techniques and illustrates their application.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760281305
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Prediction of axial and off-axis yield behavior of lsotactic polypropylene film from structural state parameters (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 875-887 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Since only minor structural rearrangements occur prior to yielding, the axial and off-axis yield stress of a polymer sample is expected to relate to the initial structural state of the material. Samples of uniaxially oriented isotactic polypropylene films with known structural state parameters have been deformed under a uniaxial tensile stress at deformation rates of 20 percent and 100 percent per minute over an angular range from 0 to 90 degrees to the fabrication direction. The axial yield stress data was found to correlate with the initial noncrystalline orientation state of the undeformed sample. The axial and offaxis yield stress data was fit to the Hill equation derived for the application of a uniaxial tensile stress. The experimentally determined coefficients from the best fit of the yield stress data to the Hill equation were related to the measured structural state parameters. These correlations allow prediction of the yield stress of an anisotropic film at any angle to the film symmetry axis from knowledge of the measured structural state parameters alone.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760251404
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polymer structure: The key to process-property control (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 864-874 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 key to process-property control is a knowledge of the structural state of the product desired and the availability of methods to economically characterize the structural states produced. The present paper demonstrates that these goals are attainable. Examples illustrate both that the equivalent state concept leads directly to the use of structural state functions as the pivotal criteria around which property and process data can be organized, and that this approach is appropriate to many fabrication processes, including films, fibers, and moldings. Further, the development of process-structure-property correlations is seen to lead to new processes and the development of structures having unique properties.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760251403
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    Paper (German National Licenses)
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