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  • 1
    Electronic Resource
    Electronic Resource
    Deformation of polyoxymethylene by rolling (1971)
    Springer
    Journal of materials science 6 (1971), S. 509-530 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The deformation due to rolling of polyoxymethylene (POM) was investigated by using wide and small angle X-ray techniques and electron microscopy. Tensile tests of rolled POM indicate that the yield stress increases along the roll direction. This is accompanied by a decrease in the yield stress perpendicular to the roll direction. Wide angle X-ray data from uniaxially rolled POM, obtained by means of pole figures, indicate that molecular chains tilt preferentially at approximately 30° to the roll direction at low rolling deformation, and align in the roll direction when the sample is rolled to its fullest extent. A lamellar tilt of of about 30° is also observed. Thus, the chains must tilt within the lamellae. When samples are fully rolled, small angle patterns indicate at least partial breakup of lamellae. Biaxial rolling produces no such breakup, but a uniform tilting of lamellae through the entire range of deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550306
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Deformation of polyethylene oxide, nylon-11 and polyethylene terephthalate by rolling (1971)
    Springer
    Journal of materials science 6 (1971), S. 531-536 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tensile properties and structural changes in rolled polymers were studied for several systems, including: polyethylene oxide (PEO), nylon-11 and polyethylene terephthalate (PET). All showed tensile properties typical for rolled systems, i.e. increase in strength along the roll direction, and a corresponding decrease perpendicular to the roll direction. Wide angle X-ray diffraction showed that for PEO and PET the chains were aligned parallel to the roll direction. Molecular chains for nylon-11 are preferentially tilted from 20 to 25° to the roll direction at low deformation. This tilt decreased with increased rolling and the chains were aligned in the roll direction at high deformation. Nylon-11 and PET showed four-point patterns typical of such systems in the small angle X-ray region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550307
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology of quenched polypropylene (1968)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 8 (1968), S. 202-209 
    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 morphology of the quenched form of polypropylene was investigated. Thin films of the quenched form consist of small ball-like structures which we suggest are defective hexagonal crystals. In thicker films they aggregate to form spherulites with no observable fine structure. Quenching of thin films of molten polypropylene to a temperature below 0°C results in the formation of numerous, isolated monoclinic spherulites with a better defined morphology than the smectic spherulites obtained by quenching above 0°C. This result suggests that the films (quenched below 0°C) were quenched to the glass and subsequently crystallized to the monoclinic form upon heating to room temperature.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760080305
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  • 4
    Electronic Resource
    Electronic Resource
    Deformation and aging of quenched polypropylene (1968)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 8 (1968), S. 210-215 
    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 physical properties, i. e., yield stress and stress-strain curve of the quenched (“smectic”) form of polypropylene have been shown to be time dependent at room temperature. The yield stress increases linearly with the logarithm of film age. No changes in the x-ray diffraction pattern, infra-red spectrum, electron diffraction pattern or morphology have been observed corresponding to this change in physical properties. A molecular mechanism is proposed which will explain this again process. Spherulites of the quenched form have been found to deform affinely when drawn. In contrast to this, slow cooled films show complete destruction of internal spherulite (lamellar) order, indicating a complex mechanism of deformation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760080306
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Processing-morphology-property studies of poly(vinyl chloride) (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 371-381 
    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: Recent morphological studies of plasticized and unplasticified poly(vinyl chloride) (PVC) are reviewed. Suspension polymerized PVC contains particles in a number of different size ranges 100-200Å, 1000-5000Å, 1μ and larger. The larger size particles are broken down during plasticization but both the 100Å and the 1000Å suspension particles retain their identity. The visibility, and presumably, coalescence of these particles is a function of the processing conditions. In particular, the size of the 100Å particle increases with plasticizer content and is most distinct as characterized both by small angle x-ray scattering and electron microscopy for milling temperatures in the 160-170°C. range. Consideration is given to the effect of these particles, their structure, and interrelationship on the rheological properties of the resins.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760140512
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    Paper (German National Licenses)
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