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  • 1995-1999  (2)
  • 1985-1989
  • 1930-1934
  • 1996  (2)
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  • 1995-1999  (2)
  • 1985-1989
  • 1930-1934
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  • 1
    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 sandwich structure of injection-moulded polypropylene parts with and without weld lines has been investigated using optical microscopy. X-ray scattering, and differential scanning calorimetry. It was found that the skin-layer thickness is strongly dependent on whether the mould is injected through one gate or through two gates. Samples containing a weld line show a much lower skin-layer thickness than samples without a weld line. This difference, however, depends strongly on the molecular weight of the polypropylene. The skin-layer thickness also varies along the flow path and decreases with increasing mould temperature. While most of the polypropylene crystallizes in the crystallographic α-modification, in the textured skin layer, some β-modification occurs. The β-crystallinity depends on the molecular weight but disappears in the weld line. X-ray investigations exhibited a bimodal crystal orientation in the skin layer, one with thec-axis oriented parallel to the flow direction, the second one with thea *-axis oriented parallel to the flow direction. The core exhibited only a weakc-axis orientation. In the skin, the metastable α1-modification was found.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 1891-1896 
    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 crystallization behavior of an isotactic polypropylene/linear low-density polyethylene blend (PP/LLDPE) that is modified with styrene-ethylene/butylene-styrene triblock copolymer (SEBS) has been investigated using differential thermoanalysis and polarization microscopy. SEBS, which enhances the impact resistance of the blend, has an effect on both the nucleation and crystallization kinetics of the polypropylene component. Nucleation half times, nucleation densities, and spherulite growth rates are influenced by the presence of the copolymer. It is found that SEBS, depending on its concentration in the blend, increases the adhesion between matrix and PE domains and acts simultaneously as the matrix reinforcer. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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