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  • Articles  (2)
  • Branchedpolyethylene  (1)
  • electron microscopy  (1)
  • 1985-1989  (2)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
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  • Articles  (2)
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Keywords
Publisher
Years
  • 1985-1989  (2)
Year
Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
  • Chemistry and Pharmacology  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Equilibrium and non-equilibrium melting of branched polyethylene relating to defect incorporation within crystals (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 239-245 
    Details
    ISSN: 1435-1536
    Keywords: Branchedpolyethylene ; equilibriummelting point ; enthalpy offusion ; surface free energy ; kinks ; chain defects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract New equilibrium melting point data, for polyethylene containing chain defects, are tested in the light of random copolymer predictions. A simplified expression for the melting point depression of random copolymers containing small amounts of non-crystallizable units is derived. Non-equilibrium melting data for rapidly quenched polyethylene samples are also reported. The fusion enthalpyΔH∘(X), and the surface free energyσ e for crystals containing defects are evaluated using crystallinity, equilibrium meltingtemperatures and X-ray long period data. It is shown that increasing defect penetration within crystals induces a decrease ofΔH∘(X) withX in accordance with theoretical predictions. Finallyσ e is, similarly, shown to decrease with increasing number of chain defects attached to the crystal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412713
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conductive polyethylene-carbon black composites by elongational-flow injection molding Part 3. Study of the structure and morphology (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 409-413 
    Details
    ISSN: 1435-1536
    Keywords: Polyethylene-carbon black composities ; injection-molding ; electron microscopy ; small angle x-rax diffraction ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The morphology and structure of high molecular weight linear polyethylene (M w 450000) filled with carbon black and processed using molds that introduce an elongational flow component during injection molding has been examined using electron microscopy and x-ray diffraction techniques. The study of fracture surfaces reveals the display of shish-kebabs oriented along the injection direction with segregated longitudinal channels of carbon black particles. Molecular and lamellar changes in orientation are, furthermore, studied across the thickness of the moldings. It is shown that addition of carbon black particles to injection-molded polyethylene induces significant changes in lamellar orientation. Thus, while lamellar overgrowth proceeds perpendicular to the fiber axes within carbon free channels, lamellae grow randomly within carbon-enriched regions where flow is less pronounced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410185
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    Paper (German National Licenses)
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