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  • 1
    Electronic Resource
    Electronic Resource
    Melt transformation coextrusion. I. (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1004-1009 
    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: Using the Melt Transformation Coextrusion process it is possible to enhance the mechanical and thermal properties of polymeric extrudates directly from the melt and maintain continuous production rates. This adaption of melt transformation extrusion has significantly enhanced line speed compared to the precursor process. The required operating pressures in both processes are low enough to allow for the usage of commercial plasticating extruders as the polymer melt sources. Molecular orientation necessary to produce property enhancement is induced in the converging section of specially designed dies and retained by the core layer of the extrudate by imposing a steep temperature gradient in the land section of the die. Mechanical properties (i.e. tensile strength and modulus) and melting point elevation observed for the polypropylene core/polyethylene skin extrudates were functions of extrusion pressure. The highest values of these properties noted were: tensile modulus, 9.37 × 105 psi; tensile strength, 2.10 × 104 psi; and melting point elevation in excess of 10 K. The levels of property enhancement seem to be bound in their lower limit by a metastable liquid crystalline form. The upper theoretical limit of property enhancement should correspond to a fully extended chain morphology.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760291506
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  • 2
    Electronic Resource
    Electronic Resource
    Melt transformation coextrusion. II: Flow analysis (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1010-1017 
    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: Melt Transformation Coextrusion for power law fluids was analyzed with particular attention being paid to the influence of the die's geometrical shape on flow patterns, and to skin layer effect on the velocity profile and shear stress at the interface between layers in a three-layered system. Volumetric flow rate expressions were also generated for the aforementioned system, and stream and potential functions were derived for a free boundary converging film geometry. Newtonian as well as non-Newtonian fluids were considered for this analysis in which the streamline shape changes their convergence downstream into the land section. Also, a finite element solution technique was utilized to reveal shear stress profiles that arise from the flow of high density polyethylene at 200°C in a converging fixed boundary geometry.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760291507
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  • 3
    Electronic Resource
    Electronic Resource
    Novel micaceous reinforcing fillers with fire and smoke retarding qualities (1995)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 1 (1995), S. 36-40 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper describes Miconite (hydrated potassium, magnesium aluminosilicate) and explains the processability and properties of Miconite-filled propylene homopolymer. With particles averaging 2.5 and 44 microns, this study found the compound processability, as given by its melt index, unchanged for filler loadings lower than 35%. Tensile strength of the original polymer doubled with the addition of the first 10% of Miconite and stayed constant for all loadings tested up to 60%. Tensile modulus increased linearly with filler loading. Elongation and impact behavior showed negligible decreases for loadings lower than 30%. Deterioration by ultraviolet and/or heat-aging was negative. Miconite provides matrix materials with fire and smoke retarding qualities.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730010110
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