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  • Articles  (12)
  • 1985-1989  (12)
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  • Articles  (12)
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  • 1
    facet.materialart.
    Unknown
    The concentration dependence of the diffusion and permeability in a homogeneous membrane (1985)
    Springer
    Details
    Publication Date: 1985-01-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 2
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    The concentration dependence of the diffusion and permeability in a homogeneous membrane (1985)
    Springer
    Details
    Publication Date: 1985-01-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Drawing and extrusion of semi-crystalline polymers (1987)
    Springer
    Details
    Publication Date: 1987-05-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    The concentration dependence of the diffusion and permeability in a homogeneous membrane (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 42-50 
    Details
    ISSN: 1435-1536
    Keywords: Chemical potential ; uniform membrane ; concentration dependent sorption ; concentration dependent diffusivity ; sorption transient ; permeation transient
    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 In a linear dependence of the sorption coefficient S on the equivalent pressure of the penetrant the differences between the Fickian and chemical potential formulation of the diffusion current are very soon larger than 20%, the assumed and tolerated error limit of the experiment. It turns out that the zero concentration diffusion coefficientD o determined from the sorption or permeation transient on the basis of the chemical potential basis is larger than that determined on the basis of Fick's law. The exponential concentration dependence as measured byγ, however, is very little affected up toγc o=4. The steady state current of the permeation mulitplied by the time-lag yields the concentration dependent sorption practically independent of the formulation used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411247
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  • 5
    Electronic Resource
    Electronic Resource
    The concentration dependence of the diffusion and permeability in a homogeneous membrane (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 35-41 
    Details
    ISSN: 1435-1536
    Keywords: Chemical potential ; uniform membrane ; concentration depend sorption ; concentration depend diffusivity ; sorption transient ; permeation transient
    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 For the sorption and diffusion coefficient dependence on the concentration of the penetrant the transport properties of a homogeneous medium are calculated. The diffusion current is assumed to be proportional to the negative gradient of the chemical potential. This is in contrast with the first Fick's law that assumes this current to be proportional to the negative gradient of the concentration of the penetrant. The difference between the two cases depends on the concentration dependence of the sorption coefficient. In a homogeneous membrane the chemical potential formulation leads to an equation which is very similar to the Fickian expression. The apparent diffusion coefficient, however, depends not onlly on the transport resistance but also on the deviation of the sorption coefficient from constancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411246
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  • 6
    Electronic Resource
    Electronic Resource
    Drawing and extrusion of semi-crystalline polymers (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 357-382 
    Details
    ISSN: 1435-1536
    Keywords: Drawing ; extrusion ; semi-crystalline polymers ; transformation of lamellar into microfibrillar structure ; long period ; draw ratio ; draw rate ; mechanical propertities ; transport of small molecules
    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 This review treats mainly the initial transformation of the starting unoriented lamellar material into the final oriented microfibrillar structure and its drawing. If the starting material has partially oriented shish-kebab structure the drawing is a combination of transformation of lamellae into the microfibrils and the drawing of microfibrils. The review article is based on the literature from the last ten years and relys heavily on recent reviewing [1–3]. Older articles are only included if they have contributed to the basic ideas and experiments of drawing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412215
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  • 7
    Electronic Resource
    Electronic Resource
    Monoplanar small angle neutron scattering by semicrystalline polymer solids containing homogeneously distributed otherwise identical deuterated polymer molecules (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1623-1633 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The first “linear” range of inverse reduced scattering intensity of N stems in monodisperse clusters versus q2 with the initial slope Rcc2/2 is followed by a second nearly 20% steeper and 10 times wider quasi-linear range. The difference slightly decreases with polydispersity of the clusters. This case will not be discussed here. One may deduce from the second range the fictive number N of stems and gyration radius Rcc which differ less than 10% from the true values obtained from the first “linear” range. But the fine structure of the equal monoplanar clusters on the scattering molecule may change enormously with interior gaps while keeping constant the scattering intensity in the interesting region, N and Rcc of the cluster. In the sensitive range of the first two quasi-linear ranges all these 3 quantities are so little affected by the changes of fine structure that small angle neutron scattering (SANS) yielding N and Rcc does not permit any statement on these changes. The calculations of SANS results with some equidistant gaps which retain N and Rcc yield the same intensity distribution in the interesting range. This follows from the fact that N commands the intensity while Rcc rules not only the first but also the second quasi-linear range. The perfect merging of the first with the second quasi-linear ranges in the SANS of polyethylene demands a special arrangement of a single gap separating one single stem from the bulk of the active stems in the cluster.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021900714
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  • 8
    Electronic Resource
    Electronic Resource
    Failure of plastics, by Witold Brostow and Roger Corneliussen, Hanser Macmillan, New York and West Germany, 1986, 486 pp. Price: $119.50 (1987)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 25 (1987), S. 266-266 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1987.140250609
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  • 9
    Electronic Resource
    Electronic Resource
    Aging phenomena in isotactic polypropylene drawn at different temperatures (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1897-1906 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fibers of isotactic polypropylene drawn at different temperatures show aging phenomena after drawing. In particular a modulus stiffening is observed at room temperature where the modulus increases with the aging time. In the same time scale the birefringence is constant, while drastic effects on the transport properties are observed. The aging phenomenon can be explained in terms of two mechanisms: a secondary crystallization and/or a densification of the amorphous component.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260907
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanical and transport properties of highly drawn isotactic polypropylene (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1009-1019 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Quenched films of isotactic polypropylene were drawn at 110°C up to draw ratio λ = 18. The axial elastic modulus was measured as function of λ up to the highest achieved λ. The sorption and diffusion of CH2Cl2 at 25°C in the undrawn and drawn samples were studied. Exclusively transparent samples were used for the measurement of the density and transport properties. This reduces the maximum usable draw ratio to 15. The drawing process is inhomogeneous with neck propagation. In the neck the draw ratio increases by about 6. As a consequence of the increasing fraction of taut tie molecules the axial elastic modulus increases faster than the draw ratio. The transport parameters D, S, and λ indicate that the original lamellar morphology is completely transformed into the microfibrillar structure.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240506
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