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  • Articles: DFG German National Licenses  (4)
  • Polymer and Materials Science  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Permeability of synthetic polypeptide membranes. I. Poly-D,L-leucine-co-D,L-methionine (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 647-655 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: D,L-Leucine-NCA and D,L-methionine-NCA were copolymerized in varying mole fractions by using primary base initiation. The methionine segments were oxidized to both sulfoxide and sulfone functions by using peroxide oxidation. The compositions of the resulting polymers were established with the aid of 60 MHz NMR. The transport properties of aqueous solutes through membranes formed from these polymers were studied by means of a diffusive dialysis measurement. The transport of NaCl, urea, creatinine, uric acid, and bacitracin were found to be strongly dependent on the degree of hydration of the polymers. The relative rates of transport of these solutes were affected by interaction with the polymers, when the degree of hydration was not excessive. The degree of hydration was a function of the extent of methionine oxidation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100405
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The relationship between polymer elastic properties and the ability to impart improved wrinkle recovery to cotton fabric (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 341-349 
    Details
    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 wrinkle recovery of polymer-coated cotton printcloth was generally found to correlate qualitatively with the elastic behavior of the polymer film. Of the several tensile parameters that can describe elasticity, immediate strain and work recoveries and stress decay were found to be the most sensitive indicators of the polymers' performance on the fabric. Delayed recovery, ultimate elongation, and permanent set were found to be important but were less sensitive parameters; while tensile strength and initial modulus appeared to be unrelated. A model is described whereby the polymer provides additional recovery forces when properly coupled to the fabric. High values of stress decay and permanent set diminish the effectiveness of these forces, while high values of immediate, work, and delayed recovery indicate that large portions of the distorting forces are available for recovery.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070150208
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The relationship between molecular parameters and polymer distribution and the ability of a polymer to improve the resilience of cotton fabrics (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 1187-1196 
    Details
    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: Elastic properties are found to be critical parameters for polymers which improve the wrinkle resistance of cotton fabric. Those molecular factors which results in optimum recovery of a polymer film from distortion (i.e., stretching) are shown to be directly related to the ability to improve fabric wrinkle recovery. Further, those molecular factors which inhibit the tendency of a polymer to form ordered structures allow the inherent flexibility of the polymer to be utilized in storing energy of distortion. This energy is then available, if the polymer is properly distributed on the fabric, to help overcome the fabric's frictional resistance to recovery. The most advantageous distribution of polymer is one in which interfiber and interyarn elastic bridges are formed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170415
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Porosity and pore size determination in polysulfone hollow fibers (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 1883-1900 
    Details
    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: Average pore sizes and effective porosity of microporous polysulfone hollow fibers were determined by the gas permeability method. Surface structure and porosity were determined by scanning electron microscopy. The values of effective porosity ε/q2 (porosity/tortuosity factor) are approximately one order of magnitude lower than those reported previously for flat sheet porous membrane. These lower values are a direct outcome of a higher polymer concentration in the spinning dope. Correlations between the wall void volume, equivalent pore size, and hydraulic permeabilities of the hollow fibers have been determined. Rather low values of ε/q2 have been calculated compared to those of the void volume; these effective porosity values indicate either a very high tortuosity factor or a large number of “dead end” pores. Exposure of the fibers to elevated temperature (110°C) for a short period of time drastically reduces the surface pore size and narrows the pore size distributions, whereas overall fiber dimensions are reduced only by 1%, and 85% of the fiber's hydraulic permeability is retained. The scanning electron microscopy study reveals the formation of a relatively dense skin in some spun fibers. For such “skinned” fibers, kinetic (permeability) evaluation of static structure such as mean pore size is not realistic and is further generalized to the term “equivalent pore size.”
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210715
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    Paper (German National Licenses)
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