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  • 1
    Electronic Resource
    Electronic Resource
    Development of the vibrational time-delay technique and the study of stress/strain coupled diffusion in polymers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 112-116 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique has been developed to measure the linear mass density of fibers and ribbons, and adapted to the study of stress/strain coupled diffusion in polymeric materials. The technique overcomes the limitations of sensitivity and range, typical of traditional diffusion measurement techniques, and can be used for a wide range of fiber densities. It is also possible to monitor stress or strain within the fiber while measuring the change in mass, without requiring the fiber to be at equilibrium or interrupting the experiment. Estimates of material property changes, as exemplified by tensile modulus changes, can also be made during the course of the experiment. The mass per unit length, at any given time, of polymer fibers or ribbons under known stresses and strains can be determined by this technique. From this it is possible to estimate the gain or loss in weight in the sample due to permeants diffusion. Some preliminary result of constant strain and constant stress experiments on ribbons of polycarbonate, polyimide, and precured epoxy, and KevlarR monofilaments, are discussed and the scope and resolution of the apparatus are indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139551
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ellipses and ellipsis (1990)
    [s.l.] : Nature Publishing Group
    Nature 348 (1990), S. 683-684 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Klaczko and Bitner-Mathe in their Scientific Correspondence1 fit ellipses to wing outlines of Drosophila. The fit is impressive and they suggest that ellipse shape can be used to quantify wing shape. But the same ellipse can exactly fit outlines of very different shapes (Fig. 1). Such ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/348683b0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enthalpy relaxation in polymethyl(α-n-alkyl)acrylates: Effect of length of alkyl chain (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 583-593 
    Details
    ISSN: 0887-6266
    Keywords: enthalpy relaxation ; differential scanning calorimetry ; peak-shift method ; polymethyl(α-n-alkyl)acrylates ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In this work, we have investigated by DSC the structural relaxation of amorphous polymethyl(α-n-alkyl)acrylates in which it is possible to change the length of the alkyl chain. We have evaluated the Narayanaswamy parameter, x, which controls the relative contribution of temperature and of structure to the relaxation time, the apparent activation energy, Δh*, and the nonexponentiality parameter, β, of the stretched exponential response function. The results suggest that x increases while Δh* decreases and β remains constant as the length of the side chain increases. This allows us to comment on the effect of chemical modification on the relaxation kinetics. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 583-593, 1998
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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