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  • 1
    Electronic Resource
    Electronic Resource
    Rheological investigation of aqueous solutions of poly(vinyl alcohol) during aging III. Effect of the thermal prehistory of the polymer on the process of aging of concentrated solutions (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 903-907 
    Details
    ISSN: 1435-1536
    Keywords: Polyvinylalcohol ; aging ; preheating of polymer ; rheological properties ; concentratedsolutions
    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 paper deals with aging of concentrated poly(vinyl alcohol) solutions prepared from polymer samples which, prior to dissolution, were heated at various temperatures in an aqueous suspension or in the powder state. The effect of preheating is discussed on the basis of changes in viscosity and normal stress difference, measured during aging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421819
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  • 2
    Electronic Resource
    Electronic Resource
    A rheological investigation of aqueous solutions of poly (vinyl alcohol) during aging. Part IV: Repeated aging of concentrated solutions (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 1066-1068 
    Details
    ISSN: 1435-1536
    Keywords: Poly (vinyl alcohol) ; concentrated solutions ; repeated aging ; rheological properties
    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 Aging of aqueous solutions of poly (vinyl alcohol) obtained by melting of gels, formed in the aging process from solutions prepared by the dissolution of the polymer in hot water, was investigated using non-Newtonian viscometry and normal stress measurement. It was shown that, if the gels undergo melting at the same temperature at which the original solutions were prepared, aging of such solutions proceeds in the same way as in the case of the original solutions. If melting occurred due to heating at lower temperature, the resulting solutions aged more quickly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652869
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  • 3
    Electronic Resource
    Electronic Resource
    Properties of a drag reducing micelle system (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 542-547 
    Details
    ISSN: 1435-1536
    Keywords: Surfactant ; micelle structure ; drag reduction ; rheological properties
    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 Rheological properties of a drag-reducing surfactant were investigated with the intention to find out the influence of shear rate and the duration of shear straining on the Shear Induced Structure. The ability of the surfactant to restore the broken drag-reducing network after the decrease of shear stress is well known. This property of reversible change caused by high shear at different flow conditions was compared to a more intensive mechanical straining by means of ultrasound. Observations using electronmicroscope and spectrometer are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653219
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