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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 260 (1982), S. 1017-1022 
    ISSN: 1435-1536
    Keywords: Cold drawing ; free volume ; annealing ; Polyvinylchloride
    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 Cold drawing of PVC-films at room temperature depends on thermal pretreatment. Yield stress, difference between yield and draw stress and neck temperature increase, when the samples have been annealed not far below glass transition temperature and subsequently quenched; they decrease by annealing aboveT g and quenching down to room temperature. These changes of variables characterizing the cold drawing process can be interpreted morphologically by an increase or decrease of free volume in the noncrystalline regions which favour neck formation or render it more difficult respectively.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 259 (1981), S. 911-916 
    ISSN: 1435-1536
    Keywords: Dichroism ; fluorescent molecules ; orientation factor ; Polyvinylchloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Eine Reihe von Fluoreszenzmolekiilen unterschiedlicher Gestalt werden in PVC-Folien eingebettet. Die Folien werden bei 55 °C und 85 °C verstreckt. Mit Hilfe von UV-Dichroismus und Doppelbrechung werden Orientierungsmittelwerte für die Fluoreszenzmolekiile bzw. Polymersegmente bestimmt. Die Abhängigkeit der Orientierungsmittelwerte von Verstreckparametern und dem speziellen Fluoreszenzstoff wird diskutiert. Lange, stäbchenförmige Moleküle weisen höhere Orientierungswerte auf als kleinere. Die Summe der Absorptionskoeffizieten ist offenbar abhängig von der Temperatur des Verstreckungsprozesses.
    Notes: Summary Various fluorescent molecules of different shapes are imbedded in PVC-films. The films are drawn at 55 °C and 85 °C. The orientation factor of the fluorescent molecules and of the polymer segments are measured using UV-dichroism and birefringence respectively. The dependence of the orientation factors on drawing parameters and fluorescent species is discussed. Long rodlike fluorescent molecules exhibit gerater orientation factors than smaller ones. The sum of absorption coefficients turns out to depend on temperature of drawing process.
    Type of Medium: Electronic Resource
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