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  • 1
    Electronic Resource
    Electronic Resource
    History independent recovery behaviour of some polymers (1977)
    Springer
    Rheologica acta 16 (1977), S. 609-619 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Bei weichgemachtem Polyvinylchlorid und chloriertem Polyäthylen beobachtet man Erholungserscheinungen. Diese Erholung wird unter Anwendung von zwei verschiedenen Spannungsvorgeschichten, nämlich gemäß dem Kriech- und dem Spannungsrelaxations-Versuch, gemessen. Die gewonnenen Erholungskurven lassen sich superponieren und ergeben bei der Auftragung gegen logt eine sog. „Master“-Kurve. Es wird ein Modell mit vorgeschichtsunabhängigem Verhalten vorgeschlagen, das auf der Theorie des schwindenden Gedächtnisses viskoelastischer Stoffe basiert. Weiterhin wird das Konzept der Vorgeschichtsäquivalenz (History Equivalence) zur Vereinfachung der Bestimmung des Stoffverhaltens bei vorgegebenen konstitutiven Gleichungen herangezogen. Schließlich wird noch ein Theorem zum Erholungsverhalten mitgeteilt.
    Notes: Summary The experimental results show recovery behaviour of plasticised polyvinyl chloride and chlorinated polyethylene. The recovery was measured following two types of stress history, viz. creep and stress relaxation. The recovery curves could be superimposed and form a master curve when plotted on a logt axis. A model of history independent behaviour is proposed. It is based on the theory of Fading Memory of Viscoelastic Materials. Furthermore the concept of History Equivalence is discussed with the aim of simplifying calculations of material behaviour of known constitutive equations. A theorem on recovery is also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01517005
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  • 2
    Electronic Resource
    Electronic Resource
    The nano-scratch technique as a novel method for measurement of an interphase width (2000)
    Springer
    Journal of materials science 19 (2000), S. 1665-1667 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006726429262
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  • 3
    Electronic Resource
    Electronic Resource
    Yield strength and anelastic limit of amorphous ductile polymers (1986)
    Springer
    Journal of materials science 21 (1986), S. 3231-3236 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure of amorphous polyethylene below its glass transition temperature is described in some detail. The dimensions, shape and statistical mechanics of a polyethylene chain are already well understood. The packing of such molecular chains is less understood and it is considered here in terms of a CH2 pair distribution function. The pair distribution function is derived on the basis of (i) the variation of specific volume with temperature for completely amorphous and ideally crystalline polyethylene, and (ii) randomness of packing of the molecular chains. A scheme for the description of deformation of amorphous polymers is proposed. Points of constriction along the molecular chain are defined in terms of variation of cross-sectional area of the molecular tube. During deformation the points of constriction are convected with the body of the polymeR. However, the deformation of the chain segment between the points of constriction is analysed in terms of kinematics of chain linkages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553361
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  • 4
    Electronic Resource
    Electronic Resource
    Yield strength and anelastic limit of amorphous ductile polymers (1986)
    Springer
    Journal of materials science 21 (1986), S. 3237-3242 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes a molecular model of yield for glassy polymers using polyethylene as the model material. The derived yield strength is simply related to fundamental molecular properties of the material. The mechanism of yield does not rely on any of the classical dislocation concepts. Instead it is shown that the yield strength of an amorphous glassy polymer should be viewed in terms of the integrity of a network of the strongest intermolecular bonds in a relatively weaker matrix. Furthermore it is shown that amorphous polymers behave in an anelastic manner as a result of their microstructure. The magnitude of the anelastic strain limit forσ=(σ y is also derived in terms of molecular quantities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553362
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  • 5
    Electronic Resource
    Electronic Resource
    Time dependent morphologies of immiscible polymer blends (1996)
    Springer
    Journal of materials science 15 (1996), S. 610-612 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00579266
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  • 6
    Electronic Resource
    Electronic Resource
    A study of water absorption characteristics of DGEBA/DDS resin system using near infra-red spectroscopy (1994)
    Springer
    Polymer bulletin 33 (1994), S. 465-470 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Water absorption and desorption of the diglycidyl ether of bisphenol A (DGEBA)/4,4′-diaminodiphenyl sulfone (DDS) resin systems, cured isothermally at three different temperatures (160, 180 and 220°C), were monitored at 80°C, as a function of soaking and drying times. New near infra-red spectroscopic (NIR) technique as well as the conventional gravimetric method were used. The data from two different techniques were reasonably identical showing that the new NIR technique is valid. The resin systems cured at higher temperature absorbed more water. The degree of structural packing of the network systems has been estimated from the observations in water absorption characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293492
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  • 7
    Electronic Resource
    Electronic Resource
    Ionenleitung in Polymeren (1974)
    Springer
    Colloid & polymer science 252 (1974), S. 269-269 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01638116
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropy of viscoelastic transitions in oriented polyethylenes (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1083-1091 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements have been made of the anisotropy of viscoelastic behavior in cold-drawn low-density and high-density polyethylene sheets. In the low-density polymer the β transition was shown to be highly anisotropic, maximum losses corresponding to shear on planes containing the axis of drawing and on planes perpendicular to this axis. In high-density polyethylene the α transition shows anisotropy.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060604
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  • 9
    Electronic Resource
    Electronic Resource
    Tearing resistance of multi-layer plastic films (1993)
    Springer
    International journal of fracture 68 (1993), S. 141-150 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tear resistance of multi-layered plastic films can be generally predicted from the tear resistance of individual layers by an additive rule. The most notable exception from this additive rule is the case of multi-layered films containing a polyethylene layer. The reason for this specific case is explained by the constraint on the plastic yield zone of polyethylene, which causes a dramatic drop in the tear resistance of the multi-layered film. An extensive plastic zone is generated during the tear fracture of a single layer polyethylene film. This yield zone does not appear when polyethylene is laminated with other polymer films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032464
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  • 10
    Electronic Resource
    Electronic Resource
    β Relaxations in polyethylenes and their anisotropy (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1817-1833 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements have been made of the anisotropy of viscoelastic behavior in specially oriented sheets of low-density polyethylene. The results for the cold-drawn sheets show a β relaxation process of very characteristic anisotropy. The annealed sheets show two relaxations in this region of temperature. The lower relaxation (about -10°C) is identified as an interlamellar shear process. The higher relaxation (about 70°C) has a very similar anisotropy to the β relaxation in cold-drawn samples. Isotropic sheets of low-density polyethylene have been also investigated. Two β relaxations are found in these materials.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160061101
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