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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Dilatometric study of deformation induced volume increase and recovery in rigid PVC (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 913-920 
    Details
    ISSN: 1435-1536
    Keywords: Dilatometry ; volume recovery ; physical aging ; shear deformation ; torsion ; rejuvenation
    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 A new torsion dilatometer is presented which allows simultaneous measurement of shear deformation, twisting moment, volume variation and axial deformation (or normal force). It is intended to be utilized principally for studies of volume changes during torsion and recovery behavior of amorphous polymers in their glassy state. Preliminary results on unplasticized PVC are presented which show rather complex volume changes. With increasing torsional strain, a volume decrease at low strains was found, followed by a volume increase for higher strains. In the latter case, after coming back to zero torsion angle, shear induced relative volume increase and subsequent recovery were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410846
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of deformation on the physical ageing of polycarbonate (1985)
    Springer
    Polymer bulletin 14 (1985), S. 53-60 
    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 Physical aging behavior of polycarbonate samples has been studied by dynamic mechanical torsion tests near ambient temperature in the range of 0.01 to 100 rad/s. Aging effects have been measured either after heating above Tg and quenching, or after cold drawing at ambient temperature, or after a combination of both. On the quenched samples our results are consistent with findings of S{uptruik} (1) obtained by creep tests, i.e. an aging rate, μ,, of about 1. On the other hand, on the cold drawn samples μ was found to be about 2.3 when determined from storage modulus data, and about 1.5 from loss modulus, indicating an acceleration effect on the molecular mobility in PC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254915
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of deformation on physical aging of polycarbonate (1986)
    Springer
    Polymer bulletin 16 (1986), S. 381-387 
    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 Volume recovery of polycarbonate samples has been investigated by dilatometric and density measurements near ambient temperature. The volume changes with time have been measured either after heating above Tg and quenching, or after cold drawing at ambient temperature. Cold drawing drastically increases the volume recovery rate of polycarbonate, as compared with the rate observed after quenching. This is quite similar to the behavior previously reported on physical aging measured by dynamic mechanical tests (1). The observed decrease of specific volume after cold drawing can be explained by a densification effect due to molecular orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255013
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental determination of the evolution of internal stresses in a composite material: Case of a circular bilayered laminate glass-resin (1988)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 9 (1988), S. 125-130 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A nondestructive method is proposed to analyze the internal stresses of a circular bilayered laminate glassresin. It is based on the measurement by optical interferometry of small deformations of the laminate under the influence of temperature, time, or applied mechanical stresses of known value. For example, the stress induced by the curing of the thermosetting resin layer is determined and the postcuring relaxation of the stress is measured. Other possibilities or improvements of the method are indicated: The determination of the Young's modulus of the thermosetting resin as a function of time, the determination of the work-hardening rate, and the determination of the ultimate properties of the laminate are just a few of them.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750090205
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    Paper (German National Licenses)
    Fulltext
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