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  • Polymer and Materials Science  (7)
  • 2010-2014
  • 1985-1989  (3)
  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    A constitutive equation for creep in polymer concretes and their resin binders (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 353-364 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: We present here a method for superposing creep measurements on polymer concrete (PC), taken at different temperatures, imposed stresses, and resin contents, onto master curves, which describe the respective responses of various PC systems and their resin binders, to compressive, tensile, and flexural loads. This treatment is extended to systems reinforced with chopped glass fiber and montmorillonite (MMT). The general applicability of this superposition is tested with creep measurements by other investigators under tensile, compressive, and flexural loads. The results make it possible to predict the long-term creep behavior of unfilled as well as reinforced glassy polymer systems at different temperatures and load conditions from limited, short-term data. Success of the multiple superposition suggests a generalized constitutive equation, which describes the creep compliance of these systems as a product of separable functions of each parameter in the form of shift factors for temperature (αT), stress (ασ), resin content (αυ), fiber reinforcement (αF), and MMT reinforcement (αM): J(PC) = JrαTασαυαFαMtm, where Jr is an appropriately chosen reference creep compliance. The time exponent m does not depend on the chemical nature of the polymer matrix.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360208
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  • 2
    Electronic Resource
    Electronic Resource
    Rheological behavior of thermotropic flexible main-chain polyesters based on 4,4′-dioxy-2,2′-dimethyl azoxybenzene mesogens. I. Oscillatory shear behavior (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 27-38 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The rheological properties of fractionated thermotropic nematic polyesters 4,4′-dioxy-2,2′-dimethyl azoxybenzenenonanediyl (n = 7) (AZA-9) and dodecanediyl (n = 10) (DDA-9) have been determined under oscillatory shear in the nematic and isotropic phase. A markedly more pronounced shear thinning characterizes the polydisperse DDA-9 polymer as compared to the fractionated polymer in the nematic state. This difference becomes less pronounced in the isotropic phase. In all cases, the elastic compliance J′ in the isotropic state is much lower than in the nematic state. The values of relaxation time λ, although lower in the isotropic state, are not very different in the nematic state. The loss tangent tan δ is significantly higher in the isotropic phase for lower molecular weights. For molecular weights of 13,000 and above, this difference becomes smaller and shifts to lower angular frequencies. For AZA-9 and DDA-9, ηω*→0 the limit of the dynamic viscosity can be represented by η* = Mna with a value of α similar for both phases and approximately equal to 4.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.180240104
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  • 3
    Electronic Resource
    Electronic Resource
    Enthalpy relaxation of filled copolymers (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 2315-2320 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Excess enthalpy following annealing at various periods of time at Tg -10°C was measured by differential scanning calorimetry of electrophotographic toners, copolymers of styrene and butyl methacrylate containing carbon black. An approximate equilibrium enthalpy relaxation after annealing the pure copolymers for one month was 3.30 kJ/kg for a copolymer with 66.5% styrene and 2.72 kJ/kg for a copolymer containing 49.8% styrene. The rate of enthalpy relaxation was reduced by increasing the styrene content of the pure copolymer. The incorporation of a carbon black with high surface area reduces the rate of enthalpy relaxation, increasing in effectiveness with butyl methacrylate concentration.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300604
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  • 4
    Electronic Resource
    Electronic Resource
    Study on the curing between shellac and melamine resin by dielectric measurements (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 127 (1984), S. 211-214 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Härtungsreaktion zwischen Schellack und Melaminharz wurde in der löslichen Stufe durch Messen des Streufaktors (tan δ) bei 100 kHz verfolgt. Es wurde gefunden, daß die zeitabhängige Messung des Streufaktors gut zur Bestimmung der Härtungszeit der Schellack-Melaminharz-Mischung geeignet ist.
    Notes: The curing between shellac and melamine resin was investigated in the solution stage by the measurement of dissipation factor (tan δ) at 100 kHz. It was found that the measurement of dissipation factor with time can be conveniently used for the determination of cure-time of shellac-melamine resin blends.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051270118
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  • 5
    Electronic Resource
    Electronic Resource
    Study on the curing of shellac with epoxy resins by dielectric measurements (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 126 (1984), S. 145-152 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Härtung von Schellack mit Epoxidharzen wurde in Lösung durch zeitabhängige Messung des Streufaktors (tan δ) und der Leitfähigkeit bei 100 kHz verfolgt. Die zeitliche Änderung der Durchschlagfestigkeit und der spezifischen Viskosität wurden ebenfalls untersucht. Diese Untersuchungen ergaben, daß der größte Teil der Härtung von Schellack mit Epoxidharzen bei niederen Temperaturen innerhalb von sechs Tagen nach der Mischung der beiden Komponenten stattfindet. Es wurde eine merkliche Verbesserung der Durchschlagfestigkeit bei den Mischungen beobachtet. Die Ergebnisse lassen den Schluß zu, daß die zeitabhängige Messung der Durchschlagfestigkeit vorteilhaft zur Verfolgung des Härtungsverlaufs bei Schellack/Epoxidharz-Mischungen eingesetzt werden kann.
    Notes: The curing of shellac with epoxy resins was investigated in the solution stage by measurement of dissipation factor (tan δ) and conductivity at 100 kHz with time. The variation of dielectric strength and specific viscosity of different shellac-epoxy resin blends with time was also investigated. The study has revealed that most of the curing of shellac with epoxy resins in the cold takes place within around six days after blending of the two varnishes. An appreciable improvement in the dielectric strength of the blends was observed. The results suggest that the measurement of the dissipation factor with time may be conveniently used for the study of the curing behaviour of shellac-epoxy resin blends.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051260115
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  • 6
    Electronic Resource
    Electronic Resource
    Mathematical modeling of natural convection in fire - A state of the art review of the field modelling of variable density turbulent flow (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 7 (1983), S. 1-24 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This review concerns the mathematical modeling of fire phenomena. The fire is treated as a head and mass source driving a fluid flow process. Combustion is not included. It deals in detail with the field modeling approach incorporating the effects of turbulence, strong buoyancy and variable density on the transport of momentum, heat and mass. For the sake of simplicity, other effects such as those due to the interactions of the above mechanisms with the wall, radiation, etc., which may be crucial to the dynamics of the fire phenomenon, are not dealt with in this review. These effects will be the subject of future work.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810070102
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  • 7
    Electronic Resource
    Electronic Resource
    High speed puncture impact studies of three low pressure styrene thermoplastic structural foam plaques (1983)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 3 (1983), S. 15-22 
    Details
    ISSN: 0730-6679
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The constant velocity puncture impact characteristics of three polystyrene low pressure thermoplastic structural foam plaques manufactured at identical processing conditions were measured. The test results showed that the impact performance varied, significantly over the plaque but with less variation between plaques. However, the variation does illustrate the difficulty in predicting impact performance of TSF parts. The specimens failed in a brittle manner though some did exhibit ductile compression under the impactor before the plaque failed in a brittle manner. The energy to fracture was satisfactorily correlated with a power law relationship.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1983.060030103
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