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  • 1
    Electronic Resource
    Electronic Resource
    Influence of superimposed steady shear flow on the dynamic properties of polyethylene melts (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 475-481 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Experiments in which an oscillatory shear flow is superimposed on a steady state shear flow were performed on polyethylene melts by the use of a cone and plate type rheogoniometer. The phase difference between oscillatory shear stress and shear strain increases in all cases and for all frequencies with the increase of the superimposed shear rate. Between ω0, the frequency at which the phase difference is π/2 and the steady shear rate \documentclass{article}\pagestyle{empty}\begin{document}$ \dot \gamma $\end{document}, as found by Booij for polymer solution, the relation ω0 = 1/2 \documentclass{article}\pagestyle{empty}\begin{document}$ \dot \gamma$\end{document}. holds also for polyethylene melts. The significance of this relation is discussed briefly from the viewpoint that the entanglement density decreases with the increase of the imposed shear rate.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070303
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  • 2
    Electronic Resource
    Electronic Resource
    Viscosity of polydimethylsiloxane-pentamer systems (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 973-986 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Viscosities of polydimethylsiloxane-pentamer systems were measured over the whole range of concentration. Twelve samples having molecular weights from about 1000 to 5 × 105 were studied. The empirical reduction scheme, plots of log η versus log cM0.68, suggested by Ferry and co-workers is applicable to samples of M̄v ≥ 22,000 over the entire concentration. Such satisfying superposition of data may be attributed to the systems being the homologous mixtures in which glass temperatures of polymers are very low. On the basis of the treatment of Fox and Allen, the effects of the number and weight-average molecular weight on viscosity were examined, and the friction coefficient ζ per chain atom at constant M̄n was calculated over a wide range of M̄n. The value ζ is almost constant (ζ = 7.4 × 10-9 dyne-sec./cm.) in the region of M̄n ≥ Mc, and where otherwise it decreases rapidly with decreasing M̄n. The length of the chainend segment was tentatively calculated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.160050513
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  • 3
    Electronic Resource
    Electronic Resource
    Flow properties of polyethylene melt (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 939-953 
    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: Flow properties for low-density and high-density polyethylene over a broad range of shear stress are described. Flow equations presented in literatures are tested from the point of view of the extrapolating method for evaluating the zero shear viscosity. It is shown that the method based on the equation of Cross gives relatively good results. The recoverable shear strain calculated from the capillary end correction is practically equal to that determined from the creep experiment at the same shear stress. The effect of shear stress on the elastic property is examined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120426
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  • 4
    Electronic Resource
    Electronic Resource
    Time-dependent capillary flow of polyethylene melt (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 1505-1513 
    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: The variation of output rate with extrusion time is examined experimentally for capillary flow of high density polyethylene melt. The increase in output rate is divided into two parts. One of these is due to the decrease in the amount of the material in the reservoir and is well interpreted from the consideration of the so-called reservoir effect. The other part is mainly attributed to the disentanglement or orientation of polymer chain during flow in the reservoir.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120702
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  • 5
    Electronic Resource
    Electronic Resource
    Steady-flow viscous and elastic properties of polyisobutylene solutions in low molecular weight polybutene (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 1975-1984 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Shear stress and first normal-stress difference of polyisobutylene dissolved in low molecular weight polybutene (concentrations 0.7 to 19 wt-%) were measured as a function of the shear rate. The dependence of viscosity η on shear rate \documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document} was represented by the equation η = η∞ + (η0 - η∞)/(1 + α\documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document}n) proposed by Cross, where the subscripts (0 and ∞) denote values at infinitesimal and infinite rate of shear, α is a constant associated with rupture of entanglement linkages, and n is a constant. The empirical value of n is 10/13 for 19% solution and 2/3 for the other solutions. The concentration dependence of α was roughly expressed as α = 104 c2.7, where c is the concentration in grams polymer per milliliter solution. The first normal-stress coefficient ψ12 can be represented by ψ12 = ψ12∞ + (ψ12∞ - ψ12∞)/(1 + β\documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document}m). The analysis of data based on the equations shows that m = 2n and β ≈ α2. The steady-state compliance Je was calculated from the relation Je = ψ120/2(η0 - ηs)2, where ηs is the solvent viscosity. Je shows a maximum at about c = 0.03 and is directly proportional to c-2 in the higher region of c.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.180111008
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  • 6
    Electronic Resource
    Electronic Resource
    A note on the capillary flow of polydimethylsiloxane (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1326-1327 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040532
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  • 7
    Electronic Resource
    Electronic Resource
    Flow behavior of polydimethylsiloxane (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 2947-2954 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Viscosities of polydimethylsiloxane were measured over a wide range of shear rates and molecular weights to clarify the flow behavior of bulk polymers. It was observed that each flow curve for high molecular weight samples had an inflection point, and at high shear rates all curves tended to converge. The relationship between viscosities and molecular weights at various shear rates showed the following features: no sharp inflection in the zero shear relation and non-Newtonian properties below Mc. It is suggested that viscosities of high molecular weight samples become almost the same, irrespective of molecular weight, at very high shear rates.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030821
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  • 8
    Electronic Resource
    Electronic Resource
    Viscosity of polydimethylsiloxane blends (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 3071-3089 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zero shear viscosities of two-component blends of polydimethylsiloxane with different molecular weights were measured over the whole range of composition. Results are analyzed on the basis of the conventional treatments for the viscosity of polymer blends and some comments are made on such treatments of data. After that, an empirical equation is derived: \documentclass{article}\pagestyle{empty}\begin{document}$\log {\rm \eta b}1 = \frac{{v_1 (1 - a)}} {{1 - av1}}\log \eta 1 + \frac{{v_2 }} {{1 - av1}}\log \eta _2 $\end{document} where η is the viscosity, v the volume fraction, subscripts 1, 2, and bl denote the lower and higher molecular weight component and the blend, respectively, and a is a constant independent of composition. The equation is not only applicable to all series of blends of polydimethylsiloxane but also to other polymers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150051209
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  • 9
    Electronic Resource
    Electronic Resource
    Viscosity-molecular weight relationship for polydimethylsiloxane (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 4 (1966), S. 317-322 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.110040503
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of dynamic properties of polyisobutylene-decalin system in superimposed steady shear flow (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 449-452 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.110090608
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