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  • 1
    Electronic Resource
    Electronic Resource
    Longitudinal volume viscosity of 1,4 cis polybutadiene (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 975-983 
    Details
    ISSN: 1435-1536
    Keywords: Polybutadiene (cis) ; volumeviscosity ; melt compressibility
    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 Volume flow of 1,4 cis polybutadiene (1,4 cis PB) of ¯M n =311.900,T g =156 K, andT m =266 K, has been measured. Elastic modulus of the elastic wave, longitudinal volume viscosity, initial longitudinal volume viscosity, and retardation times are described at compression rates of ca. 1.0 to 200.0×10−5 s−1, and at temperatures of 293 K to 373 K, and pressures up to 150 MPa. Longitudinal volume viscosity decreases with increasing compression rate, and with decreasing volume deformation, the behavior being in all cases a typical non-equilibrium one. Longitudinal volume viscosity decreases with increasing temperature (except at 293 K), the volume flow activation energy being of about 18.2 KJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01428805
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  • 2
    Electronic Resource
    Electronic Resource
    Longitudinal volume viscosity of poly (vinyl chloride) (1984)
    Springer
    Rheologica acta 23 (1984), S. 31-39 
    Details
    ISSN: 1435-1528
    Keywords: Volume viscosity ; compressibility ; shift factor ; poly(vinyl chloride)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The volume flow of poly (vinyl chloride) ( $$\bar M_n = 45,000$$ = 45,000,T g = 350 K) has been measured in an Instron Capillary Rheometer. The elastic modulus in longitudinal compression, the longitudinal volume viscosity and initial longitudinal volume viscosity, and retardation times were determined at temperatures both below (324 – 343 K) and above (403 – 453 K) the glass transition temperatureT g , and at compression rates between approximately 10−5 and 200 · 10−5 s−1. An increase in the longitudinal volume viscosity was observed for decreases in the volume deformation, increases in the compression rate and increases in temperature.T g decreased at 0.16 K/MPa. The volume flow activation energy was found to be equal to that for shear flow with a constant value of 91.37 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333873
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  • 3
    Electronic Resource
    Electronic Resource
    Compression creep of molten poly (butylene terephthalate) (1988)
    Springer
    Rheologica acta 27 (1988), S. 634-638 
    Details
    ISSN: 1435-1528
    Keywords: Compressioncreep ; compression creepcompliance ; volumeviscosity ; poly(butylene terephthalate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Viscoelastic parameters of poly(butylene terephthalate) melt in compression creep have been measured in an Instron Capillary Rheometer. Bulk compression creep complianceB(t) shows plateau regions in the molten state and in the melt crystallized state, both decreasing with increasing stress. Shifting ofB(t) curves provides master curves suitable for analyzing the total (superposed elastic and viscous) bulk compression behavior. Volume viscosity decreases with both increasing stresses and compression rates but seems to be independent of temperature. Its values are larger than those from constant compression rate experiments, possibly due to the presence of elastic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01337459
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  • 4
    Electronic Resource
    Electronic Resource
    Elongational, shear and volume viscosities of polymer melts (1988)
    Springer
    Rheologica acta 27 (1988), S. 61-68 
    Details
    ISSN: 1435-1528
    Keywords: Elongationalviscosity ; shearviscosity ; volumeviscosity ; polymermelt ; scaling equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Volume viscosity of polypropylene, polystyrene, and low density polyethylene are described. Shear, elongational, and volume viscosities may be interrelated with the help of scaling equations. They explain the effect on elongational viscosity of strain rates, stresses, and strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372451
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  • 5
    Electronic Resource
    Electronic Resource
    Compression creep of molten polystyrene (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 181 (1990), S. 53-66 
    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 Viskoelastizitäts-Parameter von geschmolzenem Polystyrol (PS) wurden mit einem Instron-Kapillarrheometer gemessen.Die Drucknachgiebigkeit B(t) zeigt ein Plateau sowohl im Schmelze (B1)- als auch im Glaszustand (Bg); beide nehmen mit abnehmender Spannung ab. Durch Verschiebung der B(t)-Kurven werden Master-Kurven erhalten, mit denen das Gesamtdruckverhalten (überlagerte elastische und viskose Deformationen) analysiert werden kann. Die stationäre Nachgiebigkeit (Bs) erlaubt eine Beschreibung des elastischen Energieanteils und scheint mit der Extrusions-Strangaufweitung (Bcs/Bds) korreliert zu sein. Die Volumenviskosität (ηk) nimmt mit zunehmender Spannung (P), zunehmender Belastungsgeschwindigkeit (k) und abnehmender Temperatur ab.
    Notes: Viscoelastic parameters of polystyrene (PS) melt in compression creep have been measured in an lnstron capillary-rheometer.Bulk compression creep compliance B(t) shows plateau regions in the molten state (B1) and the glassy state (Bg), both decreasing with increasing stress. Shifting of B(t) curves provides master curves suitable to analysing the total (superposed elastic and viscous deformations) bulk compression behaviour. The steady-state creep compliance (Bs) allows to describe the recoverable elastic energy (Be) and seems to be related to the extrusion die swell (Bcs/Bds). Volume viscosity (ηk) decreases with decreasing stress (P), increasing compression rates (k) and decreasing temperature (T).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051810104
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  • 6
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of poly(butylene terephthalate) (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 133 (1985), S. 141-146 
    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: Es wurde die spezifische Wärme von Poly(butylenterephthalat) mit Hilfe eines Differentialthermoanalysators (Mettler TC 10) gemessen. Die Glastemperaturen, das Schmelzverhalten sowie die Enthalpien, Entropien, Gibbsschen Freien Energien und die Starrheit der Ketten werden beschrieben.
    Notes: Specific heat of poly(butylene terephthalate) was measured in a Mettler TC 10 differential thermal analyzer. Its glass transition, melting behaviour, as well as its enthalpy, entropy, Gibbs free energy, and the rigidity of the chains are described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051330111
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  • 7
    Electronic Resource
    Electronic Resource
    Longitudinal volume viscosity of epoxide prepolymers (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 1971-1984 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Volume flow of epoxide prepolymers and the effect of compression rate, temperature, and molecular weight on it are described. An increase in longitudinal volume viscosity with decreasing volume deformation, increasing compression rate, and increasing temperature has been observed. The molecular weight seems to have no influence.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200801
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  • 8
    Electronic Resource
    Electronic Resource
    Longitudinal volume viscosity of epoxide prepolymers (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 635-635 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210233
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  • 9
    Electronic Resource
    Electronic Resource
    Compression creep of molten low-density polyethylene (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1017-1025 
    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: Viscoelastic parameters of low-density polyethylene melt (LDPE) in compression creep have been measured. Volume deformation (k%) increases as pressure (P) increases and temperature (T) decreases. Plots of the bulk creep compliance B(t) vs. time (t) may be shifted to provide master curves. As the pressure and the temperature increase, the pressure shift factors (bp and ap) increase almost linearly [activation volumes (ΔV*) varying from 1.0 to 15.0 cm3 mol], while the temperature-shift factors (bT and aT) decrease. The steady-state creep compliance (Bs) describes the recoverable storage of elastic energy (Be) and seems to be related to the extrusion die-swell (Bsc/Bsd). Volume viscosity (ηK) decreases with increasing stress (P) and increasing temperature (T).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440611
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  • 10
    Electronic Resource
    Electronic Resource
    Longitudinal volume viscosity of poly(methyl methacrylate)Dedicated to Professor Herman F. Mark on the occaision of his 90th birthday. (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 2631-2649 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Volume flow of poly(methyl methacrylate) (PMMA) (M̄n = 43,000 and Tg = 384) has been measured in an Instron Capillary Rheometer. Elastic modulus of the longitudinal wave, longitudinal volume viscosity, initial longitudinal volume viscosity, and retardation times are described at temperatures above Tg (418-483K) and compression rates of about 1.00-200.00 × 105 s-1. An initial increase followed by a decrease in longitudinal volume viscosity has been observed as the compression rate increases and the volume deformation decreases, this last behavior being at the lowest values of the compression rate (6.0 and 30.0 × 10-5 s-1) a typical nonequilibrium one. ηL also increases with increasing temperature (Tg decreases 0.18°C/MPa), and volume flow activation energy decreases as the volume deformation increases.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080261002
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