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  • Polymer and Materials Science  (10)
  • altered free volume  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Interpretation of flow data for multicomponent polymeric systems (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 846-854 
    Details
    ISSN: 1435-1536
    Keywords: Melt flow index ; multicomponent polymeric systems ; altered free volume ; state concept
    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 model based on the altered free volume state concept has been proposed here to predict the melt flow index values of multicomponent systems as a function of the amount of the dispersed phase. The predictions of the model have been compared with experimental results reported in the literature on a diverse range of multicomponent polymeric systems. The agreement between the model predictions and the experimentally determined values is good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421438
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  • 2
    Electronic Resource
    Electronic Resource
    A model for predicting elongational viscosity of polymer blends (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 151 (1987), S. 95-101 
    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 wird ein Modell vorgeschlagen, nach dem die Dehnungsviskosität von Blends mit der Theorie des Freien Volumens so korreliert werden kann, daß die Dehnungsviskosität eines Blends für jede Zusammensetzung aus den Dehnungsviskositäten und dem Gewichtsbruch der Komponenten bestimmt werden kann. Die Voraussagen des Modells wurden an experimentellen Daten in vier Fällen überprüft.
    Notes: A model has been proposed to correlate the elongational viscosity of blends with the free volume theory so that the elongational viscosity of a blend at any composition can be determined from the elongational viscosity and the weight fractions of the individual components. The predictions of the model are compared with experimental data in four cases and found to give reasonable good agreement.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051510107
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of highly loaded ferrite-filled thermoplastic elastomerNCL Communication No. 3407. (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 4123-4143 
    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 dynamic mechanical properties in terms of the storage modulus E′, loss modulus E″, and the loss tangent δ has been studied for highly filled magnetic polymer composites. The effect of surface treatment on the relaxation spectra has been clearly elucidated and quantitative values indicating the extent of polymer-filler interactions have been given. Various models have been tested for describing the viscoelastic behavior of such highly filled systems. The Wiechert model using a single-arm with a Cole-Cole parameter has been shown to effectively fit the Argand diagram in the case of the present highly filled systems.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291244
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  • 4
    Electronic Resource
    Electronic Resource
    PVC calendering: A simplified prediction techniqueNCL Communication No. 3334. (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1-18 
    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: A simplified technique for prediction of pressure distribution, velocity profiles, torque, and power requirements for the calendering of power-law fluids is presented. The technique assumes isothermal conditions, is based on the lubrication approximation and Gaskell's analysis, and uses melt flow index as the only temperature-dependent resin parameter for the prediction. The predictions are found to compare favorably with those made by Vlachopoulos and Hrymak for rigid PVC.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300101
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  • 5
    Electronic Resource
    Electronic Resource
    Upgrading the melt flow index to rheogram approach in the low shear rate regionNCL Communication No. 3149. (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 1581-1593 
    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 unified viscosity function curves proposed earlier by the authors have an inherent limitation in the low shear rate region. This limitation is the effect of using the melt flow index as a normalizing factor to obtain the coalesced curves, which itself is insensitive to molecular parameters such as molecular weight distribution. A single integral constitutive equation of the BKZ type is used to derive the viscosity function which would be useful in generating unified curves based on the melt flow index but devoid of the limitation of molecular weight distribution effects in the low shear rate region.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290513
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  • 6
    Electronic Resource
    Electronic Resource
    Rheograms of cellulosic polymers from the melt flow index (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 4399-4408 
    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: Data on the variation of melt viscosity over a wide range of shear rates and temperatures are necessary in the processing of cellulosic polymers. An effective method has been proposed to estimate the viscosity vs. shear rate flow curves of a cellulosic resin at temperatures relevant to the processing conditions, from its melt flow index and glass transition temperature. The method involves the use of a master curve obtained by coalescing the rheograms of various grades in terms of a modified viscosity, η·MFI, and a modified shear rate, γ·/MFI. Master curves have been reported for cellulose esters and ethers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070271129
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  • 7
    Electronic Resource
    Electronic Resource
    Quick estimation of dilute polymer solution rheology and activation energy (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 41-48 
    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: A simple method for estimation of dilute polymer solution kinematic viscosity versus shear rate curve at temperature of interest and activation energy for viscous flow through the use of efflux time measurement is demonstrated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330104
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  • 8
    Electronic Resource
    Electronic Resource
    Re-analysis of extensional flow data of polymer melts (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 135 (1985), S. 77-84 
    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: Das Dehnfließverhalten ist sehr wichtig bei polymeren Herstellungsprozessen wie Faserspinnen und Filmblasen, doch es gibt nur spärliche experimentelle Daten in der Literatur wegen der inhärenten Schwierigkeiten bei der Messung der entsprechenden Fließparameter. In dieser Arbeit ist der Versuch gemacht worden, die vorhandenen zugänglichen Daten des Dehnfließens von drei verwandten Typen von Polymerschmelzen durch eine logarithmische Auftragung der modifizierten Dehnviskositätsfunktion ηE · MFI und einer modifizierten Dehngeschwindigkeit (ε/MFI)2, zu korrelieren. Diese Methode kann auf andere Polymersysteme übertragen werden.
    Notes: Extensional flow behaviour is very important in polymer processing operations such as fiber spinning and film blowing but there is scanty experimental data in the literature due to inherent difficulties in measurement of the relevant flow parameters. In the present paper, an attempt has been made to correlate the existing available data on the extensional flow of three generic types of polymer melts through a logarithmic plot of modified extensional viscosity function, ηE · MFI, and a modified extension rate, (ε/MFI)2. The method may be extended to other polymeric systems.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051350107
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  • 9
    Electronic Resource
    Electronic Resource
    A new shift factor for coalescing dynamic viscoelastic data of polymer melts (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 504-507 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein neuer Verschiebungsfaktor für die zusammenfassende Darstellung der Ergebnisse dynamisch-viskoelastischer Messungen an Polymerschmelzen wird eingeführt. Es wird gezeigt, daß, wenn der Schmelzindex als Verschiebungsfaktor verwendet wird, kein willkürlicher Bezugswert notwendig ist und die vereinigten Kurven sowohl von der Temperatur als auch vom Typ des jeweiligen Polymers unabhängig sind. Die Brauchbarkeit des neuen Verschiebungsfaktors für Polyethylen hoher Dichte und für Polystyren wird gezeigt. Die Methode kann leicht auf andere Polymere übertragen werden.
    Notes: A new shift factor has been introduced for representing dynamic viscoelastic data of polymer melts. It has been shown that when the melt flow index is used as the shift factor, no arbitrary reference value is required and the coalesced curves are independent of temperature as well as of the grade of the polymer. The utility of the shift factor is demonstrated with high density polyethylene and polystyrene. The method can easily be extended to other polymers as well.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370808
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  • 10
    Electronic Resource
    Electronic Resource
    Melt flow index: More than just a quality control rheological parameter. Part IIFor Part I. refer to Adv. Polym. Tech., 6, 1-58 (1986). (1986)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 6 (1986), S. 125-145 
    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
    Additional Material: 33 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1986.060060201
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