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    Geometrical dependence of viscosity of polymethylmethacrylate melt in capillary flow

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    Publication date
    2013
    Author
    Lin, X.
    Kelly, Adrian L.
    Ren, D.Y.
    Woodhead, Michael
    Coates, Philip D.
    Wang, K.S.
    Keyword
    Viscosity and viscoelasticity
    ; Rheology
    ; Extrusion
    ; Properties and characterisation
    ; Wall-slip
    ; Polymer melts
    ; Rheological behavior
    ; Pressure-dependence
    ; Micro-channels
    ; Rheometry
    ; Shear
    ; Polyethylenes
    ; Extrusion
    ; surfaces
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    Peer-Reviewed
    Yes
    
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    Abstract
    The shear viscosity of polymethylmethacrylate (PMMA) melt is particularly investigated by using a twin-bore capillary rheometer at four temperatures of 210, 225, 240, and 255 degrees C with different capillary dies. Experimental results show that the geometrical dependence of shear viscosity is significantly dependent on melt pressure as well as melt temperature. The measured shear viscosity increases with the decrease of die diameter at lower temperatures (210 and 225 degrees C) but decreases with the decrease of die diameter at higher temperatures (240 and 255 degrees C). Based on the deviation of shear viscosity curves and Mooney method, negative slip velocity is obtained at low temperatures and positive slip velocity is obtained at high temperatures, respectively. Geometrical dependence and pressure sensitivity of shear viscosity as well as temperature effect are emphasized for this viscosity deviation. Moreover, shear viscosity curve at 210 degrees C deviates from the power law model above a critical pressure and then becomes less thinning. Mechanisms of the negative slip velocity at low temperatures are explored through Doolittle viscosity model and Barus equation, in which the pressure drop is used to obtain the pressure coefficient by curve fitting. Dependence of pressure coefficient on melt temperature suggests that the pressure sensitivity of shear viscosity is significantly affected by temperature. Geometrical dependence of shear viscosity can be somewhat weakened by increasing melt temperature. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3384-3394, 2013
    URI
    http://hdl.handle.net/10454/9681
    Version
    No full-text in the repository
    No full-text in the repository
    Citation
    Lin X, Kelly AL, Ren DY et al (2013) Geometrical dependence of viscosity of polymethylmethacrylate melt in capillary flow. Journal of Applied Polymer Science. 130(5): 3384-3394.
    Link to publisher’s version
    http://dx.doi.org/10.1002/app.39591
    Type
    Article
    Collections
    Engineering and Informatics Publications

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