Study of shear and elongational flow of solidifying polypropylene melt for low deformation rates

V. Kitoko; M. Keentok; R. I. Tanner

Korea-Australia Rheology Journal, Vol.15, No.2, 63-73, June, 2003

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Study of shear and elongational flow of solidifying polypropylene melt for low deformation rates

V. Kitoko, M. Keentok, and R. I. Tanner^†

School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, NSW 2006, Australia

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An experimental technique was developed to determine the strain-rate in a tensile specimen. Then one can calculate the transient isothermal elongational viscosity. Both shear and elongational viscosities were measured to study the effect of shear and elongational fields on the flow properties. The comparison between these viscosities shows that the onset of rapid viscosity growth as crystallization solidification proceeds occurs at about the same value of time at very small deformation rates (0.0028 and 0.0047 s(-1)). The comparison of these measured viscosities as functions of shear and elongational Hencky strains also reveals that the onset of rapid viscosity growths starts at critical Hencky strain values. The behaviour of steady shear viscosity as function of temperature sweep was also explored at three different low shear rates. Finally, the influence of changing oscillatory frequencies and strain rates was also investigated.

Keywords:shear and elongational viscosities;low deformation rates;critical Hencky-strain values;crystallization

[References]

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Chai CK, Auzoux Q, Randrianatoandro H, Navard P, Haudin JM, Polymer, 44(3), 773 (2003)
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Lauritzen JI, Hoffman JD, J. Res. Natl. Bur. Stand., 64A, 73 (1960)
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Macosko CW, Rheology: Principles, Measurements and Applications, Wiley-VCH, New York (1984)
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Tanner RI, Engineering Rheology, 2nd edition, Claredon Press, Oxford (2000)
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Tanner RI, Korea-Aust. Rheol. J., 14(2), 87 (2002)
Viana JM, Mechanical Characterisation of Injection Moulded Plates, Ph.D. Thesis, University of Minho (1999)
Vleeshouwers S, Meijer HEH, Rheol. Acta, 35(5), 391 (1996)
Wassner E, Maier RD, Shear-induced Crystallisation of Polypropylene Melts, XIIIth International Congress on Rheology, Cambridge, UK, 1, 183-185 (2000)

[1] Bashir Z, Odell JA, Keller A, J. Mater. Sci., 19, 3713 (1984)

[2] Boutahar K, Carrot C, Guillet J, Macromolecules, 31, 1921 (1998)

[3] Chai CK, Auzoux Q, Randrianatoandro H, Navard P, Haudin JM, Polymer, 44(3), 773 (2003)

[4] Cunha AM, Godinho JS, Viana JC, Structure Development during Polymer Processing, edited by Cunha, A.M. and Stoyko Fakirov, 255-275, Kluwer Academic Publishers, Dordrecht, The Netherlands (2000)

[5] Han CD, J. Appl. Polym. Sci., 18, 3581 (1974)

[6] Hoffman JD, Lauritzen JI, J. Res. Natl. Bur. Stand., 65A, 297 (1961)

[7] Keller A, Kolnaar JWH, Flow-induced Orientation and Structure Formation, In H.E.H. Meijer, editor, Processing of Polymers, volume 18 of Material Science and Technology: A Comprehensive treatment, chapter 4, 189-268, VCH (1997)

[8] Koscher E, Fulchiron R, Polymer, 43(25), 6931 (2002)

[9] Kumaraswamy G, Issaian AM, Kornfield JA, Macromolecules, 32(22), 7537 (1999)

[10] Lagasse R, Maxwell B, Polym. Eng. Sci., 16, 189 (1976)

[11] Lauritzen JI, Hoffman JD, J. Res. Natl. Bur. Stand., 64A, 73 (1960)

[12] Mackley MR, Keller A, J. Mater. Sci., 10, 1501 (1975)

[13] Macosko CW, Rheology: Principles, Measurements and Applications, Wiley-VCH, New York (1984)

[14] Petermann J, Miles M, Gleiter H, J. Polym. Sci., 17, 55 (1979)

[15] Tanner RI, Engineering Rheology, 2nd edition, Claredon Press, Oxford (2000)

[16] Tanner RI, J. Non-Newton. Fluid Mech., 102(2), 397 (2002)

[17] Tanner RI, Korea-Aust. Rheol. J., 14(2), 87 (2002)

[18] Viana JM, Mechanical Characterisation of Injection Moulded Plates, Ph.D. Thesis, University of Minho (1999)

[19] Vleeshouwers S, Meijer HEH, Rheol. Acta, 35(5), 391 (1996)

[20] Wassner E, Maier RD, Shear-induced Crystallisation of Polypropylene Melts, XIIIth International Congress on Rheology, Cambridge, UK, 1, 183-185 (2000)