Abstract
The rheological properties of glass fibre-filled polypropylene melts have been investigated. A high pressure capillary rheometer has been used for the experimental study. The effect of shear rate, temperature, and fibre concentration on the melt viscosity and viscoelastic properties have been studied. An equation has been proposed to correlate the melt viscosity with shear rate, temperature and fibre content. A master curve relation on this basis has been brought out using the shift factora T .
Similar content being viewed by others
Abbreviations
- a T :
-
shift factor (=η/η r )
- A i :
-
coefficients of the polynomical of eq. (1) (i = 0, 1, 2, ⋯,n)
- B :
-
constant in the AFE equation (eq. (2)) (Pa s)
- B′ :
-
constant in eq. (3)
- D :
-
extrudate diameter
- d :
-
capillary diameter
- \(E_{\dot \gamma } \) :
-
activation energy at constant shear rate (kcal/mole)
- E τ :
-
activation energy at constant shear stress (kcal/mole)
- T :
-
melt temperature (K)
- X :
-
fraction glass fibre by weight
- \(\dot \gamma \) :
-
shear rate (s−1)
- η :
-
shear viscosity (Pa s)
- θ :
-
normal stress coefficient\([(\sigma _1 - \sigma _2 )/\dot \gamma ^2 ]\) (Pa s2)
- σ 1 −σ 2 :
-
first normal-stress difference (Pa)
- τ :
-
shear stress (Pa)
- r :
-
at reference temperature
References
Crowson RJ, Folkes MJ (1980) Polym Eng Sci 20:934
Crowson RJ, Folkes MJ, Bright PF (1980) Polym Eng Sci 20:925
Crowson RJ, Scott AJ, Saunders DW (1981) Polym Eng Sci 21:748
Thomas DP, Hagan RS (1966) Soc Plast Ind Reinforced Plastics, Dir. Prepr. 3-C (referred in [14])
Charrier JM, Reiger JM (1974) Fibre Sci Tech 7:161 (referred in [14])
Oyanagi Y, Yamaguchi Y (1975) J Soc Rheol (Japan) 3:64 (referred in [14])
Yamaguchi Y, Oyanagi Y, Ozaki Y (1975) Kobunishi Robonshu 32:393 (referred in [14])
Owen MJ, Whybrew K (1958) Plastics Rubber 62:1248
Chan Y, White JL, Oyanagi Y (1978) Trans Soc Rheol 22:507
Chan Y, White JL, Oyanagi Y (1978) Polym Eng Sci 18:268
Wu S (1979) Polym Eng Sci 19:638
Czarnecki L, White JL (1980) J Appl Polym Sci 25:1217
Oda K, White JL, Clark ES (1978) Polym Eng Sci 18:25
Knutsson BA, White JL, Abbas KB (1981) J Appl Polym Sci 26:2347
Goel DC (1980) Polym Eng Sci 20:198
Han CD (1974) J Appl Polym Sci 18:821
Shenoy AV, Saini DR, Nadkarni VM (1983) Polym Comp 4:53
Gleißle W (1982) Rheol Acta 21:484
Bird RB, Armstrong RC, Hassager O (1977) Dynamics of Polymeric Liquids, Vol 1, John Wiley and Sons
Münstedt H (1978) Kunststoffe 68:92
Rao Natti S (1981) Designing Machines and Dies for Polymer Processing with Computer Programs, Fortran and Basic, Hanser International
Vinogradov GV, Malkin YA (1980) Rheology of Polymers, Mir Publishers
Han CD (1976) Rheology in Polymer Processing, Academic Press, New York
Instruction for Rheograph 2001, Chapt. 11
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Nanguneri, S.R., Rao, N.S. & Subramanian, N. Rheological characteristics of glass-fibre-filled polypropylene melts. Rheol Acta 26, 301–307 (1987). https://doi.org/10.1007/BF01329446
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01329446