THE INFLUENCE OF THE MOLECULAR STRUCTURE OF LDPE ON THE PRESSURE COEFFICIENTS OF THE SHEAR AND ELONGATIONAL VISCOSITIES
Tomas Sedlacek, Martin Zatloukal, Petr Filip, Petr Saha
Tomas Bata University in Zlin
Czech Republic

Keywords: viscosity pressure coefficient, various LDPE melts, molecular structure influence

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A capillary rheometer equipped with an especially designed additional chamber ensuring various pressure modes was used to measure the pressure effect on the rheological properties of various LDPE grades with different molecular structure. Based on the research, it can be concluded that the amount of long-chain branching and molecular weight distribution significantly influence the values of pressure coefficient, b.