Rheological Behavior of Metallocene Catalyzed PE and LDPE Blends

Abstract

Abstract: The rheological behavior was studied for blends of metallocene catalyzed ethylene/1-butene copolymer(mPE) and low density polyethylene(LDPE). Steady-state viscosity and dynamic viscoelasticity were measured by using a DSR-200 rheometer with parallel plate geometry. Non-linear fitting with the modified cross model was conducted successfully. Due to lower molecular weight and narrower molecular weight distribution(M_w/M_n=21),mPEhas a lower sensitivity to shear, shown by a lower zero shear viscosity, higher values of shear rate and shear stress at the transition from Newtonian to non-Newtonian behavior, higher viscosities in shear rate range from 10⁰ s^-1 to 10² s^-11. Zero shear viscosities of mPE/LDPE 50/50 and 25/75(mass ratio) blends have a large positive deviation from log-additivity rule, due to a decrease of the free volume fraction in these blends. The transition stress and non-Newtonian index decrease with increasing LDPEfraction in blends, which indicate that the blends have high sensitivity to shear and improved processability. The single correlation betweenG' andG" corresponds to the behavior expected for a miscible blend.

Key words: Metallocene catalyzed polyethylene, Low density polyethylene(LDPE), Rheological behavior, Blend

CLC Number:

O631

TrendMD:

LIU Chen-Yang, LI Yu-Ying, WANG Jin, HE Jia-Song, ZHANG Lin. Rheological Behavior of Metallocene Catalyzed PE and LDPE Blends[J]. Chem. J. Chinese Universities, 2001, 22(2): 298.

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Rheological Behavior of Metallocene Catalyzed PE and LDPE Blends

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