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Abstract

ABSTRACT: In this study, the viscoelastic properties of a low-density polyethylene (LDPE) filled with glass beads (GBs) are measured at 150 C by means of a capillary rheometer to identify the effect of the particle size on the melt viscoelasticity. The volume fraction of the GB was 8.4%. The surface of the particles has been treated with a silane-coupling agent and the diameter range was from 4 to 180 mm. The results showed that either the entry pressure drop (P_en) or the entry elongation stress (e) is a linear function of shear stress (w) at the channel wall. The values of both P_en and e of these composite melts are close to each other. This illustrates that the influence of the bead size and its distribution on them is insignificant at low filler concentration. The die-swell ratio (B) increases nonlinearly with an addition of w. When the diameter (d) of the beads is less than 50 mm, B decreases dramatically with an increase of d, especially at low shear stress level, and then it decreases slightly under the given shear stress level.

Keywords

LDPE glass bead composite capillary extrusion melt flow property

References

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Effects of Particle Size on Melt Viscoelastic Properties During Capillary Extrusion of Glass Bead-filled LDPE Composites

Abstract

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