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

Ji-ZHAO Liang

College of Industrial Equipment and Control Engineering South China University of Technology Guangzhou 510641, P.R. Chinascutjzl{at}163.com

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 (Pen) or the entry elongation stress (e) is a linear function of shear stress (w) at the channel wall. The values of both Pen 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.

Key Words: LDPE • glass bead • composite • capillary extrusion • melt flow property

Journal of Thermoplastic Composite Materials, Vol. 19, No. 6, 703-713 (2006)
DOI: 10.1177/0892705706067491
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