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Rheologica Acta

, Volume 58, Issue 3–4, pp 183–192 | Cite as

Influence of interfacial condition on rheological instability behavior of UHMWPE/HDPE/nano-SiO2 blends in capillary extrusion

  • Lichao Liu
  • Fei Wang
  • Ping XueEmail author
  • Suwei Wang
Original Contribution
  • 39 Downloads

Abstract

In this study, rheological behaviors and capillary extrusion flow instabilities of ultra-high molecular weight polyethylene (UHMWPE)/high-density polyethylene (HDPE)/SiO2 composites containing modified nano-SiO2 or pure nano-SiO2 are investigated. Effects of interfacial conditions between the dispersed nano-SiO2 phase and PE matrix on rheological behaviors are analyzed. The results show that modified nano-SiO2 in the PE matrix has a relatively strong interfacial interaction with the polymer chains compared with pure nano-SiO2, thus causing a more pronounced shear thinning behavior and reducing extrudate swell during capillary extrusion. Nanocomposite extrudates experience the transition of smooth- sharkskin- oscillating distortion—overall melt fracture with the increase of shear rate (or shear stress). The interfacial interaction allows a more storage of elastic energy as the melt flow through the die, resulting in sharkskin distortion and oscillating distortion to occur prematurely at critical shear rates. It also restricts the elastic recovery of the melt after leaving the die, thus delaying sharkskin distortion under shear stress. At high shear rates, the modified nano-SiO2 particles begin to roll, and some of the unmodified particles move and embed to the wall. It is believed that the interfacial adsorption effect and the wall-slip effect of nanoparticles exist simultaneously in the whole extrusion process.

Keywords

Rheology Melt fracture UHMWPE Nano-silica Interfacial condition 

Notes

Funding information

The authors would like to acknowledge the support of the National Natural Science Foundation of China (No. 51673021).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Plastic Machinery and EngineeringBeijing University of Chemical TechnologyBeijingChina
  2. 2.School of Material and Mechanical EngineeringBeijing Technology and Business UniversityBeijingChina

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