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Polymers 2018, 10(2), 122; https://doi.org/10.3390/polym10020122

The Dispersion of Pulp-Fiber in High-Density Polyethylene via Different Fabrication Processes

1
Key Lab of Bio-based Material Science Technology of Education Ministry, Northeast Forestry University, Harbin 150040, China
2
CSIRO Manufacturing, 75 Pigdons Road, Waurn Ponds, VIC 3216, Australia
*
Author to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 17 January 2018 / Accepted: 24 January 2018 / Published: 26 January 2018
(This article belongs to the Special Issue Olefin Polymerization and Polyolefin)
Full-Text   |   PDF [3896 KB, uploaded 26 January 2018]   |  

Abstract

In this study, a pulp beating machine was used to premix the pulp fibers with high density polyethylene (HDPE) particles in water. The wet or pre-dried pulp fiber/HDPE mixture was then melt-compounded by a twin screw extruder. For further improving the dispersion of pulp fiber, some mixture was forced to pass through the twin-screw extruder twice. The resulting mixture was compression molded to the composite. The fiber distribution was observed by the aid of an optic and scanning electron microscope. The mechanical and rheological properties and creep resistance of the composites were characterized. Test results demonstrate that when the wet pulp fiber/HDPE mixture was subjected to pre-pressing and oven drying prior to extrusion compounding, the resulting composites exhibited homogeneous fiber distribution, superior flexural property, creep-resistance, and high storage modulus. Particularly, its flexural strength and modulus were 57% and 222% higher, respectively, than that of the neat HDPE, while the composites prepared without pre-dried were 19% and 100% higher, respectively. Drying the wet mixture in advance is more effective than re-passing through the extruder for improving the fiber dispersion and composite performance. View Full-Text
Keywords: pulp fiber; polyethylene; composites; fiber dispersion; drying pulp fiber; polyethylene; composites; fiber dispersion; drying
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yang, X.; Wang, G.; Miao, M.; Yue, J.; Hao, J.; Wang, W. The Dispersion of Pulp-Fiber in High-Density Polyethylene via Different Fabrication Processes. Polymers 2018, 10, 122.

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