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Lubricants 2016, 4(3), 31; doi:10.3390/lubricants4030031

Synthesis and Tribological Behavior of Ultra High Molecular Weight Polyethylene (UHMWPE)-Lignin Composites

1
Department of Mechanical Engineering, University of North Dakota, Grand Forks, ND 58201, USA
2
Department of Chemical Engineering, University of North Dakota, Grand Forks, ND 58201, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Robert J. K. Wood
Received: 9 June 2016 / Revised: 12 August 2016 / Accepted: 18 August 2016 / Published: 31 August 2016
(This article belongs to the Special Issue Green Tribology)
View Full-Text   |   Download PDF [7989 KB, uploaded 31 August 2016]   |  

Abstract

In this paper, we report the synthesis and characterization of ultra-high molecular weight polyethylene (UHMWPE)-lignin composites. During this study four different compositions, namely UHMWPE, UHMWPE-13 wt. % lignin, UHMWPE-25 wt. % lignin and UHMWPE-42.5 wt. % lignin were fabricated by hot pressing. Detailed microstructural studies by scanning electron microscopy (SEM) showed that UHMWPE and UHMWPE-13 wt. % lignin had a uniform microstructure, whereas UHMWPE-25 wt. % lignin and UHMWPE-42.5 wt. % lignin samples were riddled with pores. UHMWPE and UHMWPE-13% lignin showed comparable flexural strengths of ~32.2 MPa and ~32.4 MPa, respectively. However, the flexural strength dropped drastically in UHMWPE-25 wt. % lignin and UHMWPE-42.5 wt. % samples to ~13 MPa and ~8 MPa, respectively. The tribology of UHMWPE-lignin composites is governed by the tribofilm formation. All the compositions showed similar µmean values and the specific wear rates (WR) decreased gradually as the concentration of lignin in UHMWPE was increased. View Full-Text
Keywords: lignin; UHMWPE; mechanical behavior; tribology; particulate additives lignin; UHMWPE; mechanical behavior; tribology; particulate additives
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MDPI and ACS Style

Gupta, S.; Riyad, M.F.; Ji, Y. Synthesis and Tribological Behavior of Ultra High Molecular Weight Polyethylene (UHMWPE)-Lignin Composites. Lubricants 2016, 4, 31.

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