Mechanical and tribological properties of ultra⁃high molecular weight polyethylene/sepiolite fiber composites

doi:10.19491/j.issn.1001-9278.2022.05.004

Abstract

Abstract:

Sepiolite fibers （Sep） were modified with a silane?coupling agent （KH550）， and the ultra?high molecular weight polyethylene （PE?UHMW）/Sep and PE?UHMW/modified Sep （O?Sep） composites were prepared on a flat vulcanizer using a hot?pressing method. The surface structure of Sep and O?Sep and the mechanical and tribological properties of the composites were investigated using an infrared spectrometer， an electronic universal testing machine， and a scanning electron microscope. The results indicated that the KH550 molecules covered the surface of O?Sep， resulting in a uniform distribution of O?Sep in the composites. When the content of O?Sep fibers reached 6 wt%， the composites exhibited the optimal performance with tensile strength of 32.1 MPa， flexural strength of 171.2 MPa， flexural modulus of 138.3 GPa， and impact strength of 17.62 kJ/mm²， which were 41.4 %， 40.0 %， 95.6 %， and 36.9 % higher than those of pure PE?UHMW， respectively. The composites also revealed a friction factor of 0.124 and a wear amount of 0.1 mg， which were 77.1 % and 80 % higher than those of pure PE?UHMW， respectively.

Key words: ultra?high molecular weight polyethylene, sepiolite fiber, composite, mechanical property, tribological behavior

CLC Number:

TQ325.1⁺2

WANG Ke, LONG Chunguang. Mechanical and tribological properties of ultra⁃high molecular weight polyethylene/sepiolite fiber composites[J]. China Plastics, 2022, 36(5): 19-23.

Figures/Tables 6

Fig.1. FTIR spectra of the samples

Fig.2. Tensile property of the samples

Fig.3. Bending properties of the samples

Fig.4. Impact property of the samples

Fig.5. Tribological properties of the samples

Fig.6. SEM images of wear surface of PE?UHMW and its composites

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