Expert News: Oxygen plasma treatment of high performance fibres for composites
Oxygen plasma treatment of high performance fibres
At Henniker Plasma we pride ourselves on our depth of knowledge of Plasma Technology and like to keep ourselves up to date on the latest research topics. Our new ‘Expert News’ feed aims to share interesting research articles and industry news with you, both here and on our Social Networks.
This month’s article is an interesting publication on oxygen plasma surface treatment of composite fibres.
Plasma Treatment of High performance fibres for composites
G.M Wu, Tel.: +886-3-2118800×3155; fax: +886-3-2118668. Courtesy of Copyright © 2004 Elsevier B.V. All rights reserved.
High performance rigid-rod polymeric materials provide potential applications as reinforcement fibers for advanced composites. In this study, we investigated the surface modification of poly(1,4-phenylene-cis-benzobisoxazole) (PBO) fiber by oxygen plasma treatments. Kevlar and carbon fibers were also examined for comparison. The corresponding changes in the surface free energy components were carefully evaluated using a Cahn dynamic contact angle analysis system.
The results showed that the total surface free energy (γ) of PBO fiber was increased from 43.3 to 61.1 mJ m−2 (by 41%) using 70 W oxygen plasma treatment for 5 min. The polar component of the surface free energy increased much more readily than the dispersive component. In addition, the untreated PBO fiber had a tensile strength of 5.72 GPa while the treated PBO fiber had an average of 5.55 GPa. This represented a small reduction of only 3%.
The effect of oxygen plasma treatment on the composite’s interfacial adhesion property was carried out using microbond fiber pull-out test. The interfacial shear strength increased from 34.7 MPa for the untreated PBO fiber system to 44.7 MPa, after the oxygen plasma treatment for 5 min. It has been suggested that oxygen plasma is an effective process for rigid-rod PBO fiber.
- Oxygen plasma
- PBO fiber
- Surface property
- Interfacial shear strength