Title: 0840 - Surface Characterization of He-plasma and Deep UV Treated Polyetheretherketone (PEEK)


Seigo Okawa (Presenter)
Niigata University

Norimasa Taka, Niigata University
Yujin Aoyagi, Niigata University
Kenji Izumi, Niigata University


Objectives: This study aimed to characterize the effect of atmospheric helium plasma (He-plasma) as well as deep ultraviolet radiation (UV) on surface properties of PEEKs and shear bond strengths.

Methods: One hundred twenty cylindrical polyetheretherketone (PEEK) specimens with a diameter 10 mm and 5 mm in thickness, polished with #1000 SiC paper and ultrasonically cleaned in distilled water for 10 min, were divided into three groups (n=20/group) as follows: no-treatment, He-plasma treatment for 60 s, and UV treatment for 60 s. For He-plasma treatment, an experimental atmospheric helium plasma generator was used. UV treatment was employed using 172 nm UV light. To characterize PEEK surface after He-plasma and UV treatments, surface energy was calculated from the contact angles and XPS analysis was performed using a Quantum 2000 system. The PEEK specimens were bonded using Super Bond C&B. After all specimens were stored in 37°C water for 24 hours, the shear bond strengths were measured with a universal testing machine at a crosshead speed of 1 mm/min. All data were analyzed using one-way ANOVA (Tukey’s post-hoc test) (p<0.05).

Results: After PEEK surface modification, the surface energy was 66.1±3.2 (He-plasma) and 64.7±2.0 mJ/m2 (UV), which was significantly higher than that for no-treatment group (38.8±0.04 mJ/m2). In addition, the wide XPS scan revealed the molar ratio of carbon to oxygen decreased, and the high-resolution XPS of the C1s spectra detected a new group COO at 288.7 eV. The shear bond strengths of the He-plasma and UV treatments were 12.2±3.8 and 12.4±3.0 MPa, respectively, which was also significantly greater than that for the no-treatment group (5.8±2.3 MPa).

Conclusions: The surface modified PEEKs had higher surface energy and a new chemical group. Moreover, the shear bond strengths improved appreciably. The surface modifications tested in this study could be feasible as viable surface modifications for PEEKs.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE