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