Abstract
AbstractSignificantly enhanced adhesion of polytetrafluoroethylene (PTFE) films to graphene‐filled polyimide (PI) adhesives by argon (Ar) cold atmospheric pressure plasmas (CAPPs) at the exposure durations of 72–96 s was undertaken. Poor adhesion of PTFE film to PI adhesive with no bonding (100% delamination) was highly improved to good bonding (100% attachment) for PTFE film treated by Ar CAPPs. Hydrophobic PTFE surface (water contact angle up to 91.1°) was changed to hydrophilic PTFE surfaces (water contact angle up to 37.4°–66.0°) with Ar CAPPs treatment by formation of polar chemical bonds such as C–O and C=O. To realize how the chemical bonds of C–O and C=O were produced onto the PTFE surface by Ar CAPPs, the plasma active species of Ar CAPPs were detected by optical emission spectroscopy.
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