Laser and plasma surface treatments of PPS/CF thermoplastic composite laminates for primer adhesion

Date

2023-4-24

Author

Atlıoğlu, Merve

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After production and characterization of Poly(phenylene sulfide) / Carbon Fiber (PPS/CF), thermoplastic composite laminates, the main purpose of this study was, to evaluate effects of “laser” and atmospheric “plasma” surface treatments on the adhesion performance of primer painting by comparing with “untreated” and traditional “sandblasted” samples. For this purpose, after surface characterization of untreated and treated samples by Wettability, SEM, XPS, FT-IR analyses; adhesion characteristics of an industrial primer paint applied onto the surfaces were evaluated by using two different industrial methods: “Cross-cut Adhesion” tests and “Three-point Bending Adhesion” tests. Compared to the Untreated samples, it was observed that all surface treated samples could be assigned with the “best” primer adhesion grade of GT0, and having at least two times more maximum “Separation Load” with “cohesive” separation mechanism of primer paint layers. The success of the Sandblasted samples could be attributed to the increased micro-level surface roughness, while for the Laser treated samples nano-level surface roughness, both of them leading to decreased Contact Angle values, and increased Total Surface Free Energy values. The success of the Plasma treated samples could be attributed to the increased number of chemically reactive sites formed by the oxidation of carbon and sulphur elements in PPS matrix.

Subject Keywords

Poly(phenylene sulfide) (PPS), Carbon Fiber (CF), Primer Painting, Surface Treatments, Sandblasting, Laser Treatment, Plasma Treatment

URI

https://hdl.handle.net/11511/103075

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Graduate School of Natural and Applied Sciences, Thesis