Exploration of a novel method to treat graphite fibers to enhance the surface topography vis-à-vis fibre-matrix adhesion
Abstract
Fiber-matrix interface is one of the most critical parameters controlling the performance of fiber-reinforced polymer composites (FRPs). During manufacturing of carbon/graphite fibers, sizing agent is applied on the fibers with a view to enhance the fiber-matrix bonding. However, it is customized for particular polymers, generally epoxies and hence not compatible for other polymers, especially thermoplastics. Hence, It is necessary to get rid of it first and then to apply appropriate one or to use a mechanism which will enhance the adhesion of de-sized fibers with the selected matrix. This work reports on the novel approach of Calcium hypochlorite treatment to the de-sized fibers, which led to the roughening of fibers as supported by FESEM (Field Emission Scanning Electron Microscopy) and AFM (Atomic force microscopy) analysis. Various methods such as matrix pick-up test, contact angle measurement, FTIR (Fourier-transform infrared spectroscopy) and XPS (x-ray photoelectron spectroscopy) were employed to understand the influence of the treatment on fibers. Finally, three composites were developed using identical processing conditions based on virgin fabric, de-sized fabric and de-sized-treated fabric and PAEK (Polyaryletherketone) as a matrix. These composites were characterized for physical and mechanical properties, impact strength and ILSS (Interlaminar shear strength). It was concluded that treatment was significantly beneficial to enhance the fiber-matrix adhesion. However, efforts to optimize the duration of treatment are further required.
- Publication:
-
Surface Topography: Metrology and Properties
- Pub Date:
- March 2020
- DOI:
- 10.1088/2051-672X/ab77d6
- Bibcode:
- 2020SuTMP...8a5011M
- Keywords:
-
- surface roughness;
- polyaryletherketone;
- graphite fibers;
- calcium hypochlorite treatment