Plasma Surface Treatment Overview - Carbon Fiber

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Information about Plasma Surface Treatment Overview - Carbon Fiber

Published on June 29, 2016

Author: RMXTechnologies

Source: slideshare.net

1. Feasibility Demonstrated, some engineering remains before scaling. Advantages  Enhanced bonding to existing resins and sizings  Higher performing parts with same CF content  Lower CF content per part for same mech. performance  Bond to new resin systems  More environmentally friendly than wet chemical methods.  Lower the cost of composites Compatible with all precursors. Plasma Surface Treatment – Distinct Advantages

2. Pre-treatment Oxidation Carbonization Surface treatment Sizing Spooling Typical PAN-Based Carbon Fiber Conversion POST-TREATMENT

3. A Comparison of Surface Treatment Methods Industrial Practice Gaseous Surface Treatment

4. Key factors Influencing the Fiber/Resin Bond •Compressive stress at the interface due to the cure volume shrinkage of the matrix: control of the cure of the matrix at the interface and creation of a buffer zone to limit that inherent effect. Styrene monomer Vinyl ester monomer Carbon fiber COOH OH Coupling agent Covalent bonding, functional group reactive with –OH and COOH. Covalent bonding, functional group reactive with C=C • Mechanical interlocking: increase of the surface area of the fiber (increase of the roughness of the surface) by thermochemical surface treatment •Presence of defect: removal of the weakly boundary layers located at the surface of the fibers by thermochemical surface treatment •Physical interactions (polar, dispersive): increase of the surface energy of the fiber and its polar component due to the creation of oxycarbonated functionalities (-OH, -COOH mainly) by thermochemical surface treatment, better wetting. •Chemical interactions: creation of covalent bond by the grafting of coupling agents

5. Gas Phase Surface Treatment – Two Methods Atmospheric Plasma 5 8 11 14 17 20 23 26 29 32 Conventional Surface treatment Thermo-Chemical Surface Tratment (ORNL) Atmospheric Plasma (ORNL) AtomicOxygenConcentration(%) PLASMA RESULTS  Triples the oxygen concentration on the carbon fiber surface as compared to Electrochemical industrial practice Conventional Thermochemical Plasma Surface Treatment Method

6. Plasma Surface Treatment – Chemical Flexibility Polyurethanes, nylons, polyesters Nylons Vinyl Esters

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