Abstract:
In this experimental study the wetting behavior of unsized and carbon nanotube (CNT) grafted carbon
fibers is assessed with various polymers. Thermoset epoxy and two thermoplastics (polypropylene and
polycarbonate) are tested. Sessile drop method and drop-on-fiber method are employed to quantify
the wettability of various fiber/polymer combinations. Contact angle measurements based on the above
two methods give insights into the effectiveness of various polymers to wet different types of carbon fiber
fabrics and single fiber filaments. Moreover, the effect of CNT length and density on the wettability of carbon fibers is ascertained by synthesizing nanotubes on the fiber surface for varying time durations (10–
30 min). CNT grafting reduces the contact angle of the polymer drop with carbon fiber; however, too
much growth of nanotubes on the fiber surface leads to improper impregnation of the polymer into
the carbon fabric. While polypropylene shows better wetting characteristics with unsized and CNT
grafted carbon fibers, polycarbonate shows poor wettability.
