Mechanical and Tribological Properties of Polytetrafluoroethylene Composites with Carbon Fiber and Layered Silicate Fillers

Abstract

Mixtures of layered silicates (vermiculite and kaolinite) and carbon fibers were investigated as filler materials for polytetrafluoroethylene. The supramolecular structure and the tribological and mechanical properties of the resulting polymer composite materials were evaluated. The yield strength and compressive strength of the polymer increased by 55% and 60%, respectively, when a mixed filler was used, which was attributed to supramolecular reinforcement of the composites. In addition, the wear resistance increased by 850 times when using vermiculite/kaolinite fillers, which was due to protection of the surface by the formation of hard tribofilms.

Mechanical Behavior and Morphological Study of Polytetrafluoroethylene (PTFE) Composites under Static and Cyclic Loading Condition

“…Due to the low cohesion of the fiberglass-matrix interface, these regions will be favored for nucleation of cracks during their deformation. The formation of dendritic structures (bridges) has also been observed in the literature for fibrous fillers such as glass fiber or carbon fiber [ 11 ]. The authors emphasize that the interactions between the polymer and the fiber took place locally, which confirms the very difficult interaction of PTFE with other materials.…”

“…The highest increase in the modulus of elasticity was observed in composites with the addition of 5 wt.% aramid fibers, which was 1.8 times higher than in the case of unmodified PTFE. In another work, Vasiliev et al described the influence of the low content of carbon fibers (1–5 wt.%) on the tribological and mechanical properties of composites [ 11 ]. Additionally, 1 wt.% kaolin was added to each composition.…”

Tribological Behavior of Hydraulic Cylinder Coaxial Sealing Systems Made from PTFE and PTFE Compounds

“…These limitations can be minimized by adding suitable fillers to a PTFE matrix to produce PTFE-based composites that are suitable for use as the friction units of technical equipment. The most common fillers used with PTFE are glass fiber, carbon fiber (CF), graphite, copper particle, molybdenum disulfide (Mo 2 S), and mixtures of these [15]. Fillers, such as bronze, glass fiber, Mo 2 S or carbon, added into the composition of PTFE influence seal behavior in different ways.…”

Biomimetic catechol-based adhesive polymers for dispersion of polytetrafluoroethylene (PTFE) nanoparticles in an aqueous medium

“…Many of the above-mentioned approaches require complicated processes and specially made instruments. To date, there has been a large number of polymer materials which could disperse extremely hydrophobic and poorly adhesive PTFE [22][23][24] in organic solvents, however, PTFE dispersion in an aqueous medium without using uorinated surfactants or additional uorinated reagents remains a challenging scope. Inspired from the reducing properties of catechol moieties, the composite materials prepared by coating PTFE particles in nm range coated with amphiphilic polymers containing catechol moieties can be exploited as nanosized reactors that can automatically reduce metal ions.…”