Nylon 66 short fiber reinforcement in EPDM power transmission belting: A path to enhanced mechanical performance

Abstract

AbstractV‐belts are commonly used to transmit power between two distant pulleys. Therefore, a strong reinforcement for dimensional stability and thermomechanical properties are essential in power transmission belts. The influence of resorcinol formaldehyde resin (RFL) treated nylon short fibers in EPDM peroxide‐cured formulations was investigated, with concentrations ranging from 0 to 30 parts per hundred rubber (phr) in increments of five. The incorporation of nylon short fibers resulted in improved tensile and mechanical properties in EPDM vulcanizates. Specifically, the tensile stress at 100% elongation increased by 177% to (10.8 MPa), and the improvement in tear strength to 16.2% (75.7 N/mm) was observed. Among other functional requirements in a weak rubber like EPDM, enhanced tear strength is significant for its application in power transmission. Substantial reinforcement between the fiber‐elastomer matrix was confirmed via scanning electron microscopy, as evidenced by increased storage modulus (E′). Notably, there were no considerable effects on the curing rate or low‐temperature properties. Significant improvement in heat stability is observed through thermogravimetric analysis. These enhancements in mechanical and thermal properties might play a role in increased durability and performance in actual V‐ribbed belt applications.Highlights This manuscript describes the effect of treated nylon 66 short fiber on EPDM V‐belt compound. A significant increase in storage modulus, tear strength, and thermal stability. A belt is made using the experimental formulation and it meets the performance requirement. Low fiber content (<15 phr) compounds are unsuitable for dimensional stability. High fiber content (>25 phr) compounds pose processing challenges.