Abstract
Polyketone fiber is considered as a reinforcement of the mechanical rubber goods (MRG) such as tires, automobile hoses, and belts because of its high strength and modulus. In order to apply it to those purposes, the high adhesion of fiber/rubber interface and good sustainability to aging conditions are very important. In this study, polyketone fiber reinforced natural rubber composites were prepared and they were subjected to thermal and humidity aging, to assess the changes of the interfacial adhesion and material properties. Also, the effect of adhesive primer treatment, based on the resorcinol formaldehyde resin and latex (RFL), of polyketone fiber for high interfacial adhesion was evaluated. Morphological and property changes of the rubber composites were analyzed by using various instrumental analyses. As a result, the rubber composite was aged largely by thermal aging at high temperature rather than humidity aging condition. Interfacial adhesion of the polyketone/NR composites was improved by the primer treatment and its effect was maintained in aging conditions.
Highlights
As general reinforcements of rubber composites, rayon, nylon, and polyester fibers have been used for a long time due to their reasonable performance and usefulness
The effects of thermal and humidity aging on the characteristics of the polyketone fiber reinforced natural rubber composite were investigated and analyzed in accordance with the primer coating of fiber
Oxidation of the natural rubber (NR) matrix by thermal aging caused cracked and roughened morphologies and it brought the decrease of the interfacial strength of the composites
Summary
As general reinforcements of rubber composites, rayon, nylon, and polyester fibers have been used for a long time due to their reasonable performance and usefulness. The cost of its raw material is cheap and the spinning process is environmentally friendly It has the additional benefits of similar tenacity and modulus to para-aramid and has higher breaking elongation and good adhesion property with a rubber matrix. The rubber composites are aged by surrounding temperature, humidity, or other factors in actual use environments and, if aging is conducted, physical properties of the rubber itself are degraded and the interfacial adhesion between reinforcement and rubber are changed more or less. The temperature and humid condition has a major effect on the aging of the tire rubber. The effects of aging condition on the interfacial properties of the polyketone fiber reinforced natural rubber composite were investigated. Variations of the rubber hardness, interfacial strength, chemical composition of the rubber matrix, and so forth according to the aging conditions were measured and analyzed as well as their morphological changes
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