High-Temperature Thermoplastics Polyurethanes for Cable Jacketing Applications

摘要

Every polymer has its own thermal aging characteristic depending upon chemistry of the polymer and additives incorporated into the product. Generally, a polymer ages by gradual loss of its ultimate elongation. For wire and cable applications, it is commonly considered that a minimum 50% ultimate elongation of sheathing material is necessary to ensure cable functions without cracking. Many flexible jacketing polymers obtain flexibility by addition of plasticizers and/or oils. Specific examples include flexible PVCs and some TPEs. Upon thermal aging, these compounds gain tensile strength by loss of oil/plasticizer. However, their ultimate elongation reduces because they become brittle by loss of plasticizing additives.