Abstract
Carbon 9 (C9) resin is a major by‐product of the petrochemical industry and is rich in unsaturated hydrocarbons. By copolymerization with maleic anhydride (MAH), the product MAH‐C9 was used as a carbon foaming agent. Combining MAH‐C9 with ammonium polyphosphate (APP), which served as an acid and a gas source, an intumescent flame‐retardant system was introduced into thermoplastic polyurethane (TPU). Flammability evaluation indicated that 4.5 wt% APP and 0.5 wt% MAH‐C9 helped TPU achieve the maximal limiting oxygen index value of 25.9%, passing UL‐94 V‐0 rating. Total smoke release was decreased from 1,884.4 m2/m2 for neat TPU to 833.0 m2/m2 and char formation was promoted. The mechanical loss brought by 5 wt% APP was a little recovered by 4.5 wt% APP/0.5 wt% MAH‐C9. POLYM. ENG. SCI., 60:1029–1034, 2020. © 2020 Society of Plastics Engineers
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