Positive Temperature Coefficient Heating Material With Novel Low Curie Temperature and Low Room-Temperature Resistivity

ABSTRACTPositive temperature coefficient (PTC) composites with self‐regulating heating properties are vital for electronic devices requiring thermal protection. This study synthesized a novel PTC composite by embedding 9 vol% spheroidal graphite (SG) into a solution‐cast blend of low‐density polyethylene and palmitic acid (PA) at a 1:3 volume ratio, achieving a Curie temperature of 56°C to prevent overheating. The composite demonstrated low room‐temperature resistivity of 798 Ω cm and high PTC intensity of 6.1, with stable performance over 30 thermal cycles. The robust LDPE matrix effectively eliminated negative temperature coefficient effects. Additionally, the material exhibited precise self‐regulating temperature control, maintaining temperatures near 56°C under varying voltages and retaining stability after 10 heating cycles. These properties, including low resistivity, high reproducibility, and durable thermal regulation, highlight its potential for applications demanding overheating protection and consistent thermal management.