Moisture effects on isobutylene‐isoprene copolymer‐based composite barrier. I: Moisture diffusion and detection

摘要: Experiments have assessed how moisture and heat influence the functional structural integrity of butyl rubber matrix composites used as protective barriers. This paper, which is first a series, reports findings on subjects diffusion its effect ultrasonic wave propagation composite On exposure to high humidity at elevated temperatures, carbon black-reinforced barriers were found absorb substantial moisture, with hygroscopic reinforcement phase making more significant contribution than matrix. The coefficients for both unreinforced vulcanizate close each other temperature, had same temperature dependence. calculated activation energies indicate that absorption rate black governed by Ultrasonic speed appeared be viable means monitoring moist heat, relative speeds decreased continuously.