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Materials with lower dielectric loss and greater thermal and mechanical properties have drawn public attention with the rapid development of 5G technology. However, the mastery and understanding of the aging mechanism and working lifetime of these specific materials remain an open challenge. Here, we designed a glass fiber (GF)-reinforced acrylate–styrene–acrylonitrile/polycarbonate (ASA/GF/PC) composite and systematically investigated its aging behavior, aging mechanism, and lifetime prediction under long-term thermal and oxidative conditions. The aging behaviors regarding the mechanical, dielectric properties and color change were deeply analyzed at four aging temperatures. Results indicated that impact strength was applicable to estimate working lifetime. Assisted by general Arrhenius kinetic models, the predicted lifetimes were 22,334 days at 303 K, 8605 days at 313 K, 3517 days at 323 K, and 1516 days at 333 K, respectively. The study of aging mechanism confirmed that thermal degradation inevitably occurred in the ASA and PC phases, which provoked the appearance of newborn oxygen-containing groups and further induced the generation of cross-linked domains. The desired results provide a valuable reference to guide the widespread and long-term utilization of ASA/GF/PC composites in 5G technology. [ABSTRACT FROM AUTHOR]

The development of fifth‐generation technology has resulted in increased demand for materials with low dielectric losses and superior thermal and mechanical properties. However, ensuring the widespread use of such materials by investigating their aging mechanisms and operating lifetimes remains challenging. In this study, a glass‐fiber (GF)‐reinforced acrylate‐styrene‐acrylonitrile/polycarbonate (ASA/GF/PC) composite is designed and comprehensively investigated its aging behavior, mechanism, and service lifetime under long‐term hygrothermal conditions. Based on the general Peck model, the composite maintains a high level of quality for over 10 years, including under harsh conditions of 40 °C and 80% relative humidity. The aging mechanism is primarily ascribed to cracking between the GF fibers and matrix, the breaking of chemical bonds, the generation of new cross‐linked domains, and physical aging. These findings provide valuable insights into the long‐term utilization of ASA/GF/PC composites in harsh environments. [ABSTRACT FROM AUTHOR]