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The effects of thermal cycling on a polymerized monomeric reactant (PMR) type polyimide (TriA X) reinforced with carbon fibers were investigated. Composite specimens were subjected to 2000 thermal cycles between ?54C and 232C. At 400-cycle intervals, laminates were inspected for microcracks, and glass transition temperature (Tg) and short-beam shear (SBS) strength were measured. The composites did not exhibit microcracks after thermal cycling, although after 2000 thermal cycles, mechanical properties of the matrix declined slightly. The matrix degradation decreased the resistance to microcracking upon further loading. No effects of thermal oxidative aging were observed from thermal cycling, and thermally driven fatigue and creep were identified as the primary and secondary factors inducing mechanical degradation of the matrix. Tg of the composites exhibited no change after 2000 cycles, while the SBS strength decreased slightly (3?9%). The results highlight the potential for use of TriA X composites as long-term structural components in high-temperature service environments.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2987O – PubChem