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Quantitative prediction of irradiation aging rate in silica-filled silicone rubber composites: The decisive role of filler content and linear attenuation coefficient
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DOI：10.1016/j.polymdegradstab.2026.112368.png)
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Abstract
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• For the first time, a quantitative model is established to predict the irradiation aging rate of silica-filled silicone rubber composites by correlating filler content with the difference in linear attenuation coefficients between silica and the rubber matrix, demonstrating that higher filler loading accelerates aging by increasing the total radiation energy absorbed by the material. • The study reveals that irradiation drives the crosslink density distribution of the composite to evolve from a unimodal to a bimodal pattern via simultaneous scission of the original network and formation of a denser new network, with total crosslink density increasing linearly with absorbed dose while interfacial interaction strength follows an exponential saturation growth pattern. • It is clarified that the higher linear attenuation coefficient of silica enables it to absorb more radiation energy and deposit it locally at the filler-matrix interface, leading to a significantly higher degree of polymer aging in the interfacial region compared to the bulk matrix, with the interfacial physical adsorption strength rising rapidly before gradually plateauing as the dose increases.
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