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Experimental analysis reveals broad carbon fiber dispersion enhances microwave absorption in polyurethane films, indicating effective conductive network formation.
Composite films of PAN-derived carbon fibers (CFs) with different particle-length distributions incorporated into a polyurethane (PU) matrix were investigated. Increasing CF dispersity strongly affected filler distribution and structure, suggesting the formation of conductive networks within the PU matrix. FTIR ATR spectra revealed a progressive decrease in hydrogen-bonded carbonyl groups with increasing CF dispersity, indicating weakened intermolecular interactions in the PU phase. TGA showed that all PU–CF composites retained their thermal stability. The sample containing CFs with a broad length distribution (10–90 µm) exhibited the lowest microwave transmission (12–15%) and demonstrated moderate reflection (31–40%) together with substantial absorption (38–46%).
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Diyuk et al. (2026) studied this question.
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