Abstract Poly( m ‐phenylenediamineisophthal)amide (MPD‐I) and poly( p ‐phenylenediamineterephthal)amide (PPD‐T) are among the most important high‐tech polymers. The degradation of three MPD‐I fibers with different molecular weight distributions and a PPD‐T fiber was studied in a proprietary laborato...
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