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Poly(arylene ether nitrile) (PEN) end‐capped with phthalonitrile (PEN‐n) was synthesized by incorporating phthalonitrile into the terminals of PEN. The as‐prepared flexible PEN‐n (after elevated temperature treatment) was characterized by infrared spectroscopy, nuclear magnetic resonance, gel permeation chromatography, and rheological measurements. In addition, the effects of curing behaviors on properties...
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