The enthalpies of melting for PENK20-280, PENK25-280, and PENK30-280 in the DSC curves were 1.14 J/g, 2.64 J/g, and 5.03 J/g, showing an increasing trend.
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Synthesis and Properties of Semicrystalline Poly(ether nitrile ketone) Copolymers.
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