Abstract Developing high‐performance polymer (HPP) with improved properties by green processing method is one of the core parts of HPP research. In this paper, a new monomer (4,4′‐((propane‐2,2‐diylbis(4,1‐phenylene))bis(oxy))dibenzaldehyde (PBhDCI)) of high‐performance aromatic nitrile‐based (AN) resins with good solubility in ethanol was designed. The rheological analysis showed that PBhDCI is suitable for the processing by laminating process. The cured resins and the corresponding carbon fiber reinforced plastics (CFRP) showed outstanding thermal and mechanical properties. The thermal decomposition temperature (T5) of the cured PBhDCI under nitrogen up to 510°C, the glass transition temperature (Tg) of both resin matrix and CFRP exceeds 500°C, and the flexural strength and modulus of CFRP were 507 ± 5 MPa and 59 ± 2 GPa. This work will offer some guidance for the preparation of high‐performance resins and corresponding CFRP with a green processing and high thermal and mechanical properties.
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