Low dielectric constant polymer containing dinaphthyl and hexafluorocyclobutyl ether unit, preparation method and use

A process of preparing a polymer containing dinaphthyl hexafluorocyclobutyl ether units, comprising:

• in an organic solvent and in the presence of a ferric salt, conducting an oxidative polymerization reaction using binaphthol-hexafluorocyclobutyl ether as a raw material, thereby producing the polymer;
• wherein the binaphthol-hexafluorocyclobutyl ether has the following structure:
• and
• the polymer containing dinaphthyl hexafluorocyclobutyl ether units has the following chemical structure:
• where n=5 to 200.

A preparation method of a compound of formula A, comprising:

• (1) in the presence of potassium carbonate or potassium hydroxide and in N-methylpyrrolidone or DMSO solvent, reacting 1-naphthol and tetrafluorodibromoethane at room temperature for 10 to 20 hours, thereby forming 1-naphthyl-bromotetrafluoroethane ether, the molar ratio between 1-naphthol and tetrafluorodibromoethane being 1:1-10;
• (2) in refluxing acetonitrile and in the presence of zinc, conducting an elimination reaction of the 1-naphthyl-bromotrifluoroethane ether for 5 to 20 hours, thereby forming 1-naphthyl-trifluorovinyl ether, the molar ratio of 1-naphthyl-bromotrifluoroethane ether and zinc being 1:1-5;
• (3) at a high temperature of 150 to 250° C., conducting a [2+2] cyclization reaction of the 1-naphthyl-trifluorovinyl ether for 5 to 15 hours, thereby forming binaphthol-hexafluorocyclobutyl ether,
• wherein the compound of formula A is represented by