Biphenyl polyether sulfone resin containing methoxy biphenyl ether group and synthesis method and application thereof

The invention discloses biphenyl polyether sulfone resin containing methoxy biphenyl ether group, a synthesis method and application thereof, wherein the structural formula of the resin is as follows: wherein R is 1 ，R 2 ，R 3 Each independently represents H and-OCH 3 And R is 1 ，R 2 ，R 3 Two of them are simultaneously H, and the other one is-OCH 3 (ii) a n = 2-2000. The synthesis method comprises the following steps: 4, 4' -dihydroxybiphenyl, component B: 4, 4' -dichlorodiphenyl sulfone, component C: the method is characterized in that methoxy biphenyl metal phenolate is used as a reaction monomer, sulfolane is used as a solvent, alkali metal carbonate is used as a salt forming agent, and solution polymerization technology is adopted for polymerization. According to the invention, a methoxyl biphenyl metal phenolate monomer is introduced into a PPSU polymer as an end capping agent, so that the prepared biphenyl polyether sulfone resin containing methoxyl biphenyl ether groups has the chlorine content of less than 900ppm, the light transmittance of more than 83%, the haze of less than 3% and the yellowness index of less than 15, and has the characteristics of remarkably improved transparency and color level, long-term high temperature resistance and no discoloration.