Benzocyclobutene-containing polyesterimide, thermocuring material and preparation methods of benzocyclobutene-containing polyesterimide and thermocuring material

The invention relates to polyesterimide containing a benzocyclobutene structure. The structural formula of the polyesterimide is as follows: # imgabs0 # n is 12-48; r is as follows: # imgabs1 # X is 0.22 to 0.44, Y is 0.29 to 0.51, and 1-X-Y is 0.27; or the number X of the # imgabs2 is 0.20 to 0.44, the number Y of the # imgabs2 is 0.29 to 0.60, and the number 1-X-Y of the # imgabs2 is 0.20 to 0.27. According to the present invention, the large-volume distorted imide structure is included, the introduction of the imide structure can effectively increase the glass transition temperature, and the benzocyclobutene active end group is introduced so as to effectively reduce the molecular weight of the polyester imide and reduce the melting processing temperature of the polyester imide; and a heat-curing material of polyesterimide containing a benzocyclobutene structure can be directly formed through hot ring-opening addition polymerization, the environment-friendly effect is achieved, and small molecules are not g