Carbonate-containing oligomer, manufacturing method thereof, and crosslinked product

A manufacturing method for a carbonate-containing oligomer, comprising:

• performing a mixing step, wherein a purified bifunctional epoxy resin represented by formula (i) is mixed with a carbonate-containing compound represented by formula (ii), and a first mixture is obtained by heating to a first temperature to accelerate a dissolution:
• performing a first active transesterification step, wherein a catalyst is added to the first mixture and maintained at the first temperature to react, so as to obtain a second mixture;
• performing a dilution mixing step, wherein an aromatic ring solvent and a methacrylic acid active ester represented by formula (iii) are added to the second mixture and mixed to obtain a third mixture:
• performing a second active transesterification step, wherein the third mixture is heated to a second temperature and maintained at the second temperature to react, so as to obtain a fourth mixture;
• and
• performing a filtering step, wherein the fourth mixture is cooled and filtered to obtain the carbonate-containing oligomer represented by formula (I):
• wherein R1, R2 and X are each independently an aromatic ring group, and n is an integer from 1 to 5.