Sulfonic acid dual-core ion liquid catalyst and method using same for synthesizing polydiethylene glycol sebacate

The invention relates to a sulfonic acid dual-core ion liquid catalyst and a method using the same for synthesizing polydiethylene glycol sebacate. The structure of the catalyst is shown in the specification, wherein R is CH2CH2CH2 or CH2CH2CH2CH2, and n is equal to 2-8. In the invention, sulfonic acid dual-core ion liquid catalyst is utilized to synthesize the polydiethylene glycol sebacate, therefore, the problems that in the prior art, PBS molecular weight is not high, the color phase is poor and the like are solved. By utilizing the catalyst, the molecular weight of the polydiethylene glycol sebacate obtained by catalytic catalysis is high, the viscosity-average molecular weight can reach 1.0*10 -1.5*10 , the breaking strength reaches 35-55MPa, and the breaking elongation is 200%-420%. In the invention, the viscosity-average molecular weight of the PBS is improved greatly; therefore, the application value of the catalyst is improved.