乙酸氧钛催化酯化缩聚法合成聚丁二酸乙二醇酯及其性能研究OACSTPCD

As an aliphatic polyester,poly(ethylene succinate)(PES)has good mechanical properties and full biodegradability,which has broad application prospects in the field of degradable plastics.Titanyl acetate was prepared by solvothermal method and used as a catalyst to catalyze the esterification and polycondensation of succinic acid(SA)and ethylene glycol(EG)to synthesize high molecular weight PES.The effects of catalyst dosage(the mass fraction of catalyst in the reaction material,the same below),reaction temperature and reaction time on the molecular weight of PES were investigated.The structures of PES were characterized by 1H-NMR and 13C-NMR,and its thermal properties,thermal stability and mechanical properties were tested.The results show that the intrinsic viscosity coefficient[η]of the synthesized PES is 0.78,the number average molecular weight(Mn)is 47500,and the corresponding polymer dispersion index(PDI)is 2.66 when the catalyst dosage is 0.6％and the polymerization is carried out at 230 ℃ for 8 h.The melting point temperature of PES is 102.4 ℃,the maximum thermal decomposition temperature is 420.2 ℃,the elongation at break is 505％±5％,the tensile stress is(48.3±0.6)MPa,and the tensile elastic modulus is as high as 358.8 MPa.The synthesis of PES using coal-to-ethylene glycol as a monomer can not only achieve low-cost preparation of fully biodegradable polymers,but also has important practical significance for the high-quality development of the coal chemical industry.