摘要：

Process optimization of poly(butylenes adipate) glycol(PBAG) with trace yttrium trifluoromethanesulfonate(Y(OTf)_3) as catalyst by step-heating below 220 ℃ was studied. The infl uence of types and amount of catalyst,monomer mole ratio,reaction temperature and reaction time on intrinsic viscosity were discussed. Structure of the product was characterized by FTIR and 1H NMR. Thermal behavior of the product was studied by DSC,TG and DTG. Results showed that the intrinsic viscosity of the product was 0.221 9 d L/g when n(1,4-butanediol,BDO)︰n(acrylic acid,AA) 1.5 and the usage of Y(OTf) 3 was 0.012 5%(based on AA moles) by step-heating in 120-180 ℃ for 10 h. Melting point of PBAG was 54.5 ℃,and crystallization point was 28.7 ℃. The initial thermal decomposition temperature of PBAG was 316.2 ℃,and fi fty-percent weight-loss temperature was 456.2 ℃.

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