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Citation: LUO Yu-Mei, SUN Xu-Bing, LIANG Bing. Synthesis of Polyester Diol under Mild Conditions Catalyzed by Sc(OTf)₃[J]. Chinese Journal of Applied Chemistry, ;2008, 25(8): 948-951. shu

Synthesis of Polyester Diol under Mild Conditions Catalyzed by Sc(OTf)₃

1.
State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065

Corresponding author: LIANG Bing,
Received Date: 7 August 2007
Available Online: 1 November 2007

Esterification of adipic acid with 1,4-butanediol was carried out in the presence of scandium trifluoromethanesulfonate [Sc(OTf)₃] as a Lewis acid catalyst under mild conditions. The effects of reaction temperature, catalyst dosage, and synthesis method on the esterification and the polycondensation were investigated. The product was characterized by FT-IR, ¹H NMR and GPC. Under the optimum conditions of 90℃, Sc(OTf)₃ 0.1%, molar ratio of 1,4-butanediol to adipic acid 1.1:1, reflux time 11 h, the percent of esterification was 93% without removing water, over 99% with water removed. The esterification and the polycondensation were both slow without removing water. With water removed, the reaction rate was improved greatly. The molecular mass also increased, and the molecular mass distribution became narrow. FT-IR and ¹H NMR indicated that there was no by-product.
- Scandium trifluoromethanesulfonate,
- low temperature,
- esterification,
- polyester diol
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Synthesis of Polyester Diol under Mild Conditions Catalyzed by Sc(OTf)₃