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Microwave Irradiation: A Novel Method for Rapid Synthesis of D,L-Lactide

✍ Scribed by Ying Min Zhang; Peng Wang; Ning Han; Hai Fen Lei

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
131 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

D,L‐Lactide with a yield of about 36% was synthesized from D,L‐lactic acid by the addition of SnCl~2~ and Cat‐A as catalyst under continuous microwave irradiation in less than 1 h. In order to gain a higher yield, the viscosity‐average molecular weight of the oligomer was preferably over 3 000 g · mol^βˆ’1^, and the microwave power in the depolymerization process was chosen for 200 W with 100 g of D,L‐lactic acid. On comparison with conventional heating in the same experimental conditions, no non‐thermal effect of microwave irradiation was revealed.

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