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D,L‐Lactide with a yield of about 36% was synthesized from D,L‐lactic acid by the addition of SnCl2 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−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. magnified image
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Zhang et al. (2007) studied this question.
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