Rapid Ring‐Opening Polymerization of D,L‐Lactide by Microwaves

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Abstract
Summary: Poly(D,L‐lactide) with a molar mass of 105 g · mol−1 and a yield over 90% was produced in 10 min by the ring‐opening polymerization of D,L‐lactide under microwave irradiation with forward power of 255 W. A degradation of the poly(D,L‐lactide) was also induced by microwaves with a power level over 340 W. The molar mass of poly(D,L‐lactide) was dependent upon the competition between the polymerization of D,L‐lactide and the degradation of the resulting polymer. Profiles of molar mass versus microwave irradiation time (1.8 g DLLA, 0.1% Sn(Oct)2). magnified image Profiles of molar mass versus microwave irradiation time (1.8 g DLLA, 0.1% Sn(Oct)2).