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Fast Microwave‐Mediated Bulk Polycondensation of d,l ‐Lactic Acid
Author(s) -
Kéki Sándor,
Bodnár Ildikó,
Borda Jenö,
Deák György,
Zsuga Miklós
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20010901)22:13<1063::aid-marc1063>3.0.co;2-3
Subject(s) - condensation polymer , lactic acid , oligomer , microwave , mass spectrometry , irradiation , materials science , microwave irradiation , matrix assisted laser desorption/ionization , polymer chemistry , desorption , chemistry , nuclear chemistry , analytical chemistry (journal) , polymer , organic chemistry , catalysis , chromatography , physics , quantum mechanics , adsorption , biology , bacteria , nuclear physics , genetics
The polycondensation of D , L ‐lactic acid upon microwave irradiation was studied. The results of polycondensation by means of microwave were compared to those obtained from conventional heating of lactic acid at 100°C, and it was found that the reaction proceeds with much higher rate upon microwave irradiation. The oligomer mixtures formed were investigated by means of matrix‐assisted laser desorption/ionization mass spectrometry (MALDI MS). The molecular mass of the poly(lactic acid) formed under microwave irradiation was found to increase with irradiation time, and the formation of cyclic oligomers after 20 min of reaction time was also revealed.