Matrix-Assisted Laser Desorption/Ionization Mass Spectrometric Study of the Oligomers Formed from Lactic Acid and Diphenylmethane Diisocyanate
journal contributionposted on 12.09.2001, 00:00 by Sándor Kéki, Ildikó Bodnár, Jenő Borda, György Deák, Gyula Batta, Miklós Zsuga
The reaction between lactic acid and diphenylmethane diisocyanate was studied by 1H NMR, 13C NMR, and matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy. The structure of the oligomers formed was also investigated and supported by using the postsource decay method. Analysis of the products revealed that, besides linear chain copolymer formation, branching and homooligomerization of lactic acid also took place. A mechanism is suggested for the cooligomerization processes.