Влияние мощности облучения на поликонденсацию молочной кислоты в условиях микроволнового синтеза

Abstract

Work is devoted to studying the effect of the irradiation power of lactic acid polycondensing (LA) undermicrowave irradiation (MI). The change of temperature LA sample under the influence of MI. It is found thatwith increasing MI power of 130 to 280W LA temperature was raised to 10 - 15°C, and at 280, 360, 500W isalmost identical temperature of the samples and is 215°C. The process was carried out in a polycondensation LAmultimodal reactor under vacuum by bubbling nitrogen at a power of 80, 130, 280, 360 and 500 watts. Based on1H NMR data and IR suggested that the 80 W mostly removed physically bound water molecules. At a power of130 - 280 W, together with removal of water and MC MK polycondensation processes occur. LApolycondensation proceeds most effectively at 360 watts. That is, the condensation process depends not only ontemperature but primarily power MI. The findings confirm the presence of "microwave effect" when the LApolycondensation under MI. It is shown that the presence of α-alanine in the reaction is two times faster than inthe case of β-alanine.