Melt transesterification of bisphenol acetophenone–polycarbonate: A kinetic study

Abstract

This article deals with the development of kinetic parameters for bisphenol acetophenone-polycarbonate made by melt transesterification with diphenyl carbonate. The understanding of the influence of borosilicate glass of the reactor construction materials on the accuracy of the kinetic data is reported. During the development of analytical methods, the use of high performance liquid chromatography-mass spectrometry (HPLC-MS) was proven to be a valid tool to determine the oligomers existing in the reaction mixture. Accurate kinetics parameters were obtained by elimination of the interference of the construction materials.We provide the rate expressions, kinetic parameters [forward reaction frequency factor ¼ 2.456 Â 10 13 6 0.01 (cm 3 / mol) 2 /min, forward reaction activation energy ¼ 45.69 6 0.2 kJ/mol, reverse reaction frequency factor ¼ 2.068 Â 10 14 6 0.01 (cm 3 /mol) 2 /min, and reverse reaction activation energy ¼ 56.37 6 0.1 kJ/mol], and equilibrium constants at various temperatures.

Experimental study of the influence of raw material impurities on yellowness index of transesterification polycarbonate

“…Polymerizations were carried out in 75 mL quartz reactors. Prior experience had shown that there is indeed significant “uncatalysed” reaction in standard borosilicate glass flask due to the presence of trace levels of sodium on the surface 7. It was also found that switching to quartz reactors the catalytic effect of the reactor surface can be significantly reduced.…”