Propagation in the two-step solution copolycondensation with p-xylyleneglycol and bisphenols with the TsCl/DMF/Py condensing agent

A two-stage solution copolycondensation of IPA/TPA (50/50), ineffective aliphatic p-xylyleneglycol (PXG), and effective bisphenols (BPs) using tosyl chloride/dimethylformamide/pyridine condensing agent was studied by examining factors, such as, kinds of BPs, reaction temperature, and the order of addition of PXG and BPs. Better results were obtained by initial reaction of PXG followed by BPs at a lower temperature (80 °C). BPs, when reacted randomly with the preformed oligomers from PXG, gave better results. These results were discussed in terms of the reaction of the preformed oligomers with PXG or BPs by measuring the distributions of growing oligomers by GPC and of PXG or BPs in the copolymers by 1H NMR.