Phase equilibrium in the diglycidyl ether of bisphenol A - Hydroxyl-terminated oligobutadiene derivatives systems

The phase equilibrium in the binary systems based on hydroxyl-terminated bu tadienes and diglycidyl ether of bisphenol A has been studied in wide range s of temperature and compositions of the solution. The analysis of the obta ined experimental and calculated data shows that the molecular weight, cont ent of hydroxyl groups, functionality of the oligomer, and the presence of bromine in the oligomer affect the level of the thermodynamic compatibility . An increase in the content of hydroxyl groups and bromine results in an i ncrease in the compatibility of the components. The results obtained are in terpreted in terms of the Flory-Huggins theory. The correlation between the phase boundary concentrations and an upper critical solution temperature a nd solubility parameters of the oligobutadienes has been established. (C) 1 999 John Wiley & Sons, Inc.