Modification of poly(phenylquinoxaline) through solution

It was established that the physical modification of poly(phenylquinoxaline ) through solution can be achieved by optimizing the composition of a mixed solvent or by introducing small amounts of a second polymer, for example, polycarbonate. The latter method yields transparent films; however, as evid enced by dielectric spectrometry, the resulting composition is two-phase. O n the basis of calorimetry and viscometry data, it is suggested that the en hanced strength of films made of modified poly(phenylquinoxaline) is explai ned by the cosolubility effect when the polymer is modified according to th e first method, while in the second case, this phenomenon is attributed to appearance of interpolymer interactions.