A comparative analysis of phase separation in block copolymers and in mixtures of polyarylate and polyethylene oxide

Phase separation and glass transition point versus composition diagrams of binary mixtures with covalent bond between components

“…We compared the predicted GTD with the experimentally measured GTD of PA-PEO block-polymer [16] and polyarylene-sulfone oxide -PEO blockpolymer [20]. In the experimental GTD one can dearly see three distinct regions: .3Cj Mass frclclion I"1 ~0 Fig.…”

“…9. The experimental transition temperature versus composition curve of the PA-PEO mixture with variable MM of PEO and MM of PA equal to 5000 plotted from the DSC data [1,16] (melting curve is not given). Black circles are glass transition points, light circles are clearing points, black triangles are glass transition points of a single-phase system calculated by equation (5), light triangles are experimental glass transition points for two compositions after a long exposure to above the cloud point followed by annealing.…”

“…Futher, with such a composition the amount of the PA-rich phase is large enough to enable its reliable experimental identification according to the jump of heat capacity during glass transition, because in pure PA such a jump is small (0.043 J/g K). Note that even though homo-PEO is crystallizable no crystal phase has been found in this block-polymer at x = 0.29 [16].…”

“…3,1). The most probable reason is the beginlves rise either to large concen~inodal decomposition) or large K for PEO) and, besides, at room temperature its composition is confined within the two-phase range near the phase separation limit [16]. Since the phase separation boundary is near and since the clearing point of the corresponding mixture is 420 K [1] one would expect that in this block-polymer the mixing temperature is not higher than the glass transition point of PA (Tg 1).…”

“…The test samples were block-polymer films obtained by slow evaporation from chloroform solution [16]. Residual solvent was figure 3.…”