Jr. Isasi et al., MISCIBILITY AND SPECIFIC INTERACTIONS IN BLENDS OF POLY(2-ETHYL-2-OXAZOLINE) WITH HYDROXYLATED POLYMETHACRYLATES, Macromolecular chemistry and physics, 197(2), 1996, pp. 641-649
The compatibility of blends of poly(2-ethyl-2-oxazoline) (PEOX) with p
oly(2-hydroxy-ethyl methacrylate) (PHEMA) and poly(2-hydroxypropyl met
hacrylate) (PHPMA) was investigated by means of differential thermal a
nalysis and infrared spectroscopy. Calorimetric results show single gl
ass transition temperatures in the entire range of compositions for bo
th systems. S-shaped curves are obtained when plotting the glass trans
ition temperatures vs. blend compositions. IR analysis of blends revea
ls the existence of specific interactions via hydrogen bonding between
the carbonyl and hydroxyl groups of PHEMA and PHPMA. The association
phenomena were quantitatively studied from room temperature up to 180
degrees C with the aid of spectral subtraction techniques.