Lc. Cesteros et al., MISCIBILITY AND SPECIFIC INTERACTIONS IN BLENDS OF POLY(HYDROXY METHACRYLATES) WITH POLY(VINYLPYRIDINES), Macromolecules, 26(9), 1993, pp. 2323-2330
Poly(4-vinylpyridine) and poly(2-vinylpyridine) were found to be misci
ble with poly(2-hydroxyethyl methacrylate) and poly(3-hydroxypropyl me
thacrylate). This miscibility is proved by calorimetric studies in con
junction with infrared analysis of the blends. All blends show a singl
e glass transition which is of a higher value than the glass transitio
ns of the blends calculated on the basis of additive behavior. Further
more, the variation of the glass transitions of the blends follows the
Jenckel-Heusch equation. Infrared studies show that carbonyl, hydroxy
l, and pyridine ring peaks undergo important changes which were attrib
uted to hydrogen bonding between the hydroxyl groups in both methacryl
ates and the basic nitrogen atom present within the pyridine ring. The
se interactions were observed to be of greater relevance for poly(4-vi
nylpyridine) than for poly(2-vinylpyridine). Finally, phase transition
s were also studied. No phase separation was found for blends having p
oly(4-vinylpyridine), whereas blends including poly(2-vinylpyridine) s
how a low critical solution temperature at 140-175-degrees-C.