Jr. Isasi et al., STUDY OF THE MISCIBILITY AND SPECIFIC INTERACTIONS BETWEEN POLY(1-VINYL-2-PYRROLIDONE) AND POLY(VINYL FORMAL), Polymer, 34(11), 1993, pp. 2374-2379
The phase behaviour of blends of poly(1-vinyl-2-pyrrolidone) and poly(
vinyl formal) was studied by means of differential thermal analysis an
d differential mechanical thermal analysis. Both techniques showed tha
t the blend studied exhibits a single glass transition, which is inter
mediate between the glass transitions associated with each constituent
polymer and depends on polymer concentration. Discussion of this phas
e behaviour in terms of various common equations is also carried out.
The blend preparation method as well as the blend thermal history are
found to exert a relevant influence on the phase behaviour associated
with the polymer alloy studied here. This behaviour is explained as th
e consequence of hydrogen-bonding interactions between both polymers a
s demonstrated by infra-red spectroscopy. An additional study on the m
echanism of complex formation associated with poly(1-vinyl-2-pyrrolido
ne) and poly(vinyl butyral) is also carried out.