The phase behaviour of blends of poly(1-vinyl-2-pyrrolidone) and poly(vinyl formal) was studied by means of differential thermal analysis and differential mechanical thermal analysis. Both techniques showed that the blend studied exhibits a single glass transition, which is intermediate between the glass transitions associated with each constituent polymer and depends on polymer concentration. Discussion of this phase 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 the consequence of hydrogen-bonding interactions between both polymers as demonstrated by infra-red spectroscopy. An additional study on the mechanism of complex formation associated with poly(1-vinyl-2-pyrrolidone) and poly(vinyl butyral) is also carried out.
Посилання на статтю:
Study of the miscibility and specific interactions between poly(1-vinyl-2-pyrrolidone) and poly(vinyl formal) / Jose R. Isasi, Luis Cesteros and Issa Katime // Polymer. – 1993. – Vol 34. – P. 2374-2379.