Poly(N‐vinyl‐2‐pyrrolidone) (PVP) was blended with poly[styrene‐co‐(4‐hydroxytyrene)] (PSH) which was obtained from the random copolymer poly[styrene‐co‐(4‐acetoxystyrene)] (PSA). The miscibility of PVP/PSH blends in a composition 1 : 1 by weight was evaluated by differential scanning calorimetry (DSC), non‐radiative energy transfer (NET) and Fourier transform infrared (FTIR) spectroscopy. It was found that the blends become miscible when the hydroxystyrene units (HS) in PSH exceed 11 mol‐%. The driving force of miscibility may be attributed to hydrogen bonding between OH in PSH and in PVP. The experimental results of miscibility were compared with that estimated from a “miscibility parameter” (MP) concept, and we found that the general trend of MP values is in agreement with the experimental results.
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Zhu et al. (1994) studied this question.
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