Abstract
AbstractPolymers with different compositions of vinyl alcohol and vinyl acetate units (P(VA‐VAc)), obtained by alcoholysis of poly(vinyl acetate) with sodium methoxide, were mixed with poly(N‐vinyl‐2‐pyrrolidone) (PVP). The miscibility was studied observing glass transition temperatures by differential scanning calorimetry (DSC). The calorimetric results indicate that for vinyl alcohol unit contents in P(VA‐VAc) of roughly 70 wt.‐% or more, P(VA‐VAc)/PVP blends are fully miscible, whereas blends obtained from P(VA‐VAc) with vinyl alcohol contents lower than the above mentioned values are only partially miscible or even immiscible. The miscibility is attributed to hydrogen bond interactions between hydroxyl groups in P(VA‐VAc) and the carbonyl group of PVP.
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