Abstract
Blends of poly(vinyl alcohol) (PVAl) with a copolyamide (CoPA) randomly composed of 1:1:1 (wt) nylon 6, nylon 66 and nylon 610 structural units were prepared by solution casting from a common solvent N,N-dimethylformamide. The miscibility for the blends was established on the basis of studies by differential scanning calorimetry (DSC). Single, composition-dependent glass transition temperatures ( T g ) were observed, indicating that the PVAl/CoPA blends are miscible in the amorphous state. The phase behaviour of the blends was investigated. It was found that the PVAl/CoPA system exhibited lower critical solution temperature (LCST) behaviour, and the cloud point temperatures were measured using DSC. A FTIR study revealed that there are intermolecular hydrogen-bonding interactions between the two polymer components.
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