Abstract
The miscibility behavior of poly(4-hydroxystyrene) (PHS) with poly(4-acetoxystyrene)(PAS) was examined by differential scanning calorimetry and Fourier-transform infrared spectroscopy. The PHS-PAS blend system was judged to be miscible on the basis of the appearance of each single, composition-dependent glass transition temperature for the blend. On the other hand, infrared absorption bands attributed to various inter- and intramolecular hydrogen-bonding interactions were identified. Especially, the direct evidence has been obtained for hydrogen-bonding interactions between the hydroxyl group of PHS and the carbonyl group of PAS. The relative strength of these interactions was found to be weaker than those of inter- and intramolecular hydrogen-bonding interactions in pure PHS. Furthermore, the lower critical solution temperature behavior was observed for these blends.
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