The thermal properties of physical blends containing benzoxazine monomer and polycaprolactone (PCL) were monitored by DSC and Fourier transform infrared spectroscopy (FTIR). The ring-opening reaction and subsequent polymerization reaction of the benzoxazine were facilitated significantly by the presence of a PCL modifier. Hydrogen-bond formation between the hydroxyl groups of polybenzoxazine and the carbonyl groups of PCL was evident from the FTIR spectra. Only one glass-transition temperture (Tg) value was found in the composition range investigated, and the Tg value of the resulting blend appeared to be higher in the blend with a greater amount of PCL.
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Ishida et al. (2001) studied this question.
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