Sta7000 series

FT-IR spectra of benzoxazine
and polybenzoxazine
samples were obtained with an Agilent Cary 630 ATR spectrometer. About
10 mg of the sample was loaded in the ATR spectrometer, with a minimum
of 16 scans collected for each sample at a resolution of ±4 cm^–1. ¹H NMR spectra were recorded with a Bruker
400 MHz using an 8000 Hz spectral width, a relaxation delay of 3.5
s, a pulse width of 45, 32 K data points, CDCl₃ as a solvent,
and tetramethylsilane (TMS) as an internal standard, with a minimum
of 32 scans collected for each sample. Differential scanning calorimetry
(DSC) measurements were carried out using a Hitachi DSC 7020. The
instrument was calibrated with indium supplied by Hitachi. About 7–10
mg of the sample was used, and the thermograms were recorded from
RT to 300 °C under N₂ (60 mL/min) at a heating rate
of 10 °C/min. Thermogravimetric analysis (TGA) was carried out
with a Hitachi STA7000 series. The instrument was calibrated with
calcium oxalate and aluminum supplied by Hitachi. About 10 mg of the
samples was taken for each analysis under N₂ (60 mL/min)
and at a heating rate of 20 °C/min.