The confirmation of polymerisation was determined using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR, Perkin Elmer), and samples were stored in a vacuum oven at 80 °C prior to testing. Samples were analysed at room temperature in the spectral range of 4000–650 cm−1 with 4 scans per sample and a constant compression force of 80 N (n = 3). The confirmation of polymerisation was based on the disappearance of peaks at 815 cm−1 and 1167 cm−1 associated with C=CH and C–O bonding as was previously established [34 (link),35 (link)].
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