React ir ic10

¹H NMR spectra were recorded on a Brucker 400 spectrometer in CDCl₃. Residual CHCl₃ (7.26 ppm) was used as internal reference. ¹³C NMR spectra were recorded at 100.6 MHz in CDCl₃. Residual CHCl₃ (77.0 ppm) was used as internal reference. In situ FTIR spectra were collected on a Mettler Toledo React IR ic10, which was equipped with a diamond ATR probe, using an ic IR analysis system. The probe was placed into the absorption mixture. Spectra were collected in situ during CO₂ absorption, while the mixture was stirred continuously using a magnetic stir bar. ESI-MS spectra were recorded on a Thermo Finnigan LCQ Advantage spectrometer in ESI mode at a spray voltage of 4.8 kV.

The reaction processes at different reaction times of siloxane and alcohol were noted on an In-Situ IR (METTLER TOLEDO ReactIR ic10, America). 3-aminopropyltriethoxysilane (KH550) (2.0000 g) and ethylene glycol (2.0000 g) were added into water (5 mL) and then stirred at room temperature. The trend of peak intensity and peak position of the target functional group over time was monitored by In-Situ IR.