Preparation of NH 2 -POSS/SiO 2 Composite and Investigation of the Thermal Decomposition Kinetics of Its Coating

High Resolution Image Download MS PowerPoint Slide A NH 2 -POSS/SiO 2 composite was successfully synthesized using nanosilica as a surface dispersant in a one-step reaction. The structure and morphology of the NH 2 -POSS/SiO 2 composite were characterized using a suite of techniques, including 1 H NMR spectroscopy, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), energy-dispersive X-ray (EDS) spectrometer mapping analysis, and solid-state 29 Si MAS NMR spectra analysis. To study the application of the NH 2 -POSS/SiO 2 composite in emulsions, it was incorporated into the acrylic emulsion to formulate the coating ((NH 2 -POSS/SiO 2 )-SA coating). The results of the contact angle showed that the addition of the NH 2 -POSS/SiO 2 composite could effectively improve the hydrophobicity of the coating. The thermal performance of the (NH 2 -POSS/SiO 2 )-SA coating was characterized using TG-IR analysis, and its thermal decomposition kinetics was further explored. The thermal decomposition occurs in two stages, each following a single-step reaction mechanism. The corresponding thermodynamic parameters for each stage are as follows: (i) E α = 177.50 kJ mol –1, g (α) = [−ln(1 – α)] 4, A = 3.08 × 10 12 s –1, and (ii) E α = 188.95 kJ mol –1, g (α) = [−ln(1 – α)] (2/3), A = 1.21 × 10 7 s –1 .