400 dsx nmr

The structure of the synthesized material was confirmed using Fourier-transform infrared (FT-IR) spectroscopy (Bruker VERTEX 80v, Berlin, Germany) and Carbon-13 nuclear magnetic resonance (¹³C-NMR) spectroscopy (Bruker 400 DSX NMR, Berlin, Germany). The ¹³C cross-polarization (CP)/magic-angle spinning (MAS) NMR experiment was conducted at a Larmor frequency of 100.61 MHz. To minimize the spinning sideband, it was measured at an MAS rate of 12 kHz. Tetramethylsilane (TMS) was used as a standard to record the NMR spectra.
The thermal properties were investigated by differential scanning calorimetry (DSC, NETZSCH 200F3, Berlin, Germany) and thermogravimetric analysis (TGA, TA Instruments TA Q500, New Castle, DE, USA) under N₂ atmosphere. The rate of temperature increase was maintained at 20 °C/min.
The degree of crystallinity (DC) of the film was measured with an X-ray diffractometer (XRD, Rigaku XRD, Tokyo, Japan) with Cu Kα radiation. Measurements were carried out at a scan rate step size of 2°/min in the 2θ range 2°–40°. The pore size of the films was investigated using a field emission scanning electron microscope (SEM, JEOL JSM-6500F, Tokyo, Japan). To investigate the optical transparencies, a spectrophotometer (Konica Minolta CM-3600D, Tokyo, Japan) and a UV-visible (UV-vis) spectrophotometer (Shimadzu UV-3600, Tokyo, Japan) were used.

FT-IR spectroscopy (PerkinElmer, Spectrum Two, Llantrisant, UK) was used to confirm the synthesis of the nanofillers and CPI. Room-temperature solid-state ¹³C cross-polarized (CP)/MAS NMR spectroscopy (Bruker 400 DSX NMR, Berlin, Germany) was performed at a Larmor frequency condition of 100.61 MHz. Chemical shifts were corrected using tetramethylsilane as reference.