was used to measure the polydispersity index (PDI) of all the polymers.
The SEC was equipped with a Waters 2414 refractive index detector
and a Waters 515 high-performance liquid chromatography pump. THF
was used as the eluent, and the flow rate is 1.0 mL/min. The molecular
weight and PDI were calculated using monodispersed polystyrene as
the calibration standard. The 1H NMR spectra were recorded
on a Bruker AVANCE III 600 NMR spectrometer. SEM observations were
performed using Zeiss EVO 18 operating at 10 kV. XPS spectra were
obtained on a Thermo Fisher Scientific spectrometer (ESCALAB 250Xi)
with a micro-focused raster-scanned X-ray beam. The take-off angle
is 90°. FTIR spectra were recorded on a Bruker Vector 70 FTIR
spectrometer. CAs of water or oil droplets (5.0 μL) were measured
on a Data Physics OCA 20 instrument. Atleast five different points
on the samples were measured.