Scheme 1. Design and fabrication of the on-site applicable flat
anti-adhesion coating.
Scheme 1 illustrates the preparation of the coating and its
multi-crosslinked networks that are generated via the synergetic
reactions including ring-opening, co-hydrolysis, and polycondensation
reactions. The selection of the silicon precursors including 60 wt%
lubricating molecules of silanol- terminated polydimethylsiloxane
(HO-PDMS-OH, molecular weight of ~260 g/mol), and the
remaining 40 wt% was comprised of γ-aminopropyltriethoxysilane (APTES),
and 3-glycidoxypropyltrimethoxysilane (GPTMS) at an equimolar ratio, as
determined by the equimolar reaction between the amino and the epoxy
groups. The low molecular weights of the precursors provide the mixture
with a low viscosity, exhibiting both fluidity and substrate
wettability, thus allowing solvent-free processing and convenient
application onto various substrates. Subsequently, the desirable coating
properties can be obtained by simply waiting for 7 days to allow the
spontaneous synergetic reactions to occur. The precursor and resultant
coating were characterized by matrix-assisted laser desorption
ionization time-of-flight mass spectrometry (MALDI-TOF-MS, Fig. S1),
Fourier-transform infrared spectroscopy (FTIR, Fig. S2), X-ray
photoelectron spectroscopy (XPS, Fig. S3), and energy-dispersive X-ray
spectroscopy (EDX, Fig. S4).