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).