Grafting electrosprayed silica microspheres on cellulosic textile via cyanuric chloride reactive groups

Figures & data

Figure 1. Reaction steps for grafting microspheres/capsules onto cellulosic fibres: (a) functionalisation of silica microspheres with amine groups; (b) linkage of cyanuric chloride molecule to amine-functionalised silica microspheres; and (c) competing nucleophilic substitution reaction of triazine functionalisation.

Figure 2. (a) SEM, (b) TEM, (c) STEM images of silica submicron particles and (d) particle size distribution of synthesised silica particles.

Figure 3. FTIR spectrums of different reaction steps: (a) silica submicron spheres manufactured by electrospraying; (b) amine-functionalised silica microspheres; and (c) functionalised silica modified with cyanuric chloride.

Figure 4. TGA analysis of electrosprayed and amine-functionalised silica spheres.

Figure 5. NMR spectra of the first and second steps of the reaction: (a) surface Si–OH sites on silica; (b) ²⁹Si-NMR analysis of amine functionalised and non-functionalised silica microspheres; and (c) ¹H-NMR analysis of effective modification with 2,4,6-trichloro-1,3,5-triazine.

Figure 6. Cellulosic fabric: (a) SEM image; and (b) qualitative and quantitative demonstration by EDX analysis of covalent grafting of silica microspheres.