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Scope of applications of hybrid PHU coatings with representative components involved in their preparation: (a) abrasion high-resistance coatings based on PHU–epoxy hybrids;97,105,106 (b) flame retardant materials based on phosphorus containing PHUs;107 (c) anticorrosion coatings based on silica containing hybrid PHUs;59 and (d) antimicrobial coatings based on ammonium bearing PHUs.108
