Phosphorus-Containing Photopolymer Networks: Flame Response, Ion Binding, Hydrolysis and Functional Performance

Phosphorus-containing monomers and oligomers can alter the thermal decomposition, char formation, ion coordination, polarity and hydrolytic behaviour of photocurable networks. These effects are chemistry-specific: phosphate, phosphonate, phosphinate and phosphine-oxide motifs differ in oxidation state, hydrolysis susceptibility, acidity and interaction with radical cure. This review separates reactive phosphorus incorporation from additive flame retardants and from phosphorus used for ion-binding or surface functionality. It examines how UV-cure conversion, fire response, smoke and residue must be measured separately; why a reduction in one flammability metric cannot be promoted to a universal safety claim; and how water uptake, hydrolysis and leaching can reverse apparent benefits during service. The engineering outcome is a qualification architecture that links phosphorus identity to cure, thermal decomposition, chemical stability and the intended function of the printed or coated article. ER-413.