“…The fragments of poly(ethylene glycol) (PEG)—a hydrophilic polymer improving solubility and acting as a transporter—are widely used in development of such scaffolds. A promising alternative to PEG is comprised by poly(ethylene phosphates) (PEPs), which are structurally similar to the phosphoester backbone of polynucleic acids: chemically versatile, biocompatible, and biodegradable; those properties allow the development of tailored materials suitable for different uses, including as polymers for biomedical applications [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. PEP is usually prepared by the catalytic ring-opening polymerization (ROP) of cyclic ethylene phosphate monomers (CEPMs) ( Scheme 1 a).…”