N-(2-hydroxypropyl) methacrylamide (HPMA) can be used to produce watersoluble polymers with non-immumogenic properties that are widely used in drug delivery applications. In this study, an HPMA modification was proposed, which leads to lipophilic nanoparticle (NP) production. The ring opening polymerization of HPMA with a lactide (LT) was performed to obtain the reactive HPMA-LA n macromonomers with different average 2 chain lengths. The HPMA modification produced lipophilic macromonomer starting materials that were subsequently used to obtain polymer nanoparticles that are suitable for drug delivery applications of hydrophobic drugs. Different strategies were explored. First, emulsion-free radical polymerization was conducted to obtain the monodispersed PEGylated polymer NPs. Next, solvent polymerization was performed to produce a poly(HPMA-LA n )based polymer solution, which was used to produce the NPs via flash nanoprecipitation.Because these NPs are designed for drug delivery applications, their fast degradability in a biological medium was verified. Additionally, the ability to load and release a drug (i.e., dexamethasone) was verified for the NPs, which were synthesized using the proposed strategies, to demonstrate the effectiveness of the HPMA functionalization to obtain a system for delivering lipophilic drugs.To evaluate the release profile of the drug, 3 mL of the NP solution was loaded in a Slide-A-Lyzer cassette (Thermo Scientific, MW cutoff: 3.5 kDa) and dialyzed against 200 mL of PBS. The samples (0.2 µL) were withdrawn from the cassette after 1, 4, 8 and 24 h of dialysis and treated, as reported before, to determine the drug content in the NP solution. Figure 4. Evolution of NPs size (a), PDI (b) and relative scattered intensity (c) as a function of time in PBS for: poly-(HPMA-LA 4 -co-PEGMA 45 ) (■), poly-(HPMA-LA 6 -co-PEGMA 45 ) (•), and poly-(HPMA-LA 8 -co-PEGMA 45 ) (▲). The average particle size, shown in Figure 4a, remains almost constant during the time,despite the fact that the NPs that were based on HPMA-LA 6 and HPMA-LA 8 exhibited an increase (lower than 10% of the starting particle size), which is attributed to the swelling