To achieve uniform structural composition of neutral macromolecular bonding agents and enhance their comprehensive performance， a novel monomer， cyanoethyl acrylate （CEA）， was designed and synthesized. Through free radical copolymerization with hydroxyethyl acrylate （HEA）， a new type of neutral macromolecular bonding agent was prepared. The structures of monomers and polymers were characterized by Fourier transform infrared spectroscopy （FTIR） and nuclear magnetic resonance （NMR）， and the hydroxyl value and glass transition temperature （T_g） were determined. The bonding agent was applied in NEPE high-energy propellant formulations to investigate its impact on the process and mechanical properties. Results show that CEA and HEA exhibit matched polymerization reactivity， enabling the production of structurally homogeneous copolymers without controlling the feed method. Compared to traditional neutral bonding agents， this bonding agent reduces the yield value of propellant slurry to 74.4 Pa and apparent viscosity to 337 Pa·s， making a notable improvement of processing performance. The propellant grain achieves tensile strength of 0.98 MPa and maximum elongation of 70.1% at ambient temperature， representing 22.5% and 27.5% improvements respectively.