Investigating crosslinking density in the curing process of UV-cured nanocomposites using dynamic mechanical thermal analysis

This study investigates the crosslinking density of UV-cured nanocomposites using Dynamic Mechanical Thermal Analysis (DMTA). Urethane acrylate resins were modified with varying percentages of polyaniline (PANI) (۱%, ۳%, and ۵%) to evaluate the impact on crosslinking behavior and mechanical properties. DMTA was employed to measure key parameters such as storage modulus (E'), loss modulus (E''), and tan δ, which were correlated with crosslink density. Results indicate that the addition of PANI influences the crosslinking efficiency, with optimal performance observed at ۳% PANI, where crosslink density (ν) reached ۵۳.۱۸۲ mol/m³. At higher PANI concentrations (۵%), a decrease in crosslinking efficiency was noted, likely due to phase separation or particle aggregation. The findings demonstrate that PANI content significantly affects the network structure and mechanical properties of the nanocomposites, with implications for optimizing UV-curable resin formulations. This work highlights the utility of DMTA in characterizing crosslinking behavior and provides insights into tailoring material properties for advanced applications.

کلیدواژه ها:

Adhesion ، UV cure ، Urethane acrylate ، Cross-link density ، Polyaniline ، DMTA