Effect of h‐<scp>BN</scp> Modification Strategies on the Performance of Pyrazine‐<scp>PVDF</scp> Cigarette Filter Materials

ABSTRACT In this study, a functional nanofibrous membrane with a core–shell structure was constructed by coaxial electrostatic spinning and used to encapsulate the high‐boiling spice, 2‐phenylethylpyrazine (2‐PEP). The shell material was polyvinylidene fluoride (PVDF), and the core material was self‐synthesized 2‐PEP with high purity verified by 1 H NMR and 13 C NMR spectroscopy. The thermal stability and release kinetics of the membranes were modulated by the introduction of pristine hexagonal boron nitride (h‐BN), exfoliated h‐BN (EBN), and dopamine‐functionalized h‐BN (MEBN) into PVDF. The SEM and TEM characterization showed that the prepared MEBN presented a highly homogeneous dispersion on the fiber surface, effectively constructing a continuous heat transfer network. Compared with pure PVDF fibers, the thermal equilibrium time of the MEBN‐enhanced nanofiber membrane was shortened from 293 to 118 s, and the release rate of the flavor increased from 12% to 73.3% at 50°C, which resulted in a faster response and higher release efficiency. The optimized nanofiber membrane has a water contact angle of 135.3°, ensuring moisture resistance in humid environments. The material demonstrates superior controlled release capability and environmental adaptability in encapsulating high boiling point fragrances and highlights the potential application of functional nanofiber membranes in the tobacco industry.