Electrospun\nPolyvinylidene Fluoride Membranes: Waterproofing\nand Acoustic Performance for Air and Acoustic Vents in Electronics

Advancements in electronic devices\ndemand materials capable of\nexceptional performance in various challenging environments. This\nstudy presents polyvinylidene fluoride (PVDF) nonwoven membranes with\ncontrolled porosity, created using an air-guided electrospinning method,\nfollowed by a calendaring process. These membranes exhibit a combination\nof water-repellent properties and sound transmission capabilities,\nmaking them ideal candidates for use in air and acoustic vents in\nelectronic systems. A key feature of our membrane is the three-dimensional\nnanostructured pores, ranging from 0.20 to 0.76 μm, with a mean\npore size of 0.51 μm, achieved through the formation of randomly\narranged long nanofibers. By employing both experimental and theoretical\nmethods, we achieved impressive performance metrics: air permeability\nof 0.86 cm<sup>3</sup>/cm<sup>2</sup>/s, water contact angles up to\n139.3°, and breakthrough pressure as low as 0.27 MPa. Our PVDF\nnonwoven membranes maintain an optimal balance of stiffness, density,\nand air permeability, leading to exceptionally low sound transmission\nloss values ranging between −10 and −40 dBV/Pa, all\nwhile preserving their structural integrity. These findings contribute\nto the development of next-generation waterproof and acoustically\npermeable membranes, offering enhanced performance capabilities in\ndemanding operational scenarios. This work advances the field of nanomaterials,\nenvironmental engineering, and acoustic technologies, with the potential\nto influence the design of future electronic devices.