近场静电纺丝聚酰亚胺纤维膜的制备及其疏水性研究OA

To address the challenges associated with the poor processability and low hydrophobicity of polyimide(PI),this study employs fluorinated polyimide(FPI)as the matrix polymer and utilizes a novel site-specific deposition technique—near-field electrospinning(NFES)—to fabricate FPI fiber membranes(FPI FMs)with microscale surface roughness.By syn-ergistically regulating both molecular structure and microstructural morphology,the hydrophobic properties of the FPI FMs were significantly enhanced.The prepared membranes were systematically characterized using scanning electron micro-scopy(SEM)and contact angle measurements,and their surface wettability was compared with that of commercial Kapton films and FPI casting films.The results demonstrate that NFES technology enables precise control over membrane pore geometries and allows for the fabrication of fibrous membranes featuring square,rhombic,and triangular pore structures.Moreover,the pore size can be accurately tuned through programmable parameters.Among the various structures,FPI FMs with square-shaped pores and a pore size of 0.4 mm exhibited the highest hydrophobicity,achieving a water contact angle of up to 121.4°.Furthermore,the surface hydrophobicity and long-term stability of these FPI FMs were markedly superior to those of both Kapton films and FPI casting films,highlighting their potential for applications in functional hydrophobic sur-face engineering.