Poly (m-phenylene isophthalamide) (PMIA) is a high-performance polymer known for its exceptional thermal stability, mechanical strength, and chemical resistance, making it an ideal candidate for advanced material applications. This study presents the synthesis, characterization, and analysis of poly (m-phenylene isophthalamide) (PMIA)/SiO 2 nanocomposites and porous PMIA films. PMIA/SiO 2 nanocomposites were prepared using in situ interfacial polycondensation, incorporating 3-, 5-, and 7-wt% SiO 2 nanoparticles. Nanocomposite films were fabricated through a controlled casting method, followed by etching SiO 2 particles with hydrofluoric acid to create porous PMIA films. Enhancement of the PMIA/SiO 2 nanocomposites exhibited improved inherent viscosity, indicating high molecular weight and efficient polymerization. Fourier Transform Infrared (FTIR) spectroscopy confirmed the successful integration of SiO 2 into the PMIA matrix. Scanning Electron Microscopy (SEM) revealed uniform pore distribution in the porous films, with pore size increasing with higher SiO 2 content. Thermogravimetric analysis (TGA) demonstrated enhanced thermal stability of PMIA/SiO 2 composites, with degradation temperatures increasing from 440 °C for pure PMIA to 460 °C for composites containing 7-wt% SiO 2 . Mechanical testing indicated that PMIA/SiO 2 composites with 5-wt% SiO 2 achieved optimal tensile strength (31.8 MPa) and elongation at break (30.1%), while higher SiO 2 content resulted in reduced mechanical performance due to particle agglomeration. The dielectric constants of these porous films remained consistently lower than those of their nonporous counterparts throughout the frequency range of 1 Hz to 1 MHz. This work highlights the potential of PMIA/SiO 2 nanocomposites and porous PMIA films for advanced applications requiring thermal and mechanical resilience, with tunable properties achieved through SiO 2 content variation.
Shenshen Ouyang,Tao Wang,Xueying Jia,Yun Chen,Juming Yao,Sheng Wang
A durable and renewable superhydrophobic and superoleophilic poly(m-phenyleneisophthalamide)/silicon dioxide (PMIA/SiO2) membrane was prepared for oil/water separation in harsh conditions, the membrane have a self-indicating capacity when it is to become inoperable. Its nanoroot-shaped micro-nanostructure was achieved by covering each individual electrospun PMIA/SiO2 nanofiber with a dense silicone nanofilament layer to form a superhydrophobic surface, the water contact angle was more than 150°and the sliding angle was less than 1°. The porous nanofiber network served as a substrate to ensure the high absorption capacity of oils and oil/water separation efficiency, and increase the roughness for hydrophobicity . Its superhydrophobicity, high separation efficiency, and excellent stability and durability in oil/water separations under various extreme conditions, such as high temperature, acid/alkali solutions, and seawater for long periods can be preserved. This behavior is attributed to the robust micro-nanostructure, superior corrosion resistance , and excellent mechanical properties . Congo red in the PMIA substrate acts as a color indicator to indicate superhydrophobic surface failure, and the disabled material can be recovered absolutely by in-situ regrowth of silicone nanofilaments. This material is expected to become a highly effective renewable and sustainable material for oil-spill cleanup and recycle.
危险品化学品经营许可证（带存储）