Porous aromatic polyamides the easy and green way

Fabrication of microporous PMMA using ionic liquids: An improved route to classical ScCO2 foaming process

“…The enhancement of the mechanical behavior due to the presence of the porosity has already been observed in the previous works of our group, in which microporous aramids were produced using ionic liquids presented relative Young's moduli and stress at break point values higher than those expected considering only the density reduction [14,15]. In this sense, the isolated effect of the cell-size reduction down to micro-and nano scale on the mechanical behavior has already been measured but has not been accurately modeled.…”

“…Our group recently developed a very promising technique in which commercial aramid films based on poly(m-phenylene isophthalamide) (MPIA) were effectively foamed through the ScCO 2 batch foaming process using ionic liquids (ILs) (1-allyl-3-methylimidazolium chloride) to nucleate and retain the CO 2 molecules [14]. We surprisingly observed that porous aramids could be fabricated by removing the IL in distilled water (avoiding the use of ScCO 2 ) [15], which simplified the mechanism to obtain porous structures and had not been previously reported in the literature [16]. This technique is similar to the salt leaching process, in which porous networks are created and optimized employing different salts (NaCl, NaHCO 3 , etc.)…”

Synthesis of polyaramids in γ-valerolactone-based organic electrolyte solutions

“…[26][27][28][29] OESs were also proven to be suitable solvents for the synthesis of PPTA and for processing PMIA into porous films. [30][31] However, these applications still relied on the addition of amide solvents such as NMP or DMA. Recently, we have shown that OESs based on γ-valerolactone (GVL) are excellent solvents for PMIA and ODA/PPTA, and that they can be used for wet spinning polyaramid fibers.…”

γ-Valerolactone-based organic electrolyte solutions: a benign approach to polyaramid dissolution and processing

“…OESs have recently also been used in the synthesis of aramids, 11 and for processing aramids into porous films. 23 However, in these studies, NMP and DMA were used as co-solvents, which definitely still leaves room for improvement.…”