Facile and environment-friendly preparation of high-performance polyimide aerogels using water as the only solvent

Abstract

This study described a facile and environmentally friendly method for preparing polyimide (PI) aerogels via sol-gel process and freeze-drying without the use of organic solvents. The prepared PI aerogels showed...

Research Progress and Application of Polyimide-Based Nanocomposites

“…Typically, cosolvent metal alkyl oxides or nanofillers with PAA or PI monomers were formed, hydrolyzed condensation to achieve a transparent sol system, and slowly polymerized between colloids to form a gel with a three-dimensional network structure. It was finally heated to volatilize small molecules such as solvent and water to obtain PI composites [ 132 , 133 ]. Chen et al [ 134 ] proposed a simple freeze-drying technology to synthesize PI/CNT composite aerogels lightly and compressibly.…”

Ultralight and Superelastic Nanofiber Aerogels with In-Situ Loaded Polypyrrole for High-Efficient Cr(VI) Adsorption

“…[29][30][31] On the basis of retaining the advantages of traditional aerogels, with the strength and toughness of nanofibers, nanofiber aerogels have greatly improved mechanical properties and become an excellent candidate for adsorbents. [32][33][34][35][36][37] Therefore, it is of great significance to explore an economical, environmentally friendly, and shape-designable polypyrrole composite aerogel material for Cr(VI) adsorption.…”

“…[29][30][31] On the basis of retaining the advantages of traditional aerogels, with the strength and toughness of nanofibers, nanofiber aerogels have greatly improved mechanical properties and become an excellent candidate for adsorbents. [32][33][34][35][36][37] Therefore, it is of great significance to explore an economical, environmentally friendly, and shape-designable polypyrrole composite aerogel material for Cr(VI) adsorption.In view of the above contents, the present study reports our success in constructing ultralight and superelastic 3-D nanofiber composite aerogels (PNFA) as efficient adsorbents for Cr(VI) in wastewater by in-situ polymerization of polypyrrole on cellulose acetate (CA) nanofibers followed by freeze-drying method. The obtained PNFA shows high porosity, large specific surface area and environmental stability, and its maximum adsorption capacity of Cr(VI) can reach up to 244.65 mg/g.…”

A water-borne photo-sensitive polyimide precursor for an eco-friendly process of preparing organic thin film transistors

“…Water-borne poly(amic acid) salts (W-PAASs) have been proposed for the preparation of polymeric precursors for PI via an eco-friendly process because of the use of water as a synthetic medium. 6,[29][30][31][32][33][34] This facile strategy provides a one-pot procedure for polymerizing dianhydride and diamine monomers in aqueous media with organic bases. The single-step reaction and use of water as a polymerizing medium provide economic and ecological efficiency.…”

“…Pioneering reports suggest the role of an organic base as follows: (i) inhibiting hydrolysis of dianhydride in an aqueous medium, (ii) forming a water-soluble polymer salt by neutralizing the carboxylic acid, and (iii) decoupling with the carboxylic acid group during thermal imidization to obtain pure polyimide materials. 34 Considering the requirement for an organic base, we propose the use of dimethylaminopropylmethacrylamide (DMAPMAA) as an organic base for the water-based synthesis of polyimide precursors to introduce photosensitivity into the resulting PAAS. DMAPMAA has an alkylamine functional group, which provides water miscibility and acidity (p K a = 9.25).…”