Solution-processable polyimide aerogels with high hydrophobicity

Wu, Shuai; Du, Ai; Huang, Shang-Ming; Sun, Wei; Xiang, Yating; Zhou, Bin

doi:10.1016/j.matlet.2016.04.099

Cited by 36 publications

(28 citation statements)

References 12 publications

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“…Although almost forgotten for around four decades, the interest in aerogels became vivid again after the development of the alkoxide route to prepare oxide aerogels in the early seventies of the last century by Teichner [2]. In the last two decades new types of aerogels were developed, based on polyurethane [3,4], polyimide [5,6,7], polyamide [8], and hybrids of these with, for example, silica [9,10]. A new development took concurrently place: biopolymer aerogels or bio-aerogels, were synthesized from polysaccharides and proteins.…”

Section: Introductionmentioning

confidence: 99%

Review on the Production of Polysaccharide Aerogel Particles

et al. 2018

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A detailed study of the production of polysaccharide aerogel (bio-aerogel) particles from lab to pilot scale is surveyed in this article. An introduction to various droplets techniques available in the market is given and compared with the lab scale production of droplets using pipettes and syringes. An overview of the mechanisms of gelation of polysaccharide solutions together with non-solvent induced phase separation option is then discussed in the view of making wet particles. The main steps of particle recovery and solvent exchange are briefly described in order to pass through the final drying process. Various drying processes are overviewed and the importance of supercritical drying is highlighted. In addition, we present the characterization techniques to analyse the morphology and properties of the aerogels. The case studies of bio-aerogel (agar, alginate, cellulose, chitin, κ-carrageenan, pectin and starch) particles are reviewed. Potential applications of polysaccharide aerogel particles are briefly given. Finally, the conclusions summarize the prospects of the potential scale-up methods for producing bio-aerogel particles.

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Section: Introductionmentioning

confidence: 99%

Review on the Production of Polysaccharide Aerogel Particles

et al. 2018

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“…This leads to severe modifications in the transport properties of the polymer, the permeability, and selectivity coefficients growing several times [83,84]. As a consequence, scCO2 is largely used in the production of nanoparticles, foams, aerogels, and membranes based on linear [85][86][87] or cross-linked [88][89][90][91][92] PIs. These materials have interesting features (high porosity, tunable shrinkage, nano-and micro-cavities, high surface area, ultralow dielectric constant, and mechanical resilience) that open up new possibilities in the applicability of PI-based systems such as catalytic systems, separation membranes, aviation, aerospace, construction, and others [93][94][95][96][97].…”

Section: Synthesis and Processing Of Pis In Supercritical Fluidsmentioning

confidence: 99%

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Rusu¹,

Abadie²

2021

Polyimide for Electronic and Electrical Engineering Applications

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The development of high-performance bio-based polyimides (PIs) seems a difficult task due to the incompatibility between petrochemical-derived, aromatic monomers and renewable, natural resources. Moreover, their production usually implies less eco-friendly experimental conditions, especially in terms of solvents and thermal conditions. In this chapter, we touch some of the most significant research endeavors that were devoted in the last decade to engineering naturally derived PI building blocks based on nontoxic, bio-renewable feedstocks. In most cases, the structural motifs of natural products are modified toward amine functionalities that are then used in classical or nonconventional methods for PI synthesis. We follow their evolution as viable alternatives to traditional starting compounds and prove they are able to generate eco-friendly PI materials that retain a combination of high-performance characteristics, or even bring some novel, enhanced features to the field. At the same time, serious progress has been made in the field of nonconventional synthetic and processing options for the development of PI-based materials. Greener experimental conditions such as ionic liquids, supercritical fluids, microwaves, and geothermal techniques represent feasible routes and reduce the negative environmental footprint of PIs' development. We also approach some insights regarding the sustainability, degradation, and recycling of PI-based materials.

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“…Polyimides (PIs) have excellent thermal stability, chemical resistance, and good mechanical properties. [ 24–27 ] Recently, PI aerogels have drawn extensive attention due to their excellent properties and have been applied in high temperature environments. However, PI aerogels are also generally susceptible to moisture because of the hydrophilic nature of imide rings and oxygen links in PI backbone, as well as the nanoporous inner structure of the aerogels.…”

Section: Introductionmentioning

confidence: 99%

“…However, PI aerogels are also generally susceptible to moisture because of the hydrophilic nature of imide rings and oxygen links in PI backbone, as well as the nanoporous inner structure of the aerogels. [ 19,27,28 ] Water can easily penetrate into the native PI aerogels, especially in the hygrothermal environment, which will cause the destruction of the pore structure and degeneration of the performance of aerogels. [ 12,19,27,28 ] Therefore, despite their excellent properties and great application potential, the poor water resistance of PI aerogels remains a great challenge.…”

Section: Introductionmentioning

confidence: 99%

Moisture‐Resistant and Mechanically Strong Polyimide‐Polymethylsilsesquioxane Hybrid Aerogels with Tunable Microstructure

Wang

Liu

et al. 2021

Macro Materials & Eng

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Moisture‐resistant and mechanically strong polyimide (PI)‐polymethylsilsesquioxane hybrid aerogels with doubly cross‐linked structures are synthesized through sol–gel technology and supercritical CO2 fluid drying. By using bis(trimethoxysilylpropyl) amine as a cross‐linker, the end‐capped polyamide acid derived from biphenyl‐3,3′,4,4′‐tetracarboxylic dianhydride and 4,4′‐oxydianiline is cross‐linked with a silica network using methyltrimethoxysilane as the silica source precursor. The resultant hybrid aerogels show low density (0.12–0.15 g cm−3), low thermal conductivity (0.032–0.049 W m−1 K−1), high hydrophobicity (125–140°) and good thermal stability (above 435 °C) with tunable microstructure. With the increase of silica sol volume, the microstructure of hybrid aerogels transforms from fibrous network to hierarchical microstructure. Aerogels with high content of silica sol exhibit good moisture resistance, high Young's modulus (Max. 19.6 MPa), and high specific modulus (Max. 131 kN m kg−1), which are attributed to their unique hierarchical microstructure with a sheet skeleton. These hybrid aerogels are promising in the fields of thermal insulation, aerospace applications and so on.

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Solution-processable polyimide aerogels with high hydrophobicity

Cited by 36 publications

References 12 publications

Review on the Production of Polysaccharide Aerogel Particles

Review on the Production of Polysaccharide Aerogel Particles

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Moisture‐Resistant and Mechanically Strong Polyimide‐Polymethylsilsesquioxane Hybrid Aerogels with Tunable Microstructure

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