Polyimide-based aerogel foams, via emulsion-templating

Teo, Nicholas; Gu, Zipeng; Jana, Sadhan

doi:10.1016/j.polymer.2018.10.030

Cited by 50 publications

(47 citation statements)

References 28 publications

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“…These compound materials are dried gels with several specific properties such as high specific surface area, high porosity, low apparent density, large volume of open micro and mesopores, high thermal and acoustic insulation, low refractive, and low dielectric constant [ 1 , 2 , 3 , 4 ]. Aerogels can be obtained from carbon [ 5 , 6 , 7 , 8 , 9 ], polymers [ 10 , 11 , 12 , 13 , 14 ], or inorganic compounds, namely, SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , and others [ 1 , 4 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

Donėlienė¹,

Fataraitė‐Urbonienė

Rudzikas³

et al. 2021

Molecules

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The aim of this investigation was to synthesize high porosity TiO2 aerogel by applying sol-gel and subcritical drying methods and to identify the influence of reagent’s nature and synthesis conditions on their structural and optical properties. Methods of XRD, FT-IR, BET, STA, SEM, and UV-vis were applied to investigate and compare the properties of synthesized TiO2 aerogels and to determine the most effective synthesis route. The structural parameters of the synthesized materials can be varied by changing the precursor type (titanium (IV), isopropoxide (TIP), or tetrabutylorthotitanate (TBOT)) and the nature of the solvent used for additional exchange (n-hexane (nH), cyclohexane (CH), or diethyl ether (DE)). All of the subcritical dried samples show the amorphous structure, which tends to crystallize into the anatase phase after calcination. The number of micro and mesopores and the specific surface area depends on the synthesis conditions. The pores with the highest diameter have been found for additionally nH exchanged and aged aerogel synthesized from precursor TIP. Despite the imperfections in the structure, the produced aerogels show structural and optical properties typical of the TiO2 structures mentioned in the literature.

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Section: Introductionmentioning

confidence: 99%

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

Donėlienė¹,

Fataraitė‐Urbonienė

Rudzikas³

et al. 2021

Molecules

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“…[ 20 ] Recently, oil in oil (O/O) emulsion system was proposed to incorporate macro‐meso pores in polyimide aerogel materials. [ 21,22 ] Besides, both interconnected (open‐cell) and isolated (closed‐cell) pores are reported in the literature. [ 23 ] It is shown that highly interconnected pores can be achieved by polyHIPE, [ 24 ] where small windows are present within the large pores or cavities.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of porous polydimethylsiloxane structures with adjustable porosity and pore morphology using emulsion templating technique

Abshirini

Saha

Cummings

et al. 2021

Polymer Engineering & Sci

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Porous polydimethylsiloxane (PDMS) framework with adjustable pore structures has been fabricated by polymerization of the continuous phase in the emulsion templates. Different types of surfactants, including nonionic (Triton X‐100), cationic (Benzalkonium chloride), anionic (sodium dodecyl sulfate), and silicone‐based block copolymer were used to stabilize the water‐in‐oil emulsion system. Deionized water with a wide range of internal phases varying from 10% to 60% by weight was employed to make the low internal phase emulsion and medium internal phase emulsion. The effect of surfactant type, surfactant concentration, and the internal phase volume on the stability of the emulsion, pore morphology, and pore size distribution was explored. The stability of the emulsion was investigated by comparing the pore morphology of the cured sample at different set times, such as 0, 6, and 72 h. Scanning electron microscopy was employed for the characterization of the porous structures. The image analysis was conducted, and the pore size distribution, porosity, and open‐cell ratio of each sample were calculated. Interconnected pores have been seen in the porous PDMS made from emulsions with an internal phase larger than 30%. The results demonstrated that the frequency of open‐cell pores and the pore size is dependent on the surfactant types.

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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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Polyimide-based aerogel foams, via emulsion-templating

Cited by 50 publications

References 28 publications

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

Effect of Precursor Nature and Sol-Gel Synthesis Conditions on TiO2 Aerogel’s Structure

Synthesis and characterization of porous polydimethylsiloxane structures with adjustable porosity and pore morphology using emulsion templating technique

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

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