Intrinsically Highly Hydrophobic Semi-alicyclic Fluorinated Polyimide Aerogel with Ultralow Dielectric Constants

Shen, Dengxiong; Liu, Jingang; Shen, Yang

doi:10.1246/cl.130623

Cited by 25 publications

(11 citation statements)

References 20 publications

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“…Relative k values as low as 1.16 at a frequency of X-band (~11-12 GHz) were obtained for PI aerogels made from 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA), 2,2′-dimethylbenzidine (DMBZ), and 1,3,5-tris(4-aminophenoxy)benzene (TAB) crosslinker. Shen and coworkers have reported intrinsically highly-hydrophobic semi-alicyclic fluorinated PI aerogel with ultra-low k values of 1.17-1.19 in the frequency range of 2-12 GHz [25].…”

mentioning

confidence: 99%

Synthesis and characterization of flexible and high-temperature resistant polyimide aerogel with ultra-low dielectric constant

Zhang¹,

Liu²,

Shen³

2016

Express Polym. Lett.

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Abstract.A polyimide (PI) aerogel with excellent combined thermal and dielectric properties was successfully prepared by the polycondensation of 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 5-amino-2-(4-aminophenyl)benzoxazole (APBO) and octa(amino-phenyl)silsesquioxane (OAPS) crosslinker, followed by a supercritical carbon dioxide (scCO 2 ) drying treatment. The developed PI aerogel exhibited an ultra-low dielectric constant (k) of 1.15 at a frequency of 2.75 GHz, a volume resistivity of 5.45·1014 Ω·cm, and a dielectric strength of 132 kV/cm. The flexible PI aerogel exhibited an openpore microstructure consisting of three-dimensional network with tangled nanofibers morphology with a porosity of 85.6% (volume ratio), an average pore diameter of 19.2 nm, and a Brunauer-Emmet-Teller (BET) surface area of 428.6 m 2 /g. In addition, the PI aerogel showed excellent thermal stability with a glass transition temperature (T g ) of 358.3°C, a 5% weight loss temperature over 500°C, and a residual weight ratio of 66.7% at 750°C in nitrogen.

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mentioning

confidence: 99%

Synthesis and characterization of flexible and high-temperature resistant polyimide aerogel with ultra-low dielectric constant

Zhang¹,

Liu²,

Shen³

2016

Express Polym. Lett.

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“…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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“…Critical conditions are very different depending on the fluid which impregnates the wet gel, and the most commonly used is CO 2 [ 83 , 84 ]. For example, PI aerogels with an intrinsically hydrophobic nature and a dielectric constant as low as 1.19 were prepared by a supercritical CO 2 drying procedure [ 85 ]. Kobayashi et al [ 86 ] reported a structurally new type of aerogel with a 3D ordered nanofiber skeleton of liquid-crystalline nanocellulose by supercritical CO 2 drying.…”

Section: Preparation Of Polymer/carbon Aerogelsmentioning

confidence: 99%

“…Polyimides are widely used in industries for their high performance, such as ultralow dielectric constant, high mechanical strength and thermal stability at high temperatures [ 16 , 85 , 99 , 141 , 142 , 143 , 144 , 145 ]. Therefore, it would be ideal to design PI aerogels for use as highly porous, lightweight and high-temperature stable materials.…”

Section: Structures and Properties Of Polymer/carbon-based Aerogelmentioning

confidence: 99%

Polymer/Carbon-Based Hybrid Aerogels: Preparation, Properties and Applications

et al. 2015

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Aerogels are synthetic porous materials derived from sol-gel materials in which the liquid component has been replaced with gas to leave intact solid nanostructures without pore collapse. Recently, aerogels based on natural or synthetic polymers, called polymer or organic aerogels, have been widely explored due to their porous structures and unique properties, such as high specific surface area, low density, low thermal conductivity and dielectric constant. This paper gives a comprehensive review about the most recent progresses in preparation, structures and properties of polymer and their derived carbon-based aerogels, as well as their potential applications in various fields including energy storage, adsorption, thermal insulation and flame retardancy. To facilitate further research and development, the technical challenges are discussed, and several future research directions are also suggested in this review.

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Intrinsically Highly Hydrophobic Semi-alicyclic Fluorinated Polyimide Aerogel with Ultralow Dielectric Constants

Cited by 25 publications

References 20 publications

Synthesis and characterization of flexible and high-temperature resistant polyimide aerogel with ultra-low dielectric constant

Synthesis and characterization of flexible and high-temperature resistant polyimide aerogel with ultra-low dielectric constant

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

Polymer/Carbon-Based Hybrid Aerogels: Preparation, Properties and Applications

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