Multifunctional Organic–Inorganic Hybrid Aerogel for Self‐Cleaning, Heat‐Insulating, and Highly Efficient Microwave Absorbing Material

Wang, Yongdong; Liu, Xiaofang; Nie, Xiaoyu; Yang, Wenwen; Wang, Yidong; Yu, Rong; Shui, Jianglan

doi:10.1002/adfm.201807624

Cited by 478 publications

(265 citation statements)

References 75 publications

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“…Ma 1,2 , J-J. Qiu 1 , C-M. Liu 1* have been studied [30][31][32][33][34]. However, most benzoxazine resins appear as high melting point powders, and organic solvents [35] are always needed when preparing benzoxazine composites.…”

Section: Introductionmentioning

confidence: 99%

Low melting point, high thermal stable branched benzoxazines resin derived from mixed-substituted phosphazene core

Ma¹,

Qiu²,

Liu³

2020

Express Polym. Lett.

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Six fluorine-containing, mix-substituted phosphazene-based branched benzoxazine monomers with a low melting point were successfully prepared and their chemical structures were verified by 1 H, 13 C, 31 P and 19 F nuclear magnetic resonance (NMR). These branched benzoxazine resins underwent thermal ring-opening polymerization to form cured polymers with high thermal stability both in N 2 atmosphere and in air. The co-substituents, both m-CF 3 PhOH and p-CF 3 PhOH, imposed significant effects on processing, thermal, and surface properties of corresponding polybenzoxazines. Non-isothermal differential scanning calorimetry (DSC) under diverse heating rates was adopted to investigate the curing kinetics and determine the activation energy of polymerization. DSC results indicate that the m-CF 3 PhO-/p-CF 3 PhO-groups have the potential to lower ring-opening polymerization temperature. Glass transition temperatures (T g s) of polybenzoxazines derived from p-CF 3 PhOH are higher than that of polymers derived from m-CF 3 PhOH due to different steric hindrance and crosslinking density. More interesting, all polybenzoxazines show relatively high dielectric constant but exhibit low dielectric loss at ambient temperature.

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Section: Introductionmentioning

confidence: 99%

Low melting point, high thermal stable branched benzoxazines resin derived from mixed-substituted phosphazene core

Ma¹,

Qiu²,

Liu³

2020

Express Polym. Lett.

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“…Thirdly, the abundant interfaces between CNFs and SiOC play a vital role in boosting the interfacial polarization [39]. Fourthly, the cross-linked CNFs can provide a continuous transport path for free electrons, which is favorable for enhancing the conductive loss [26,40]. The proper impedance matching of HPSCs reveals that more microwave can propagate into absorbers, and thus, more electromagnetic energy can be dissipated and converted into heat or other energy.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

et al. 2020

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The hierarchical porous SiOC ceramics (HPSCs) have been prepared by the pyrolysis of precursors (the mixture of dimethicone and KH-570) and polyacrylonitrile nanofibers (porous template). The HPSCs possess hierarchical porous structure with a BET surface area of 51.4 m 2 /g and have a good anti-oxidation property (only 5.1 wt.% weight loss). Owing to the porous structure, the HPSCs deliver an optimal reflection loss value of − 47.9 dB at 12.24 GHz and an effective absorption bandwidth of 4.56 GHz with a thickness of 2.3 mm. The amorphous SiOC, SiO x , and free carbon components within SiOC make contributions to enhancing dipolar polarization. Besides, the abundant interfaces between SiOC and carbon nanofibers (CNFs) are favorable for improving interfacial polarization. The conductive loss arisen from cross-linked CNFs can also boost the microwave absorption performance.

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“…Aerogels are ultralight materials with porous structure that are produced by replacing the liquid component in the gel by gas. Due to their fascinating characteristics such as low density, light weight, high specific surface areas, and high porosity, aerogels are now regarded as the most promising solid material and are widely applied as pollutants sorbents for environmental remediation applications, piezoresistive sensors, catalyst supports, fire retardants, supercapacitors, microwave absorbing materials, and so on. Based on their components, aerogels are classified as molecular aerogels, inorganic aerogels, and organic aerogels .…”

Section: Compressive Properties and Shape Memory Performance Of The Cmentioning

confidence: 99%

“…Due to their fascinating characteristics such as low density, light weight, high specific surface areas, and high porosity, aerogels are now regarded as the most promising solid material and are widely applied as pollutants sorbents for environmental remediation applications, piezoresistive sensors, catalyst supports, fire retardants, supercapacitors, microwave absorbing materials, and so on. Based on their components, aerogels are classified as molecular aerogels, inorganic aerogels, and organic aerogels . In fact, the traditional inorganic silica aerogel is very brittle, while comparatively, the organic aerogels, particularly those derived from various polymers (e.g., polyimides, polyamides, polyurethanes, and biomacromolecules) exhibit strong advantages in providing diverse mechanical properties, such as varying from stiff to high elasticity to enable adaption to a wide range of demands.…”

Section: Compressive Properties and Shape Memory Performance Of The Cmentioning

confidence: 99%

Fabrication of Shape‐Memory Aerogel Based on Chitosan/Poly(ethylene glycol) Diacrylate Semi‐Interpenetrating Networks via a Facile and Eco‐Friendly Strategy

Xiao

et al. 2019

Macro Materials & Eng

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exhibit strong advantages in providing diverse mechanical properties, such as varying from stiff to high elasticity to enable adaption to a wide range of demands.While the application of aerogels in smart materials has attracted increasing attention, ensuring full functionality in a porous structure is still highly challenging. As one of the booming smart materials, shape-memory polymers (SMPs) have been intensively investigated, and numerous multiresponsive, [20][21][22][23][24][25] multifunctional shape memory polymeric bulk materials [26][27][28][29] or hydrogels [30][31][32][33][34][35] have been developed. However, to the best of our knowledge, there have been very few reports about shape memory aerogels. [36,37] Rowan and coworkers [38] developed a thermal responsive shape memory aerogel from a thiol-ene network with a glass temperature above room temperature, and showed that it displays very good shape memory performance. However, this shape memory aerogel is produced from an organogel. Generally, fabricating aerogels from hydrogels is a more economical and eco-friendly strategy.Herein, we seek to develop a shape memory polymeric aerogel (SMPA) from the corresponding hydrogel via an eco-friendly strategy by choosing water soluble and highly matchable constituent materials. It is well-known that crystalline poly(ethylene glycol) (PEG) with a melting temperature (T m ) above room temperature is a favorable component for the development of thermally induced SMPs, and its water solubility makes it a good candidate for SMPA. However, the aerogel formed from a single highly crystalline PEG component will show a poor mechanical performance. To address this problem, we considered chitosan (CS) which is a biobased material derived from sustainable resources. CS is obtained by deacetylation of chitin and its physicochemical properties are determined by the degree of deacetylation and molecular weight. [39] It was identified as a good start material for fabricating aerogels with unique advantages, such as good flexibility, nontoxicity, cost-effectiveness and biodegradability. Thus, CS was chosen as the other precursor material to enhance the aerogel skeleton. In this work, we prepared a shape memory aerogel based on chitosan/poly(ethylene glycol) diacrylate (CS/PEGDA) semi-interpenetrating networks (semi-IPNs) via a facile one-pot photocrosslinking approach. The feed ratio of CS and diacrylic PEG (PEGDA) precursors with different molecular weights were tuned to Shape-Memory Aerogels While the field of shape memory polymers (SMPs) has developed rapidly, it is still highly challenging to obtain SMPs in the form of aerogels (SMPAs) due to the unique technique used for the fabrication of the aerogels and their high porosity. Herein, a thermally induced SMPA based on chitosan/poly(ethylene glycol) diacrylate (CS/PEGDA) semi-interpenetrating networks is reported that are produced using an eco-friendly strategy. The main network is responsible for the shape memory effect (SME) and can be easily tuned by varying the feed rat...

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Multifunctional Organic–Inorganic Hybrid Aerogel for Self‐Cleaning, Heat‐Insulating, and Highly Efficient Microwave Absorbing Material

Cited by 478 publications

References 75 publications

Low melting point, high thermal stable branched benzoxazines resin derived from mixed-substituted phosphazene core

Low melting point, high thermal stable branched benzoxazines resin derived from mixed-substituted phosphazene core

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

Fabrication of Shape‐Memory Aerogel Based on Chitosan/Poly(ethylene glycol) Diacrylate Semi‐Interpenetrating Networks via a Facile and Eco‐Friendly Strategy

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