Facile fabrication of multifunctional flame retardant epoxy resin by a core–shell structural AgNC@boronate polymer

Xia, Long; Miao, Zhongxi; Dai, Juguo; Zhu, Aoqi; Xu, Hui; Zhong, Jiahui; Chen, Yang; Luo, Weiang; Xu, Yiting; Yuan, Conghui; Zeng, Birong; Cao, Hesheng; Dai, Lizong

doi:10.1016/j.cej.2022.135402

Cited by 59 publications

(8 citation statements)

References 48 publications

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“…To improve the conductive property for high performance EMI shielding applications, AgNP is an excellent material due to its high conductive nature, and it can also prevent heat buildup in specific positions of the composite. 22 Although AgNP-based materials have previously been reported in EMI shielding materials, 23−25 it has limitations, as it can oxidize when exposed to air if there is no protection in the AgNP-based film. 26 Therefore, further improvement is needed for developing Ag-based EMI shielding materials.…”

Section: Introductionmentioning

confidence: 99%

“…For those reasons, hydrogel-based materials have not been used much so far for EMI shielding applications. To improve the conductive property for high performance EMI shielding applications, AgNP is an excellent material due to its high conductive nature, and it can also prevent heat buildup in specific positions of the composite . Although AgNP-based materials have previously been reported in EMI shielding materials, − it has limitations, as it can oxidize when exposed to air if there is no protection in the AgNP-based film .…”

Section: Introductionmentioning

confidence: 99%

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Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Paria

Bera

et al. 2022

ACS Appl. Eng. Mater.

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Smart electromagnetic interference (EMI) shielding materials with tunable EMI shielding effectiveness (SE) have garnered huge attention in the fabrication of next generation EM devices as well as innovative wearable electronics. Here, we report a polydimethylsiloxane (PDMS) encapsulated soft, flexible, and stretchable polyacrylamide (PAM)-alginate (Alg)-hydrogel/silver nanorod (AgNR) composite system for EMI SE application. The PDMS encapsulation not only enhances the tensile strength of the system from ∼0.057 MPa to ∼0.724 MPa but also restricts the evaporation of water from the hydrogel matrix. Consequently, at 14.5 GHz frequency, the EMI SE (∼48.72 dB) of the hydrogel was reduced to ∼10.52 dB (72 h at 30 °C) and ∼6.44 dB (72 h at 40 °C) and ∼8.03 dB after 1 week of settlement at ambient conditions. However, for the encapsulated hydrogel, the EMI SE (∼40.65 dB) value was marginally reduced to ∼33.86 dB, ∼31.45 dB, and ∼32.42 dB, respectively, under the same conditions. Moreover, by changing the sample thickness (increasing holding pressure in a VNA sample holder), the shielding performance can be altered from ∼48.72 to ∼53.63 dB for the hydrogel and from ∼40.65 to ∼44.03 dB for the encapsulated hydrogel. Thus, these findings provide an innovative strategy to fabricate a flexible and stretchable EMI shielding material with adjustable SE by varying the content of water and applying pressure for futuristic development in smart electronics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Paria

Bera

et al. 2022

ACS Appl. Eng. Mater.

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“…[12] Thus, it presents a challenge to concurrently enhance the fire safety and mechanical properties of EP composites. [13] Many researchers reported that the introduction of other flame-retardant groups (e.g., Schiff base, triazole, and so on) into the DOPO system is greatly beneficial to further improve the flame-retardant efficiency of FR due to the synergistic effect. [14,15] Schiff bases exhibit great thermal stability and charring properties, which can enhance the fire safety of EPs.…”

Section: Introductionmentioning

confidence: 99%

“…[ 12 ] Thus, it presents a challenge to concurrently enhance the fire safety and mechanical properties of EP composites. [ 13 ]…”

Section: Introductionmentioning

confidence: 99%

A High‐Efficient DOPO‐Based Flame Retardant as a Co‐Curing Agent for Simultaneously Enhancing the Fire Safety and Mechanical Properties of Epoxy Resin

Lian

et al. 2023

Macromol. Rapid Commun.

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Simultaneously enhancing the fire safety and mechanical properties of epoxy resin (EP) remains a persistent challenge. Herein, a high‐efficient phosphaphenanthrene‐based flame retardant (FNP) is synthesized using 3,5‐diamino‐1,2,4‐triazole, 4‐formylbenzoic acid, and 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide. Due to the presence of active amine groups, FNP is employed as a co‐curing agent for fabricating EP composites with outstanding fire safety and mechanical properties. EP containing 8 wt% FNP (EP/8FNP) achieves a vertical burning (UL‐94) V‐0 rating with a limiting oxygen index of 31%. Meanwhile, FNP declines the peak heat release rate, total heat release, and total smoke release of EP/8FNP by 41.1%, 31.8%, and 16.0%, respectively, compared to those of unmodified EP. The increased fire safety of EP/FNP composites is because FNP promotes the formation of an intumescent, compact, and cross‐linking char layer for EP/FNP composites, and releases P‐containing substances and noncombustible gases in the gas phase during combustion. In addition, EP/8FNP exhibits 20.3% and 5.4% increase in the flexural strength and modulus compared with those of pure EP. Furthermore, FNP enhances the glass transition temperature of EP/FNP composites from 141.6 °C for pure EP to 147.3 °C for EP/8FNP. Therefore, this work is conducive to the future development of fabricating fire‐safe EP composites with enhanced mechanical properties.

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“…Nowadays, ame-retardant epoxy resin composites are rapidly developed so as to meet the high re-safety requirements. [4,5] For the commercial ame-retardant epoxy resin composites, both organic phosphorous ame retardants, such as DOPO and DOPO-derives, [6,7] and inorganic ame retardants, such as ATH and ammonium polyphosphate (APP), etc. [8,9] are used to enhance the re performance of epoxy resin composites.…”

Section: Introductionmentioning

confidence: 99%

Facile Constructing Inorganic Phosphorus/boron-layered Double Hydroxide Complexes for Highly Efficient Fire-safety Epoxy Resin

Shao

Wang

Song

et al. 2022

Preprint

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Concerning inorganic flame retardants, the facile fabrication and high-efficiency fire safety without compromising the mechanical property of matrix are still significant challenges. Here, nano-layered double hydroxide containing boron constructed on the surface of ammonium polyphosphate complexes (B-LDH@APP) is prepared by a simple in-situ coprecipitation technology to reduce the fire hazard and improve mechanical performances of epoxy resin (EP). The as-obtained 4B-LDH@APP/EP achieves the UL-94 V-0 rating and presents superior flame-safety performance. With respect to the 4APP/EP, the fire growth rate, the peak heat release rate, and the peak smoke production rate of 4B-LDH@APP/EP decrease by 77.8%, 57.3%, and 52.6%, respectively. The reason is mainly contributed to excellent synergistic flame-retardant effect among boron, LDH, and APP, which can accelerate the generation of compact charring residual with good microstructure during combustion of B-LDH@APP/EP composites. Furthermore, B-LDH@APP slightly affects the mechanical performances of EP matrix due to the upgraded interfacial interaction.

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Facile fabrication of multifunctional flame retardant epoxy resin by a core–shell structural AgNC@boronate polymer

Cited by 59 publications

References 48 publications

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

Elastomer Encapsulated Silver Nanorod Dispersed Polyacrylamide-Alginate Hydrogel for Water-Pressure-Dependent EMI Shielding Application

A High‐Efficient DOPO‐Based Flame Retardant as a Co‐Curing Agent for Simultaneously Enhancing the Fire Safety and Mechanical Properties of Epoxy Resin

Facile Constructing Inorganic Phosphorus/boron-layered Double Hydroxide Complexes for Highly Efficient Fire-safety Epoxy Resin

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