An “OFF-to-ON” shape memory polymer conductor for early fire disaster alarming

Jia, Jichen; Gao, Naiwei; Li, Ruiting; Liao, Shenglong; Lyu, Sang Woo; Wang, Yapei

doi:10.1016/j.cej.2021.133285

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…Later, other FAS systems have been gradually designed and developed, such as color-changing molecular sensor [16], phase-changing/shape-changing sensors [17,18] and thermoelectric sensors [19][20][21]. Therefore, a variety of fire sensor materials are designed, fabricated and employed, e.g., carbon nanotube, graphene derivatives, metal oxide, MXene, nanocarbon black, chitosan and other biomass-based materials [22][23][24][25][26][27][28][29][30]. Overall, both above FAS show satisfying fire warning performance, e.g., for most reported works, a desirable flame response time of < 5 s can be obtained, which is superior to existing commercial fire alarm devices, e.g., smoke and infrared detectors with a > 100 s fire response time [31,32].…”

Section: Introductionmentioning

confidence: 99%

Fire Intumescent, High-Temperature Resistant, Mechanically Flexible Graphene Oxide Network for Exceptional Fire Shielding and Ultra-Fast Fire Warning

et al. 2022

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Smart fire alarm sensor (FAS) materials with mechanically robust, excellent flame retardancy as well as ultra-sensitive temperature-responsive capability are highly attractive platforms for fire safety application. However, most reported FAS materials can hardly provide sensitive, continuous and reliable alarm signal output due to their undesirable temperature-responsive, flame-resistant and mechanical performances. To overcome these hurdles, herein, we utilize the multi-amino molecule, named HCPA, that can serve as triple-roles including cross-linker, fire retardant and reducing agent for decorating graphene oxide (GO) sheets and obtaining the GO/HCPA hybrid networks. Benefiting from the formation of multi-interactions in hybrid network, the optimized GO/HCPA network exhibits significant increment in mechanical strength, e.g., tensile strength and toughness increase of ~ 2.3 and ~ 5.7 times, respectively, compared to the control one. More importantly, based on P and N doping and promoting thermal reduction effect on GO network, the excellent flame retardancy (withstanding ~ 1200 °C flame attack), ultra-fast fire alarm response time (~ 0.6 s) and ultra-long alarming period (> 600 s) are obtained, representing the best comprehensive performance of GO-based FAS counterparts. Furthermore, based on GO/HCPA network, the fireproof coating is constructed and applied in polymer foam and exhibited exceptional fire shielding performance. This work provides a new idea for designing and fabricating desirable FAS materials and fireproof coatings.

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Section: Introductionmentioning

confidence: 99%

Fire Intumescent, High-Temperature Resistant, Mechanically Flexible Graphene Oxide Network for Exceptional Fire Shielding and Ultra-Fast Fire Warning

et al. 2022

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“…Actuators that could respond to external stimuli are essential components in intelligent devices, and attractive for various applications in the fields of energy, biomedicine, and robotics. [17][18][19] As one of the most common structures, bilayer polymeric actuators are developed with diverse smart polymeric materials, including gels, [20] liquid crystal polymer, [1][2][3] shape memory polymer, [5,21,22] which could respond to temperature, [23][24][25] light, [24] and moisture. [26,27] Though they could facilitate the protection of overloaded stimuli and keep safety, challenges are obvious for the preparation of actuators with overload protection since most smart materials could only respond positively or negatively to a single stimulus.…”

Section: Introductionmentioning

confidence: 99%

Bilayer Actuator with Overload Protection on the Basis of Semicrystalline Polyurethane

Zhang

Mao

Zheng

et al. 2023

Macromol. Rapid Commun.

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Response to external stimuli plays a significant role in the environmental adaptation of living matters and intelligent devices. Most stimulus–response systems in nature can respond to appropriate stimuli, and inhibit the response under excessive stimuli, such as excessive heat or water, which can be called overload protection. However, even though various responsive materials have been developed for different stimuli, most of them are not protective against the overload stimuli. In this work, a bilayer actuator based on semicrystalline polyurethane is designed, which can respond differently to proper stimuli and excessive stimuli, i.e., water. This actuator can bend gradually under the proper stimulation of water, but will straighten and even bend reversely with excessive stimulation. The mechanism behind the reversible and adjustable actuator with overload protection is investigated both experimentally and theoretically, and the competition between dynamic factors and thermodynamic stability in the swelling process is considered the main cause.

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“…Recently, diverse emerging FAS systems were developed and reported based on different alarming mechanisms, e.g., resistance transition, 16−22 thermal-electric conversion, 23−25 shape/phase change, 26,27 and color-change. 28,29 For instance, Tang's group creatively designed and achieved a smart early fire alarm sensor on combustible substrates via using a multilayered graphene oxide (GO)/silicone coating.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, diverse emerging FAS systems were developed and reported based on different alarming mechanisms, e . g ., resistance transition, − thermal-electric conversion, − shape/phase change, , and color-change. , For instance, Tang’s group creatively designed and achieved a smart early fire alarm sensor on combustible substrates via using a multilayered graphene oxide (GO)/silicone coating . Due to the thermal reduction mechanism, once encountering the flame, the GO network can transform into rGO network and thus form a conductive path for the alarming circuit within ∼3 s. Meanwhile, the silicon resin can transform into a nanosilica protective layer to restrict the thermal decomposition of the rGO network.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic, Mechanically Strong Supramolecular Nanosystem Enabling Solvent Resistance, Reliable Fire Protection and Ultralong Fire Warning

et al. 2022

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A graphene oxide (GO)-based smart fire alarm sensor (FAS) has gained rapidly increasing research interest in fire safety fields recently. However, it still remains a huge challenge to obtain desirable GO-based FAS materials with integrated performances of mechanical flexibility/robustness, harsh environment-tolerance, high-temperature resistance, and reliable fire warning and protection. In this work, based on bionic design, the supermolecule melamine diborate (M·2B) was combined with GO nanosheets to form supramolecular cross-linking nanosystems, and the corresponding GO-M·2B (GO/MB) hybrid papers with a nacre-like micro/nano structure were successfully fabricated via a gel-dry method. The optimized GO/MB paper exhibits enhanced mechanical properties, e.g., tensile strength and toughness up to ∼122 MPa and ∼1.72 MJ/m3, respectively, which is ∼3.5 and ∼6.6 times higher than those of the GO paper. Besides, it also shows excellent structural stability even under acid/alkaline solution immersion and water bath ultrasonication conditions. Furthermore, due to the presence of promoting reduction effect and atom doping reactions in GO network, the resulting GO/MB network displays exceptional high-temperature resistance, sensitive fire alarm response (∼0.72 s), and ultralong alarming time (>1200 s), showing promising fire safety and protection application prospects as desirable FAS and fire shielding material with excellent comprehensive performances. Therefore, this work provides inspiration for the design and fabrication of high-performance GO-based smart materials that combine fire shielding and alarm functions.

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An “OFF-to-ON” shape memory polymer conductor for early fire disaster alarming

Cited by 26 publications

References 56 publications

Fire Intumescent, High-Temperature Resistant, Mechanically Flexible Graphene Oxide Network for Exceptional Fire Shielding and Ultra-Fast Fire Warning

Fire Intumescent, High-Temperature Resistant, Mechanically Flexible Graphene Oxide Network for Exceptional Fire Shielding and Ultra-Fast Fire Warning

Bilayer Actuator with Overload Protection on the Basis of Semicrystalline Polyurethane

Biomimetic, Mechanically Strong Supramolecular Nanosystem Enabling Solvent Resistance, Reliable Fire Protection and Ultralong Fire Warning

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