POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Xin Li,Zhendong Huang,Ruiyang Dou,Qiang Liu,Wei Huang,Chunxia Zhao,Jianguo Deng,Hongbing Chen
Aerogels hold great promise for various applications. However, conventional aerogels exhibit low hydrophobicity, making them prone to moisture absorption in humid environments, which adversely affects their thermal insulation and mechanical performance. In this study, we introduce an innovative approach to solve this problem by utilizing polycarbonate waste as raw materials to fabricate waterproof aerogels towards external thermal insulation. The incorporation of DOPO-MMT not only accelerates gelation and enhances mechanical strength but also imparts self-extinguishing behavior during combustion. The obtained aerogel possesses a super high static contact angle exceeding 160°, which enables the aerogel to maintain a stable thermal conductivity of 0.039 W m⁻¹ K⁻¹ even after a 7-day immersion in water. Notably, the aerogel retains its hydrophobicity under harsh conditions, including exposure to strong acids and bases. This approach of using waste materials to manufacture aerogels demonstrates the potential of recycled materials in the development of high-performance materials, offering a new technological pathway to address plastic pollution and enhance industrial energy efficiency. This method provides promising application prospects for future insulation materials, particularly suitable for fields such as construction, aerospace, and automotive industries, where high demands are placed on waterproofing, flame retardancy, and mechanical performance.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Shixian Xiong,Yue Yang,Sizhao Zhang,Yunyun Xiao,Hui Ji,Zhouyuan Yang,Feng Ding
Phenolic-based aerogel composites possess particular characteristics, such as low thermal conductivity, light weight, and superior ablative properties, in near-space vehicles. However, their machinability and flammability require further improvement, hampering their application for high-performance thermal protection systems in the aerospace field. Here, we prepare nanoporous polybenzoxazine (PBO) aerogels with outstanding thermally insulating and self-extinguishing properties by an effective-cost ambient pressure drying (APD) approach rather than a conventional high-pressure supercritical drying pattern. The PBO aerogels are prepared by adopting different exchange solvents of tert-butyl alcohol, ethanol, and n-hexane. The results obtained indicate that PBO aerogels (with n-hexane as the exchange solvent) by APD have an optimal three-dimensional nanoporous network structure, a pore size distribution in the range 20–140 nm, an obvious self-extinguishing property (extinguished itself instantly despite exposure to a 1200 °C flame), superior thermal insulation (the cold surface temperature of the sample reached only 36.4 °C after 400 s despite its opposite surface existing at a 65.8 °C atmosphere), and excellent machinable properties (easy-to-form special-shaped sample). PBO aerogels are a great potential candidate material system for thermal protection systems in aerospace applications in the future.
研究领域:
材料科学
·
航天工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qinan Hou,Yunhui Chen,Jiefei Wang,Meiqin Wu,Hou-Yong Yu,Xiaohua Wang
Polyamide 66 (PA66), a globally attractive high-performance plastic, is hindered by its poor fire resistance, which triggers excessive smoke and dripping. In this work, we introduce a novel halogen-free, thermal insulating flame-retardant for PA66, modified by cellulose nanocrystals (CNCs) with 3-aminopropyltriethoxysilane (APTES) and phosphoric acid (PA) to form a spider web-like nano composite CNC/A/P, by improving the thermal stability and inhibiting the droplet phenomenon of PA66. This high self-extinguishing flame retardant owns a 56.9 % residual carbon rate and the limiting oxygen index of 42.74 %. PA66-C15, incorporating 15 wt% CNC/A/P, significantly enhances PA66's flame retardancy, achieving a V-0 rating, and a rising LOI of 46.7 % from 21.6 %. Surprisingly, a 114.3 % temperature reduction (194.1 °C) under heating alcohol lamp were also observed in this PA66 composite, preserving superior tensile strength mechanical properties and thermal insulation. This study presents a promising, high-performance CNC-based flame-retardant material with excellent fire retardancy and mechanical properties.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Tian-Tian Huang,Kai Ning,Bin Zhao
Enhancing the fire-retardant and antibacterial properties of viscose fabric through a simple strategy is crucial and urgent. In this study, an aminoazole-based cyclotriphosphazene (HATA) was designed and synthesized through nucleophilic substitution between hexachlorocyclotriphosphazene and 3-amino-1,2,4-triazole. The application of a rapid dipping strategy and the use of 10 wt% HATA aqueous solution significantly increased the limiting oxygen index of the viscose fabric from 19.3 % to 28.4 %. In addition, the HATA-treated fabric exhibited self-extinguishing properties in vertical flame testing. The peak heat release rate of HATA-treated fabric, according to pyrolysis combustion flow calorimetry , significantly decreased by over 83 %. The scanning electron microscope images revealed the original woven fabric structure after burning. The thermogravimetric infrared spectroscopy and X-ray photoelectron spectroscopy results confirmed that the introduction HATA in viscose hindered the release of combustible gas and facilitated the formation of a protective char layer. In addition, 10 % HATA-viscose exhibited remarkable antimicrobial properties , achieving 99.96 % and 99.84 % antibacterial rates against Staphylococcus aureus and Escherichia coli , respectively. Furthermore, HATA-treated viscose fabric exhibited favorable mechanical performance, whiteness, and air permeability. This research provides a simple and effective flame-retardant and antibacterial treatment strategy for viscose fabric.
研究领域:
材料科学
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纺织工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
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IF 6.14
Ge Zhu,Hui Xu,Alain Dufresne,Ning Lin
Waste transformation as the source to valuable materials is an effective strategy for the high-valued valorization in view of socioeconomic and environmental issues. Inspired from the concept of organic–inorganic hybrid, we proposed the utilization of cellulose nanocrystals (CNCs, extracted from biomass waste) and red mud (RM, from industrial waste) to fabricate composite aerogels as potential construction materials with the multifunction of adsorption, thermal insulation, acoustic resistance, and flame retardancy. For equal loading level of modified CNC (Si-CNC) and RM (1:1, w/w) components, the obtained aerogel was chemically cross-linked with diisocyanate to enhance its structural stability and mechanical properties. It exhibited an improved compression modulus of 3.7 MPa together with high porosity (98.8%) and specific surface area (73.23 m2/g). As a result of the intrinsic features of organic Si-CNC (skeleton) and inorganic RM (particles aggregate), the Si-CNC/RM-1/c composite aerogel displayed significant functional performances such as magnetic conductivity, rapid oil adsorption of 30 times its mass, 20.8% reduction in thermal conductivity, 24.5% increase in sound-absorption coefficient, and highly efficient self-extinguishing behavior within 2 s.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Lu Lu,Jiayi Gu,Xing Wei,Zhenzhen Wei,Yan Zhao
Thermally stable separators, particularly those with a multifaceted and ultrawide range of thermal protection functions, are essential to the long-term safe operation of lithium-ion batteries (LIBs). In this work, we fabricate a sandwiched nanofibrous composite separator (PPPA) that integrates comprehensive thermal protection capacities of heat storage, shutdown, dimensional stability, and flame retardancy together, via a facile combination of coaxial-electrospinning polyacrylonitrile and poly(butylene succinate) nanofibrous membrane (PAN@PBS), spraying a mixture of poly(ethylene glycol) (PEG) and ammonium polyphosphate (APP), and folding techniques. The resultant PPPA separator is able to offer a fibrous network, high porosity, and superior electrolyte affinity. Meanwhile, the thermal protection of the PPPA separator starts with the phase-change heat storage of PEG at 60 °C. Then, the shutdown can be activated at 115 °C by the outer PBS melting of coaxial nanofibers, while the inner PAN maintains dimensional stability up to 250 °C. Further, self-extinguishing will occur in the event of fire due to the existence of APP. Moreover, PEG phase-change leakage of the composite separator can be overlooked due to the hydrogen bonds between PEG and APP and the entrapment of the upper and lower fibers. Furthermore, the PPPA separator demonstrates electrochemical performance that is on par with a commercial polyolefin separator, with higher ionic conductivity (2.49 mS cm–1) and lithium-ion transference number (0.32), as well as a cell discharge capacity retention of 92.4% after 100 cycles at 1 C. Therefore, given its excellent safety and satisfactory performance, PPPA composite separators are anticipated to be a potential separator for LIBs.
研究领域:
材料科学
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能源技术
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电化学
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产品关联
DOI
高影响因子
Batteries & Supercaps
·
2024
·Vol. 7
·期 8
·e202400118
·
IF 5.1
Xue-Tong Hu,Shuang Chen,Peng-Fei Wang,Yuhan Wu,Fa-Nian Shi,Yu-Hang Zhang
Graphical Safety is crucial for lithium metal batteries (LMBs). In this work, a self-extinguishing polymer electrolyte was obtained by introducing triethyl phosphate (TEP) with low price and high flame retardant efficiency into polyethylene oxide (PEO), and its electrochemical performance at room temperature was improved by cooperating with film forming additive fluoroethylene carbonate (FEC) and crosslinking agent tetramethylene glycol dimethyl ether (TEGDME). Most modification strategies of polyethylene oxide (PEO)-based solid polymer electrolyte focus on improving the room temperature ionic conductivity, while disregarding its inherent flammability that poses substantial safety hazard. Herein, a self-extinguishing quasi-solid-state polymer electrolyte (PTTF-SPE), which combines excellent room temperature electrochemical properties and high safety, has been developed by introducing triethyl phosphate (TEP) as a low-cost and highly effective flame retardant. The cross-linking structure derived from −CH 2 −CH 2 −O− segments of tetramethylene glycol dimethyl ether (TEGDME) and PEO makes a contribution to a high amorphous state of polymer. A robust solid electrolyte interphase (SEI) formed by preferential decomposition of fluoroethylene carbonate (FEC) that acts as a film-forming additive, which can prevent TEP from degradation at lithium metal anode. The optimized PTTF-SPE exhibits high ionic conductivity (0.54×10 −3 S/cm) and lithium transference number (0.71) at room temperature. The LiFePO 4 ||Li battery demonstrates excellent cycle life over 500 cycles at 0.5 C with a high average discharge capacity of 131 mAh/g. A symmetric Li||Li battery that operating for 850 hours indicates a good compatibility of PTTF-SPE towards lithium metal. This work provides a new idea for developing high-energy-density and high-safety lithium-metal batteries (LMBs) for room temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jun Lu,Lixiang Yi,Juanjuan Su,Jian Han
The highly efficient bio-based flame retardant with favorable interfacial compatibility is crucial for a polylactic acid (PLA) composite with well-balanced flame retardant and mechanical properties. In this study, a highly efficient flame retardant TPBC, hybridizing with 3-aminobenzeneboronic acid (3-ABBA), phytic acid (PA), chitosan (CS) and isocyanuric acid triglycidyl ester (TGIC), was prepared by aqueous green one-pot method. TGIC promotes uniform dispersion of the flame retardant and robust interfacial adhesion by lowering the interfacial tension and the reaction of the epoxy functional groups with the PLA terminal groups. PLA composite containing only 3 wt% TPBC exhibits a LOI value of 29.5 %, achieving the desired UL-94 V-0 rating, excellent self-extinguishing performance and a significant reduction in melting droplets. Meanwhile, the mechanical strength of 3 %TPBC-PLA is notably strengthened to be 58.1 MPa due to the boosted interfacial compatibility and the enhanced crystallinity of 21.6 %. Furthermore, the UV protection factor (UPF) of 3 %TPBC-PLA is raised to 74.7, which shows good UV shielding ability. The present work opens up a great promise for the application of the flame retardant PLA composites with high mechanical performance.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Huali Xie,Xiuyuan Lin,Jieming Zhang,Xuejun Lai,Kunquan Li,Xiaojing Su,Yunhui Wu,Xiaofan Zhang,Wenjian Wu
Organic thermoelectric materials demonstrate significant application potential for remote temperature monitoring during the fire incubation period and early fire-warning. Nevertheless, their low thermoelectric efficiency compromises the sensitivity, reliability and accuracy of sensing signal. Herein, heterogeneous thermoelectric nanowires (HTN) and thermoelectric graphene (TEG) were synthesized, and they were subsequently co-assembled to construct a thermoelectric nanocoating featuring multiple heterostructure and ordered layered structure. Thanks to the synergistic effect of the two structures, the thermoelectric-response temperature-sensing of the nanocoating demonstrated exceptional sensitivity, accuracy, and stability. The nanocoating swiftly triggered a fire-warning within 1.3 s upon exposure to flame, and even in the event of secondary burning, the fire-warning trigger time was only extended to 1.5 s. The output voltage of the nanocoating exhibited a precise and repeatable linear functional relationship (U = 0.0248 T-0.779) within the temperature range of 50–300 °C, enabling remote real-time temperature monitoring when integrated with a wireless signal transmitter. Moreover, the ordered layered structure endowed the nanocoating with excellent flame-retardancy, enabling it to self-extinguish during the flame-retardant tests. Thus, this thermoelectric nanocoating opened a new pathway for intelligent fire safety protection of flexible electrical materials.
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Mingjie Guo,Ying Pan,Wei Wang,Lulu Xu,Yan Zhang,Haifeng Pan,Shaodan Xu,Dihua Wu,Dong Zhang,Suling Zhang,Ting Lü,Hongting Zhao
This study proposes a bioinspired char-forming architecture to develop fire-safe transparent wood. This is achieved by synergistically incorporating phosphorylated cellulose (PC) into wood aerogels. The incorporation of PC enhances the flame retardancy of polyurethane acrylate (PUA) composites. The PC was synthesized through phosphorous acid modification of microcrystalline cellulose and then uniformly distributed within delignified wood aerogels. These aerogels were subsequently impregnated with UV-curable PUA resin to produce transparent wood structures. The PC-modified wood exhibited excellent flame-retardant properties, including self-extinguishing behavior and the formation of continuous, thermally stable char layers during combustion. Structural and chemical characterizations using FTIR, XPS, SEM, and elemental mapping confirmed successful integration of PC into the wood matrix. Thermal analysis (TGA) and micro-scale combustion calorimetry showed a significant reduction in peak heat release rate (pHRR) (by 42 %) and an increase in char yield (up to 36 wt%). Phosphorylated cellulose-functionalized wood aerogels endowed PUA composites with 26 % lower pHRR and 25 % reduced total heat release (THR) via char-formation-dominated flame-retardant mechanisms. Importantly, the modified transparent wood retained high optical transmittance (∼50 %) and mechanical strength (∼30 MPa tensile strength), making it suitable for multifunctional applications. To better understand the flame-retardant mechanism, molecular dynamics simulations were conducted, demonstrating the barrier role of the char layer in suppressing the release of flammable gases.
研究领域:
材料科学
·
高分子复合材料
·
阻燃材料
·
生物质材料
·
绿色建筑材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Haoran Jiang,Yong Hu,Wu Xu,Ziwen Dong,Song Kong
Cellulose-based paper, widely used in cultural heritage preservation and art, suffers from inherent flammability. Conventional phosphorus-based flame retardants, derived from depleting phosphate ores, necessitate sustainable alternatives. This study introduces an innovative layer-by-layer assembly strategy to fabricate biomass-derived MH-P@Mn and MH-P@Ni core-shell flame retardants. Phytic acid, a biogenic phosphorus source, chelates metal ions (Mn 2+ /Ni 2+ ) to form stable coatings on magnesium hydroxide. When applied to cellulose paper, these materials exhibit superior flame-retardant performance compared to commercial phosphorus-based counterparts, particularly at medium-to-high loadings. Mechanistically, they enhance inert gas emission during pyrolysis, delaying thermal degradation. The mild, rapid synthesis enables development of eco-friendly, multifunctional cellulose paper with enhanced fire resistance and sustainable phosphorus utilization, promising diverse applications.
研究领域:
材料科学
·
化学工程
·
高分子科学
·
消防安全工程
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Fengdong Teng,Ying Yuan,Na Li,Shubin Song,Junrong Yu,Yan Wang,Zuming Hu
The synergistic integration of mechanical robustness with multifunctionality remains a critical challenge in flexible shielding materials. Here, a molecular engineering strategy using para -aramid (PPTA) prepolymers as reactive monomers in an NMP/CaCl 2 composite solvent system was introduced, through which high-molecular-weight PPTA (HMW-PPTA) solutions with an inherent viscosity of 4.1 dL·g −1 were synthesized via controlled secondary polymerization. Scalable blade-coating synergized with molecular assembly enabled rapid processing of these solutions into films exhibiting a tensile strength of 278.5 MPa, elongation at break of 14.3 %, and toughness of 23.5 MJ·m −3 . Hydrogen-bond-mediated in situ polymerization of conductive polypyrrole (PPy) on PPTA substrates yielded multifunctional PPTA-PPy (PAP) composite films. Dynamic interfacial interactions and nanoparticle-enabled defect repair synergistically enhanced the tensile strength and toughness of the optimized PAP (PAP-15) films to 311.4 MPa and 32.4 MJ·m −3 , respectively, alongside a high electrical conductivity of 1510 S·m −1 . Leveraging this conductivity, PAP-15 films achieve multifunctional integration, including 28.3 dB (8201 dB·cm 2 ·g −1 ) electromagnetic interference shielding effectiveness in the X-band, rapid Joule heating to 134 ℃ within 10 s at 5 V, and self-extinguishing behavior. This work establishes a universal platform for scalable production of high-performance PPTA-based flexible composites, overcoming traditional mechanical-functional trade-offs in shielding materials.
研究领域:
材料科学
·
高分子化学
·
纳米技术
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电磁屏蔽
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）