JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12836-12847
·
IF 3.553
Zhu Zongmin,Lin Panlong,Wang Hao,Wang Luoxin,Yu Bin,Yang Feihua
Abstract In order to improve the flame retardancy and smoke suppression of epoxy resin (EP) simultaneously, we synthesized a melamine phenylhypophosphonate named as MABP via a simple one-step method and used it to modify EP materials. As expected, the addition of MABP not only largely improved the flame retardancy but also restrained the smoke release of EP. For details, when the content of MABP was 10 wt%, the EP composite possessed a limiting oxygen index value of 33% and achieved to a UL-94 V-0 rating as well as its PHRR, THR and TSP values decreased by 55.1%, 27.1% and 60% compared with that of neat EP, respectively. In addition, the flame-retardant mechanism was investigated by multiple instruments, and the corresponding results exhibited that the MABP could improve the compactness of char layer in condense phase and exerted fire-inhibition effect in gaseous phase. Graphic abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Lin Peng,Xu Yuchen,Hou Junfeng,Zhang Xiaochun,Ma Lingfei,Che Wenbo,Yu Youming
Bamboo is a rich natural resource in the Asia Pacific, and it is widely used in the construction and decoration industry. Meanwhile, bamboo is an extremely combustible natural polymer material. Herein, the bamboo slices were treated with melamine and phytic acid using layer-by-layer (LBL) assembly technology to improve their flame retardancy properties. The morphology and chemical composition of untreated and treated bamboo slices were measured by scanning electron microscopy equipped with energy dispersive X-ray analysis and Fourier transform infrared spectra. The results showed that two-dimensional melamine–phytate (MP) nanoflakes were successfully formed and deposited on the bamboo surface. The deposition of the MP coating caused the earlier degradation of the bamboo to form char, according to thermogravimetric analysis. The peak heat release rates of the treated bamboo slices were reduced by more than 28% compared to those of the untreated ones. The MP coating promoted the formation of thermally stable char, which was responsible for the significant improvement in flame retardancy. Besides, the char layer with excellent thermal resistance performed a vital role in suppressing flame spread.
研究领域:
材料科学
·
生物质资源利用
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hanqi Qian,Yue Yao,Qingyuan Cao,Tao Liu,Nan Li,Yudong Huang,Regina Maratovna Islamova,Bo Jiang
Developing coating materials, which are thermally insulating and high-strength support in extreme environments, is a hot spot for the thermal protection of aerospace. However, the lack of stable ceramic construction after prolonged thermal attack creates a risk of mechanical performance degradation. Herein, a silicon-based porous thermal protection composite was proposed by enveloping an innovative silicone resin on melamine frame. The thermostability of silicone resin was significantly improved by just 2 wt% addition of a multifunctional silane monomer, due to the incorporated diphenylamine and its derived quinonimine structure. Meanwhile, the uniform distribution of ammonium polyphosphate (APP) in the system effectively filled defects and cracks during pyrolysis. These facilitated the formation of an ordered porous polymer-derived ceramic framework under high temperature, thus significantly enhancing the material's mechanical strength (1200 °C, 3.39 MPa) and thermal insulation. Notably, even when subjected to prolonged high-temperature flame impact, the 3 mm-thick quinonimine-incorporated coating maintained its intact structure and preserved a backside temperature 77 °C lower than that of traditional silicone/melamine coating. This work provides a strategy for developing thermal protection composites that exhibit machinability, high strength, and superior thermal insulation performance in extreme environments.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Jinhui Huang,Wenjian Cheng,Yahui Shi,Guangming Zeng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
A metal-free modified carbon nitride MCU(DMSO)-C 3 N 4 (3:3:1) with a honeycomb-like morphology was prepared via firstly introducing cyanuric acid and urea into melamine in dimethyl sulfoxide (DMSO) as the precursor for the MCU-C 3 N 4 . A variety of characterization methods, including XRD, XPS, FT-IR, SEM, TEM , UV–vis, photoluminescence (PL), and photocurrent generation, were applied to investigate the structure, morphology, optical, and photoelectrochemical properties of the g-C 3 N 4 and MCU-C 3 N 4 (3:3:1). Rhodamine B (RhB), methylene blue (MB), and bisphenol A (BPA) were selected as target pollutants to evaluate photocatalytic activity of the MCU-C 3 N 4 (3:3:1) under visible light irradiation. MCU-C 3 N 4 (3:3:1) exhibits significantly enhanced photocatalytic activity compared with g-C 3 N 4 , where 99.49% RhB is removed within 40min, 97.7% MB is removed within 80 min, and 84.37% BPA is removed within 90 min. The improved photodegradation efficiency was mainly due to the larger surface area, the stronger REDOX ability, and the increased separation efficiency of photogenerated electron-hole pairs. The active radical trapping experiments and electron spin resonance tests indicated that h + and O 2 − radicals were the dominant active species whereas OH radicals could be a minor factor. A possible photocatalytic mechanism is proposed. This strategy here provides an ideal platform for the design of photocatalysts with large surface area and high porosity for various pollutant controlling applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Cai,Bicheng Lin,Liangyuan Qi,Tianyang Cui,Zhaoxin Li,Junling Wang,Sicheng Li,Chengfei Cao,Mohammad Ziaur Rahman,Xin Hu,Rujun Yu,Shuo Shi,Weiyi Xing,Yuan Hu,Jixin Zhu,Bin Fei
Even though significant advantages in the energy-free regulation of temperature are presented, the practical applications of radiative cooling materials in buildings and human surfaces still involve many safety issues, especially for fire hazards of polymer-based materials. Meanwhile, renewable and environmentally friendly materials are urgently needed to develop suitable radiative cooling materials with no adverse environmental impact. Herein, a chitosan-derived composite aerogel film with high solar reflection provided by the addition of melamine-phytic acid (MA/PA) hybrids is designed and prepared, presenting radiative cooling and fireproof performances. The instinct deep-yellow color of chitosan (CS) is successfully shielded by high-reflective MA/PA hybrids, while IR emissivity of up to 90.4 % and solar reflectivity of ∼ 89.3 % are achieved. In outdoor environments, this composite aerogel shows sub-ambient temperature drops of ∼ 4.3 °C and ∼ 3.1 °C in cloudless and cloudy weather, presenting a robust cooling effect. In addition, CS-MA/PA composite aerogel film with 3 mm thickness can isolate the fire of ∼ 500 °C, showing superior fire safety attributed to the synergistic flame retardant effects among chitosan, phytic acid, and melamine, which suppress the initial growth of fire and promote the rapid formation of protective char layer. This work provides a bio-based, fire-safe, and radiative cooling material to decrease the energy consumption of temperature regulation with a more environmentally friendly and safer approach, further promoting the practical application of radiative cooling materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Baocheng Ji,Lanrui Yang,Mengxian Zhang,Peiyu Li,Zhuchen Hou,Jia Lv,Xu Xu,Wenbao Bi,Gaigai Xu,Yanhong Bai
In this study, a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method based on two kinds of silanized melamine sponges coupled with ultra-high liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) were developed for the determination of multiple pesticides and veterinary drugs in honey. Quick and convenient matrix separation could be achieved with the developed silanized melamine sponges by simply soaking and squeezing. At three spiked levels, all recoveries of the monitored drugs ranged from 63.6% to 114.8%, with relative standard deviations less than 17.7%. No significant matrix influence was observed with matrix effects within −13.9%∼+15.1% for all monitored drugs. Good linearity with correlation coefficient (R 2 ) ≥0.991 was obtained in the range of 0.08–100 μg kg −1 for most drugs. The limits of detection and quantification ranged from 0.04 to 3.6 μg⋅kg −1 and from 0.08 to 9.8 μg⋅kg −1 , respectively. The results had shown the satisfactory matrix purification performance of silanized melamine sponges and indicated its good application prospect in the multiple determination of pesticides and veterinary drugs in various foods.
研究领域:
食品科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11624-11630
·
IF 7.443
Zhonghua Chen,Jianchuan Wang,Fei Yu,Zhengguo Zhang,Xuenong Gao
A novel kind of graphene oxide-modified poly(melamine-formaldehyde) (PMF) microcapsule containing phase change material (microPCM) n-dodecanol was prepared by in situ polymerization. Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to study the chemical structure of graphene oxide (GO) and microPCMs, respectively. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to investigate the morphology of GO and microPCMs, respectively. The thermal properties of microPCMs were studied by differential scanning calorimetry (DSC), thermal constant analysis (TCA) and thermal cycling tests. The FTIR and XRD results indicate that the phase change material n-dodecanol is encapsulated in the GO/PMF composite shell, and there is no chemical reaction between them. The SEM results show that the prepared GO-modified PMF microPCMs are spherical particles with a smooth surface. The DSC results indicate that the phase change temperature and the latent heat of microPCMs with 1 wt% of GO are 26.40 °C and 125.2 J g−1, respectively. The thermal conductivity of GO/microPCMs with 4 wt% GO increases by 66.29%, compared with that of microPCMs without GO according to the TCA results. Moreover, the thermal cycling tests show that the prepared microPCMs possess a good thermal stability. The GO-modified PMF microPCMs are sure to have great potential applications in thermal energy storage.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Zhishuo Liu,Yifang Hua,Suqin Liu,Hongfei Li,Xiaoyu Gu,Jun Sun,Sheng Zhang
In this study, a novel approach was employed to enhance the flame retardant efficiency of an intumescent flame retardant (IFR) by growing a layered double hydroxides (LDHs) of Zn/Fe on the surface of melamine polyphosphate (MPP), denoted as Zn/Fe-LDH@MPP (LDHMPP). This modification was carried out via in-situ co-precipitation, and the resulting composite was subsequently applied to polypropylene (PP) in conjunction with piperazine pyrophosphate (PAPP). Under the same proportion and concentration, the PP/16 %LDHIFR formulation achieved a preferred V-0 rating in the UL-94 test. Furthermore, this formulation exhibited an enhanced ability to form a protective char layer, as evidenced by both cone calorimetry tests (CCT) and thermogravimetric analysis (TGA) tests. Additionally, the synergistic effect of Zn/Fe-LDH on flame retardancy was also studied.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhike Wang,Ting-Ting Li,Hao-Kai Peng,Hai-Tao Ren,Ching-Wen Lou,Jia-Horng Lin
Hydrogels have extensively studied as adsorbents, raw materials for the preparation of adsorbent hydrogels have low strength, while high strength hydrogels have weak adsorption capacity. In this study, PVA hydrogel was crosslinked via trihydroxy melamine and epichlorohydrin, and β-cyclodextrin with strong adsorption capacity was added to remove the heavy metal ions . Results showed that the addition of trihydroxy melamine with 8%, the compressive strength of the hydrogel was increased by approximately 20%. The Langmuir isotherm model showed that the adsorption capacity of the hydrogel for Pb(II) and Ni(II) reached 505.9 mg/g and 286.7 mg/g, respectively, and the efficiency of removing the low-concentration heavy metal ions in water more than 99%. The hydrogel is low cost, and maintained highly removal efficiency under low pH. The removal efficiency of the hydrogel remained above 90% after five repeated adsorption-desorption experiments. The hydrogels have a potential to be used in wastewater treatment as adsorbents.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FIRE SCIENCES
·
2023
·
IF 1.9
Chenran Fan,Lijuan Wei,Shicheng Zhao
To improve the flame retardant efficiency of intumescent flame retardants, some nano-scale additives as synergists were always added. In this work, nano silicon and piperazine pyrophosphate/melamine polyphosphate into polypropylene was investigated, which was obviously efficient to improve thermal stability and flame retardancy. The optimal synergistic ratio corresponded to 1 wt% SiO2, 10 wt% piperazine pyrophosphate, and 5 wt% melamine polyphosphate. The system passed the UL-94 V-1 classification and had a limiting oxygen index value of 34.5%. It exhibited a decrease on peak heat release rate and peak smoke production rate by 81% and 80%, respectively. Based on characterizations of scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the synergistic mechanism was investigated. A reactive cross-linking network between SiO2 and piperazine pyrophosphate/melamine polyphosphate during burning was formed to enhance the structure of carbon protective layer. Nano silicon acted as a foaming nucleating agent to promote the formation of porous dense carbon layer in intumescent flame retardants during burning. The synergistic strategy of SiO2 and piperazine pyrophosphate/melamine polyphosphate provided new compounded system for the design of polymeric materials with excellent flame retardancy, great thermal stability, and low release of heat and smoke.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 22
·10177-10188
·
IF 2.7
Hao Dang,Lu Wang,Yuanyou Peng,Lei Zhao,Yuan Li,Xiaoya Kang,Fen Ran
Vanadium nitride is a typical pseudocapacitive material that has attracted much attention among electrode materials as a result of its high theoretical capacity and wide voltage window. Nevertheless, its poor rate capability, cycling stability, and dissolution in alkaline electrolytes have restricted its practical applications. In this work, these problems are addressed by utilizing melamine-assisted pyrolysis and a dual-carbon composite strategy. A structurally controllable clustered shuttle vanadium-MOF is selected as the precursor. By subjecting it to high-temperature pyrolysis, melamine-derived carbon is coated on the surface of the vanadium-MOF, resulting in the formation of vanadium nitride-doped carbon electrode materials. Interestingly, they have a capacity of 407.5 F g−1 at a current density of 0.5 A g−1, with a capacity retention of 82.02% and a Coulombic efficiency of 80.59% after 10 000 cycles at a current density of 3 A g−1. When assembled into a device, the device shows a power density of 775 W kg−1 and an energy density of 39.29 W h kg−1. It is worth noting that the energy density reaches 15.82 W h kg−1 when the maximum power density of 3, 875 W kg−1 is attained. These anode materials have broad applications in energy storage systems, providing an innovative approach to developing new materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2021
·Vol. 11
·期 12
·
IF 1.548
Zhang Jie,Zhang Han,Wang Xuanyao,Zhang Min
The application of flame retardants in automobiles is extensive, and the existing flame retardants will cause some pollution to the environment. Therefore, environmentally friendly flame retardants need wide exploration. Natural fibers have been used in various fields for their environmentally friendly features. Thus, in this paper, hemp fiber (HF) was modified with phytic acid and then combined with melamine cyanurate to improve the fire safety of unsaturated polyester resins (UPRs). The fire behavior and thermal stability of UPR composites were evaluated using the limiting oxygen index (LOI), cone calorimeter test, and thermo-gravimetric analysis (TGA). With 3 wt. % modified HF (HF-P) incorporation, the LOI value of UPR/HF-P-3 composites increased from 18.9% of pure UPR to 22.1%, and the average heat release rate (AHRR) and total heat release were reduced to 401.9 kW/m 2 and 150.6 MJ/m 2 , respectively. TGA revealed that UPR/HF-P-3 composites led to the increased amount of residual char and better thermal stability compared to UPR/HF composites. In addition, HF-P endowed a better enhancement on the flexural strength of UPR composites.
研究领域:
材料科学
·
环境科学
✓ 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）