APPLIED CLAY SCIENCE
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2025
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IF 5.8
Weihua Meng,Da Yang,Shengnan Wang,Chenyang Liu,Pengyang Zou,Yuan Li,Jixing Xie,Jianzhong Xu
Epoxy resin (EP) is a high-performance polymer whose broader application is restricted by inherent flammability. In this work, a novel core-shell ILA@ATMEL was synthesized by coating natural illite with melamine-based aminotrimethylene phosphonate (ATMEL). The resulting hybrid was incorporated into EP to simultaneously improve flame retardancy and mechanical properties. With the addition of 9 phr ILA@ATMEL, the limiting oxygen index of EP composite reached 28.8 %, and the char residue at 800 °C increased from 17.82 % to 29.57 %. Cone calorimetry tests revealed notable reductions in peak heat release rate (33.57 %), total heat release (20.89 %), peak smoke production rate (29.37 %), and total smoke production (14.17 %) compared to those of pore EP. These improvements are attributed to synergistic flame-retardant mechanisms both in the condensed phase and the gas phase with Si, Al, P, and N elements. Moreover, ILA@ATMEL acts as a reinforcing filler at low loadings. The composite with 3 phr additive exhibited increases in elongation at break and tensile strength by 10.57 % and 18.86 %, respectively. This study demonstrates a feasible strategy for designing eco-friendly, high-performance EP composites with enhanced fire safety and mechanical durability via mineral-based core-shell flame retardants.
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POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Yansong Liu,Dingding Zhang,Yiting Tong,Zenan Chi,Xi Yu,Wei Tan,Zengge Guo,Yuanlin Ren
Improving the flame retardancy of Lyocell fibers without compromising their mechanical properties is the key to expanding their high-end applications. To achieve this goal, an innovative phosphorus-free flame-retardant modification strategy of "crosslinking protection first and then directional oxidation" was proposed. Melamine-crosslinked Lyocell fibers (MC@Lyocell) were constructed through the treatment of hydroxymethylated melamine, which were then directionally oxidized by a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) mediated NaClO oxidation system to in-situ generate sodium carboxylate (-COO - Na⁺) groups of cellulose fibers to obtain high flame-retardant oxidized MC@Lyocell fibers (OMC@Lyocell). The modified fibers exhibited significantly enhanced flame retardancy: Limiting oxygen index (LOI) increased from 17.0% to 30.5%, the peak heat release rate (PHRR) and total heat release (THR) decreased by 79.6% and 50%, respectively. Meanwhile, the structural integrity and mechanical properties were well maintained. Compared with the original fibers, the crystallinity only slightly decreased by 8%∼15%, with slower mass loss and a decline of polymerization degree. The melamine crosslinked network confines oxidation to cellulose crystal surfaces and amorphous regions, resolving the contradiction between carboxyl generation and mechanical property decrease. This environmentally friendly and efficient phosphorus-free strategy provides a new direction for preparing high-performance, structurally stable flame-retardant cellulose fibers.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·755-765
·
IF 11.806
Cheng Haoran,Xing Linlong,Zuo Yang,Pan Yamin,Huang Mina,Alhadhrami A.,Ibrahim Mohamed M.,El-Bahy Zeinhom M.,Liu Chuntai,Shen Changyu,Liu Xianhu
Phase change materials (PCMs) are ideal for thermal management in miniaturized and integrated electronic devices. However, developing PCMs with efficient thermal management and electromagnetic interference (EMI) shielding has remained a challenge to keep up with the rapid evolution of precision electronics. Herein, melamine foam (MF) was used as a template to build a continuous thermal/conductive network by dip-coating magnetized nickel (Ni)/MXene (NiM), and then, polyethylene glycol (PEG) was encapsulated into porous NiM/MF hybrid sponge via vacuum impregnation method. With the synergistic effect of magnetic Ni chain and highly conductive MXene, the obtained NiM/PCM achieve suitable thermal conductivity (0.39 W/mk), high electrical conductivity (76.3 S/m), and excellent EMI shielding effectiveness (34.6 dB). In addition, the NiM/PCM endows outstanding thermal stability, durability, and high latent heat storage capabilities. This work provides new ideas and insights for the EMI shielding and temperature protection of future microelectronic devices. Graphical abstract
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Carbon Energy
·
2022
·Vol. 4
·期 6
·1214-1227
·
IF 21.556
Zhicong Hu,Yongjin Zou,Cuili Xiang,Lixian Sun,Fen Xu,Menghe Jiang,Sensen Yu
The leakage of organic phase change materials (OPCMs) at temperatures above their melting point severely limits their large-scale application. The introduction of porous supports has been identified as an efficient leakage-proofing method. In this study, a novel carbonized Cu-coated melamine foam (MF)/reduced graphene oxide (rGO) framework (MF/rGO/Cu-C) is constructed as a support for fabricating stabilized multifunctional OPCMs. MF serves as the supporting material, while rGO and Cu act as functional reinforcements. As a thermal energy storage material, polyethylene glycol (PEG) is encapsulated into MF/rGO/Cu-C through a vacuum-assisted impregnation method to obtain PEG@MF/rGO/Cu-C composite with excellent comprehensive performance. PEG@MF/rGO/Cu-C exhibits high phase change enthalpies of 148.3 J g −1 (melting) and 143.9 J g −1 (crystallization), corresponding to a high energy storage capability of 92.7%. Simultaneously, MF/rGO/Cu-C endues the composite with an enhanced thermal conductivity of 0.4621 W m −1 K −1 , which increases by 463% compared to that of PEG@MF. Furthermore, PEG@MF/rGO/Cu-C displays great light-to-thermal and electric-to-thermal conversion capabilities, thermal cycle stability, light-to-thermal cycle stability, and shape stability, showing promising application prospects in different aspects.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 12
·6710
·
IF 6.208
Binghui Duan,Xianming Lu,Hongchang Mo,Bojun Tan,Bozhou Wang,Ning Liu
Safety concerns remain a bottleneck for the application of 2,4,6,8,10,12-hexanitro- 2,4,6,8,10,12-hexaazaisowurtzitane (CL-20)/1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane (HMX) cocrystal. Melamine–formaldehyde (MF) resin was chosen to fabricate CL-20/HMX cocrystal-based core–shell composites (CH@MF composites) via a facile in situ polymerization method. The resulted CH@MF composites were comprehensively characterized, and a compact core–shell structure was confirmed. The effects of the shell content on the properties of the composites were explored as well. As a result, we found that, except for CH@MF–2 with a 1% shell content, the increase in shell content led to a rougher surface morphology and more close-packed structure. The thermal decomposition peak temperature improved by 5.3 °C for the cocrystal enabled in 1.0 wt% MF resin. Regarding the sensitivity, the CH@MF composites exhibited a significantly reduced impact and friction sensitivity with negligible energy loss compared with the raw cocrystal and physical mixtures due to the cushioning and insulation effects of the MF coating. The formation mechanism of the core–shell micro-composites was further clarified. Overall, this work provides a green, facile and industrially potential strategy for the desensitization of energetic cocrystals. The CH@MF composites with high thermal stability and low sensitivity are promising to be applied in propellants and polymer-bonded explosive (PBX) formulations.Keywords:CL-20/HMX cocrystal;in situ polymerization;core–shell structure;desensitization;thermal stability
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PubMed
高影响因子
IONICS
·
2021
·Vol. 27
·期 12
·5287-5295
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IF 2.817
Cong Yuanyuan,Xie Guihui,Meng Xiangzhi,Wang Haibin,Meng Fanchao,Li Chunlei,Zhao Qiuping
Fabrication of an advanced electrocatalyst for oxygen reduction reaction (ORR) is important for the commercialization of fuel cells. Herein, we report an ORR electrocatalyst with Fe atoms evenly distributed on crumple-rich nitrogen-doped carbon (N–C) nanospheres via a simple melamine-assisted pyrolysis strategy, where crumple-rich N–C nanospheres are prepared by a dual soft template approach. The as-obtained Fe–N-C-M electrocatalyst shows a better onset potential (1.02 V vs. RHE) and half-wave potential (0.883 V vs. RHE) in alkaline solution, superior to the commercial Pt/C (0.97 and 0.860 V vs. RHE, respectively). Moreover, the Fe–N-C-M also displays outstanding stability with 80.4% of relative current remained after a 10-h stability test at 0.8 V vs. RHE and remarkable methanol tolerance with 79.2% of relative current sustained after adding 3 M methanol, outperforming the commercial Pt/C (49.4% and 48.5%, respectively). All of these excellent properties are contributed to the unique crumple-rich structure, large specific surface area, and high content of Fe-N x and pyridinic-N active centers.
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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.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Mengyuan Yin,Yuqi Wan,Shuai Li,Xiaoting Zhao,Wenwen Zhang,Yun Zhang,Hua Wang
Mesoporous melamine-silver (MA-Ag) nanocomposites doped with carbon nitride quantum dots (CN QDs ) were fabricated simply by the controlled supramolecular self-assembly. It was discovered that the resulting nanoflower-like CN QDs @MA-Ag nanocomposites could exhibit the peroxidase-like catalysis, which could be specifically enhanced by Hg 2+ by forming [email protected] alloys. A double catalysis-based colorimetric method was thereby developed for the fast detecting of Hg 2+ and Hg 0 in wastewater samples, with the levels down to 0.050 nM and 18.3 nM, respectively. Moreover, strong visible-light-driven photocatalysis of the nanocomposites was demonstrated for oxidizing Hg 0 into Hg 2+ through photocatalytic H 2 O 2 production so as to realize the detoxification of Hg 0 in the environmental wastewater. Besides, the fabricated mesoporous CN QDs @MA-Ag nanocomposites with large specific surface areas might facilitate the high Hg adsorption through the powerful MA-Hg chelate interaction, showing the efficient adsorption and/or removal of total Hg. The catalysis-selective colorimetric analysis and photocatalysis-based detoxification removal of total mercury may promise for wide applications in the environmental monitoring and wastewater treatment of toxic heavy metals of mercury.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Mingbo Shi,Daiwu Lin,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
The treatment of multicontaminant wastewater has attracted extensive attention in recent years. Herein, we synthesized a porous and hydrophobic composite (Zr-MOF-SH/MF) via the in situ growth of mercapto-functionalized Zr-metal–organic frameworks (MOFs) (Zr-MOF-SH) on the surface of a melamine formaldehyde (MF) sponge. The successful growth of hydrophobic Zr-MOF-SH, as confirmed by SEM, XRD, and XPS analysis, made the MF sponge become hydrophobic with a water contact angle of 125°. The adsorption capacity of the Zr-MOF-SH/MF composite for dichloromethane can reach up to 113 g/g. Moreover, the composite can efficiently and selectively remove Hg2+ ions from water. Especially, PCN-224-MAA/MF had an adsorption capacity of 412.5 mg/g for Hg2+ ions. The removal efficiency of Hg2+ ions increased as the oil content in the oil–water mixture increased. In addition, PCN-224-MAA/MF can be recovered and reused five times with only a slight decrease in adsorption capacity. This study provides a promising strategy for the synthesis of a dual-functional composite that exhibits excellent performance in removing oil and heavy metal ions simultaneously from water.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Hongfei Wang,Qiaobo Liao,Kai Xi
Melamine-based covalent organic frameworks are of great concern due to the low cost of melamine but difficult to synthesize in traditional solvothermal methods without the help of structural isomerization , meanwhile having limited application domains because of strong hydrophobicity . Herein, we present a robust synthesis of melamine-based crystalline porous polymer MBCPP and its nano silver-doped composites with one-pot strategy for catalytic reduction of 4-nitrophenol. With silver nanoparticles doping, the porous structure of organic frameworks becomes more regular, and the catalysts present different phase separation and specific catalytic characteristics for equivalent reduction of 4-nitrophenol, revealing the catalytic mechanism of electron transfer explained by slow diffusion inside the catalysts. Moreover, this work displays a creative metal doping strategy for the combination of metal and COFs.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 4
·1-11
·
IF 20.1
An Dong,Chen Yucheng,He Rizheng,Yu Huitao,Sun Zhijian,Liu Yifan,Liu Yaqing,Lian Qingsong,Feng Wei,Wong Chingping
Polymer-based thermal interface materials (TIMs) have been widely used in electronics to enhance heat transfer through the chip to heat sink. However, it remains a severe challenge to build the efficient phonon transfer pathways for improving the thermal conductivity and heat dissipation ability to cope with the increasing power density. Nowadays, TIMs with introduced template have attracted a great deal of attention because of the continuously three-dimensional (3D) structures. Herein, the reduced graphene oxide (rGO) with 3D networks was fabricated through the self-sacrificing template of melamine foam. Meanwhile, the reduced graphene oxide/natural rubber (rGO/NR) TIMs were prepared by the vacuum-assisted infiltration approach. As a result, the obtained TIMs exhibited the improved thermal conductivity (1.53 W m −1 K −1 ) and the good electromagnetic interference (EMI) shielding performance (26 dB) in X band at the filler content of 1.15 vol%. The results proved that rGO/NR TIMs successfully achieved the balance performance between the thermal conductivity and EMI shielding performance, indicating a bright prospect in the application of next-generation electronics. More importantly, this strategy can provide valuable guideline for designing TIMs with the excellent comprehensive performance for the thermal management. Graphical abstract
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Journal of Energy Storage
·
2023
·
IF 9.4
Sijia Hao,Yongjin Zou,Cuili Xiang,Lixian Sun,Fen Xu,Zhicong Hu
The single function and leakage of organic phase change materials (OPCMs) used alone considerably limit the scope of their large-scale applications. An efficient method of addressing this issue is by adding functional fillers and porous scaffolds to OPCMs. In this study, a novel CuS-coated carbonized melamine foam (CMF)/reduced graphene oxide (rGO) framework (CMF/rGO/CuS) was developed for the preparation of stable multifunctional OPCMs. The functional materials rGO and CuS were used as reinforcing materials, and CMF was used as a supporting material. Paraffin wax (PW), a thermal storage substance, was encapsulated in the CMF/rGO/CuS framework by vacuum-assisted impregnation to obtain a PW@CMF/rGO/CuS composite with excellent comprehensive properties. When the concentration of the conductive filler CuS was 2.0 wt%, the conductivity of the PW@CMF/rGO/CuS 2.0was 73.7 % more than that of pure PW, and its photothermal conversion efficiency exceeded 90 %. Meanwhile, CMF/rGO/CuS endowed the composite with a thermal conductivity of 0.2525 W m −1 K −1 , which was 33.6 % higher than that of pure PW. Finally, PW@CMF/rGO/CuS demonstrated high thermal cycling and thermal cycling stability with good application prospects in various fields.
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