JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Feifei Lu,Aiqin Dong,Guanjun Ding,Ke Xu,Jumei Li,Lijun You
Magnetic porous Fe 3 O 4 /MRCS polymer composite was prepared by reacting melamine-formaldehyde resin with chitosan in the present of amino modified Fe 3 O 4 nanoparticles and used as adsorbent for acid red 18 azo dye removal. The Fe 3 O 4 /MRCS was characterized by TEM , SEM, XRD, TGA and BET analysis. The Fe 3 O 4 /MRCS possessed high BET surface area (226.6 m 2 /g), characteristic pore properties and facile magnetic separation function. The average pore width is 6.5 nm and the pore volume was 0.68 cm 3 /g. The Fe 3 O 4 /MRCS presented enhanced high adsorption performance toward acid red 18. It removed 99. 65% of acid red 18 (100 mg/L) when the adsorbent amount was over 0.8 g/L. It was found the absorption was depended on pH and the removal efficiency decreased with pH increased. The maximum adsorption capacity of acid red 18 reached as high as 301.0 mg/g. The adsorption kinetic followed the pseudo-second-order kinetics model and the activation energy of the adsorption process was 38.40 kJ/mol. The adsorption isotherms were best fitted to the Redlich–Peterson isotherm equation. Thermodynamic studies indicated the adsorption process was spontaneous and endothermic in nature. The adsorption mechanism study showed the adsorption was a heterogeneous chemisorption process with multiple interactions, involving pore filling, electrostatic attraction, affinity interaction, intra-particle diffusion, π-π interaction and polymer chain inclusion and polymer net trapping. In comparison with other reported adsorbents, the magnetic porous Fe 3 O 4 /MRCS showed superior adsorption performance for acid red 18 removal.
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Chao Zhang,Jiandong Liu,Xiayun Huang,Daoyong Chen,Shiai Xu
Graphene-like g-C3N4 nanosheets (NSs) have been successfully synthesized with a modified polymerization process of melamine by cocondensation with volatile salts. Volatile ammonium salts such as urea–NH4Cl/(NH4)2SO4/(NH4)3PO4 were added with melamine to modulate the thermodynamic process during polymerization and optimize the structure formation in situ. The surface area, surface structure, and surface charge state of the obtained g-C3N4 NSs could be controlled by simply adjusting the mass ratio of the melamine/volatile ammonium salt. As a consequence, the g-C3N4 NSs exhibited much higher activity than bulk g-C3N4 for the photocatalytic degradation of target pollutants (rhodamine B, methylene blue, and methyl orange), and it also exhibited greater hydrogen evolution under visible light irradiation with an optimal melamine/volatile ammonium salt ratio. The as-prepared g-C3N4 NSs with melamine–urea–NH4Cl showed the highest visible light photocatalytic H2 production activity of 1853.8 μmol·h–1·g–1, which is 9.4 times higher than that of bulk g-C3N4 from melamine. The present study reveals that the synergistic effect of the enhanced surface area, surface structure, and surface charge state is the key for the enhancement of photocatalytic degradation and hydrogen evolution, which could be controlled by the proposed strategy. The result is a good explanation for the hypothesis that adding properly selected monomers can truly regulate the polymerization process of melamine, which is beneficial for obtaining g-C3N4 NSs without molecular self-assembly. Considering the inexpensive feedstocks used, a simple synthetic controlling method provides an opportunity for the rational design and synthesis, making it decidedly appealing for large-scale production of highly photocatalytic, visible-sensitizable, metal-free g-C3N4 photocatalysts.
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Materials Research Express
·
2020
·Vol. 6
·期 12
·125376
·
IF 1.929
Sainan Wu,Pan Zhang,Zhilong Xu,Zhang Chen,Yanfeng Gao
A series of microencapsulated phase change materials (microPCMs) are synthesized by encapsulating 1-dodecanol into cellulose nanofibers (CNFs) modified melamine-formaldehyde (MF) resin through in situ polymerization. The chemical structure and crystallography of the microcapsules are characterized by Fourier-transform infrared spectroscopy (FT-IR) and x-ray diffraction (XRD). Scanning electronic microscopy (SEM) images show that the obtained microcapsules are regularly spherical with smooth surface and an average diameter about 1∼3 μm. The cracking ratio test indicates that the addition of CNFs largely enhances the mechanical strength of the microcapsules, and the CNFs/MF-microPCMs (with 3.4 wt% CNFs) have a phase change enthalpy of 100.4 J g−1. Furthermore, the simulation result demonstrates that the indoor temperature modulation ability of CNFs/MF-microPCMs model house is 4.2 °C, which is more than that of model house without microPCMs under room temperature. These results indicate that CNFs/MF-microPCMs are potential candidates for thermoregulating applications.
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高影响因子
CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Zhirong Xu,Pengyu Xing,Yong Pan,Yuling Xiao
Fire safety remains a critical global challenge, as conventional fire protective materials focus on passive insulation/flame retardancy but lack active early-warning for incipient fires. Chitosan (CS)-based foams are promising for fire protection but suffer from inherent flammability, limiting practical use. Herein, CS-based foams composited with hydroxyapatite nanowires (HAP NWs) and phytate-melamine (PA/MEL) were fabricated via freeze-drying, forming an “active warning-passive protection” system. Structural characterizations confirmed uniform dispersion of HAP NWs and PA/MEL in CS matrix via hydrogen/ionic bonding. Thermogravimetric analysis revealed CS-HAP-10PA/MEL had 61.6% char residue at 750 °C (N 2 ), a 105.3% increase vs. pure CS. CS-HAP-10PA/MEL exhibited a limiting oxygen index (LOI) of 45.0% and a 76.3% lower peak heat release rate (pHRR) than pure CS, manifesting excellent flame retardancy. Fire warning tests indicated that CS-HAP-5PA/MEL triggered an alarm within 4.2 s (signal stable >60 s) upon exposure to flame and exhibited sensitive responsiveness at 60–200 °C (0.8 s response at 120 °C). A 6 mm-thick CS-HAP-5PA/MEL (36.6 mW/ (m . K)) sample reached only 61 °C surface temperature after 5 min at 120 °C (14.2 °C lower than pure CS), demonstrating good thermal insulation. This foam integrates warning, flame retardancy, and insulation, offering a novel strategy for intelligent fire protective materials.
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MOLECULES
·
2026
·Vol. 31
·期 8
·1304
·
IF 5.1
Yiwei Yu,Yongshun Liang,Dan You,Wenhao Yang,Ziyi Zhu,Yingjie Zhang,Linqiang Duan,Xue Li,Yiyong Zhang
The poor thermal stability of commercial polyethylene (PE) separators hinders the further application of lithium-ion batteries (LIBs), yet previous modifications struggle to balance between safety and electrochemical performance. This study proposes an interface modification strategy by forming a poly(melamine terephthalamide) (PTM) coating on the PE separator surface, constructing a “thermal–mechanical–electrochemical synergistic barrier”. The PTMs@PE separator achieves synergistic improvements in thermal shutdown behavior, thermal stability, mechanical strength, and electrochemical compatibility by taking advantage of the temperature-sensitive response of the PE separator, the flame-retardants of the rigid conjugated skeleton with the high nitrogen of PTM, and the electrolyte-affinity of its functional groups. Importantly, the principles between the molecular structure of the PTM coating and the thermal behavior is verified. The results demonstrate that PTM participates in the decomposition process of the PE separator and slows down the degradation rate of the PE chain structure, thereby resulting in a wide-temperature-range thermal shutdown temperature. The PTMs@PE effectively reduces the risk of runaway. The PTMs@PE separator achieves outstanding electrochemical compatibility, achieving a capacity retention rate of 99.27% at 2 C for 500 cycles. Notably, the separator shows high potential for scalable fabrication. This work provides a novel material system and technical pathway for developing highly safe and high-performance LIB separators.
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PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Enyuan Hu,Yingwen Zhu,Lei Zhao,Xinmiao Wang,Jinhui Wu,Bo Cui,Cheng Deng,Mengfu Zhu
Aerogels that effectively absorb noise provide a highly promising way to improve human living environments. However, maintaining stable broadband sound absorption performance under humid conditions remains challenging. Moreover, demanding fabrication requirements, complicated surface modification procedures, and inherent fragility are urgent to be solved. Herein, we present a mild modification-free strategy for fabricating superhydrophobic melamine@polyurea (ME@PUA) aerogels with stable porous structures and extraordinary noise-reduction capability by combining a template-assisted method with crosslinking-induced phase separation. The template skeleton’s self-supporting function, coupled with hydrogen bonding interactions from ME and PUA, constructs a robust three-dimensional network structure, achieving ambient-temperature drying. Furthermore, superhydrophobicity and acoustic properties are simultaneously achieved during ambient-temperature gelation due to the synergistic interaction between the PUA's material properties and the skeletal microstructure. This approach eliminates the need for low-temperature refrigerants and specialized drying equipment, while not increasing preparation time. The as-obtained ME@PUA aerogels, characterized by a novel porous architecture integrating core-shell structures and coral-like structures, have ultralow density (25.55 mg cm −3 ), superhydrophobicity (water contact angle >150°), low thermal conductivity (35 mW m −1 K −1 ), excellent flexibility (99% elastic recovery after deformation), and broadband sound absorption (NRC up to 0.50). Notably, ME@PUA aerogels maintain stable NRC after exposure to an extremely humid environment (80% RH) for 168 h or after 80% strain compression. This readily achievable, scalable, and reproducible synthesis approach provides a promising pathway for advancing the development of organic aerogels designed for stable noise reduction in humid environments.
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高影响因子
ENERGY & FUELS
·
2026
·
IF 6
Chunhua Zhao,Jianghang Song,Jiefei Yang,Chongjun Zhao
The potential of melamine–formaldehyde resin-based materials as nitrogen-rich carbon precursors remains underutilized because of low carbon residue, suboptimal pore development, and significant nitrogen loss during thermal treatment. Herein, leveraging confined pyrolysis and carbon composite strategies with melamine molding compounds (MM) and poly(vinylidene fluoride) (PVDF) as carbon precursors, the obtained heteroatom-doped porous carbon composite owns a superior specific surface area of 3008 m2 g–1 and a heteroatom doping content of 13.58 atom %. The optimized activated carbon (F-AMC-700–4) exhibits a high specific capacitance of 443 F g–1 at the current density of 0.5 A g–1, with the retention up to 88% after 20,000 cycles. The symmetric supercapacitor of F-AMC-700–4 delivers an energy density of 43.04 Wh kg–1 at a high power density of 450 W kg–1 within the voltage window of 1.8 V. This work presents a practical methodology for transforming MM into a heteroatom-doped porous carbon composite, highlighting its significant potential for high-performance supercapacitor applications.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Kerui Jiang,Jiansheng Wan,Fei He,Qufu Wei,Yibing Cai
Phase change materials (PCMs) demonstrate significant advantages in thermal energy storage and management systems due to their high enthalpy and almost constant phase transition temperatures. However, challenges such as inherent low thermal conductivity, flammability and leakage have limited their broad application. To address these issues, a biomimetic structural phase change composite (PEG/MF/PR) inspired by tomato was developed. This composite employed a melamine foam (MF) skeleton impregnated with phenolic resin (PR) followed by curing, which vacuum-adsorbed polyethylene glycol (PEG). In this biomimetic design, the MF functioned as columellar and vascular bundles, providing skeletal support; and the cured PR corresponded to flesh, enhancing mechanical strength of skeletal scaffold while providing abundant binding sites, thereby enabling the efficient encapsulation of PEG analogous to gelatinous substance. The obtained skeletal scaffold demonstrated a high PEG adsorption rate consistently above 84.5 wt%, along with superior leakage-proof feature. The PEG/MF/PR achieved an exceptional heat enthalpy of 159.2 J/g with a relative enthalpy efficiency of 97.1%, and exhibited outstanding thermal storage stability after undergoing 100 heating-cooling cycles. Thermal conductivity of PEG/MF/PR was approximately 0.1789 W·m −1 ·K −1 , representing a 41.4% enhancement compared to that of PEG/MF. More importantly, photothermal conversion capability of PEG/MF/PR was significantly enhanced due to the conjugated structures formed during PR curing and color darkening. The inherent flammability and dripping tendency of PEG upon exposure to flame were successfully mitigated by flame-retardant skeletal scaffold. Thus, the developed phase change composite provides great potential in waste-heat recovery and thermal management.
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高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 4.7
Shuang Chen,Ang Gao,Ke Liu,Ru Xiao
To enhance the flame retardancy of polyamide 6 (PA 6) while retaining its processability and mechanical properties, we developed a synergistic strategy that combines reactive copolymerization with additive incorporation. A rationally designed, lactam-based phosphonamide comonomer (DCL) ensured compatibility and reactivity during the ring-opening polymerization of caprolactam and was copolymerized in the presence of melamine cyanurate (MCA). The resulting PA 6-DCL/MCA composites exhibited outstanding fire performance: PA 6 with 5 wt % DCL alone achieved an LOI of 29.5%, whereas the hybrid composite containing 3 wt % DCL and 2 wt % MCA reached a UL94 V-0 rating with nonflaming melt dripping. The flame-retardant mechanisms were systematically investigated using techniques including cone calorimetry, with a focus on the pyrolysis process and charring behavior. The flame suppression is attributed to a synergistic effect involving dominant gas-phase inhibition combined with condensed-phase action, the latter comprising heat dissipation through controlled melt flow and the formation of a slightly reinforced char barrier. This design provides a scalable, halogen-free route to high-performance PA 6, where the flame-retardant efficacy arises from the interplay of molecular structure and additive synergy.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 7.4
Xian-Wei Cheng,Jia-Yi Song,Zheng-Yi Wang,Ying-Jie He,Jun Wu,Jun-Hui Yang,Kang Tao,Jin-Ping Guan
The development of sustainable, multifunctional polyester/spandex (T/S) protective fabrics is of increasing importance for advanced textile applications. In this study, a stable and multifunctional dispersion comprising melamine polyphosphate (MPP), aluminum diethylphosphinate (ADP), and carbon black (CB) was prepared via zirconia bead-assisted grinding and subsequently applied to T/S fabrics using a roll-bake coating process with the aid of polyacrylate adhesive. The coated T/S fabrics were systematically evaluated for color characteristics, antistatic performance, flame retardancy, combustion behavior, and underlying flame-retardant mechanisms. The results revealed that the coated T/S fabrics exhibited stable black coloration and excellent antistatic property, with minimal impact on tensile strength and air permeability. Furthermore, the coated T/S fabrics demonstrated self-extinguishing behavior, with a significantly reduced damaged length of about 7.1 cm and no molten dripping. The limiting oxygen index reached 27.5%, indicating enhanced flame resistance. They also displayed significantly suppressed heat release capacity. Mechanistically, MPP and ADP promoted the formation of a stable char layer through acid catalysis and carbonization, while releasing phosphorus-containing radicals and inert gases that disrupted flame-propagating reactions and reduced local oxygen concentration, effectively inhibiting combustion.
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高影响因子
Results in Engineering
·
2026
·
IF 7.9
Qian-Qian Chu,Jishuang Luan,Dehu Qv,Yangfan He,Peitao Fan,Xuanbo Wang,Bo Cheng,Li Feng,Baizeng Fang
Phase change materials (PCMs) absorb and release energy from the environment effectively during the phase change process, leading to their widespread use in the field of thermal energy storage. However, the development of PCMs has been limited by issues such as poor thermal conductivity and light absorption. We therefore designed a silver-plated melamine foam (MF) framework and synthesized a phenolamine aggregate coating on the MF through a redox reaction, enhancing the bonding with silver nanoparticles and resulting in fully silver-plated MF. Meanwhile, hydroxylated carbon nanotubes (HCNTs) were added to the framework as a filler. This modification improved the conductivity of the corresponding polyethylene glycol (PEG)-based composite PCMs from 0.33 (pure PEG) to 0.82 W m⁻¹ K⁻¹ due to the construction of a multilevel thermal conduction channel. Additionally, a high photothermal conversion efficiency of 92.4 % was achieved through the combined effect of the local resonance absorption of the silver and the molecular thermal vibration of the HCNTs. These advances provide a new strategy for optimizing the performance of PCMs, with potential applications in energy storage and thermal management.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 10
·e70382
·
IF 3.4
Qitan Zheng,Zhongzheng Zhu,Junyi Yao,Qunfu Fan,Hezhou Liu,Qiuxia Dong,Hua Li
Integrated sound absorption and sound insulation materials (SAM-SIM) are widely used for noise control. While adhesive bonding is commonly employed to fabricate SAM-SIM composites, this approach carries inherent risks of interfacial failure. To enhance structural stability, a method combining vacuum impregnation and polymer curing at the bottom of porous sound-absorbing materials is proposed to obtain a double-layer SAM-SIM structure. In this study, graphene oxide (GO) modified melamine (MA) sponge synthesized by freeze drying served dual roles: as the SAM layer and as a component in the SIM layer. High-damping polyurethane (PU) was used as the polymer matrix in the SIM layer. GO content in the MA sponge and PU composites was modulated by adjusting the GO solution concentration. Sound absorption performance of GO/MA, as well as mechanical, damping and sound insulation performance of GO/MA/PU were studied systematically. Results indicate that GO improved the sound absorption performance of GO/MA and significantly improved the damping properties of GO/MA/PU composites. The double-layer structure with 12.5 mm thickness of SAM and 2.5 mm thickness of SIM derived from GO/MA composite sponge treated with 5 mg/mL GO solution possessed average sound absorption coefficient (SAC) of 0.547 and average transmission loss (TL) of 41.88 dB in the frequency range from 1000 to 6300 Hz. These values align closely with adhesive-bonded SAM-SIM with the same material system, demonstrating that vacuum impregnation of elastomers in porous SAM offers a viable alternative for developing stable SAM-SIM composites.
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高影响因子
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