COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Shuang He,Cong Deng,Ze-Yong Zhao,Zi-Xun Chen,Yu-Zhong Wang
Currently, the promotion of flame retardancy is facing apparent decrease of mechanical properties for polyolefin , leading to an unresolved contradiction in this field. In this work, novel hyperbranched polyamide-amine based phosphorous-containing flame retardant PPAM-AT was designed to fabricate flame-retarded polypropylene (PP). Interestedly, when the flame retardancy of PP was greatly improved after incorporation of PPAM-AT, mechanical properties of flame-retarded PP were barely damaged compared with corresponding properties of neat PP. At 15% PPAM-AT, the limiting oxygen index (LOI) of PP/PPAM-AT 15 reached 30% and the highest V-0 grade was achieved in the burning test; the peak of heat release rate (PHRR) and fire growth rate of PP/PPAM-AT 15 were decreased by 83.8% and 60.7% in comparison with corresponding values of neat PP. Meanwhile, tensile strength and elongation at break for PP/PPAM-AT 15 maintained at 46.9 MPa and 551.3%, respectively, keeping at a comparative level with that of PP. Analysis on flame-retardant mechanism confirmed that typical intumescent flame retardation played a vital role for the excellent fire safety of PP/PPAM-AT. The reason for excellent mechanical properties of flame-retarded PP/PPAM-AT is ascribed to the multiple factors such as the change in the crystallization of PP, excellent energy-dissipating ability of PPAM-AT, and so on. This work demonstrated that hyperbranched polyamide-amine based phosphorous-containing flame retardant with unique chemical structure may achieve simultaneous flame retardancy and high performance of polypropylene, which opens a new pathway to solve the contradiction between flame retardancy and high performance of polyolefin.
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高影响因子
APPLIED CLAY SCIENCE
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2022
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IF 5.907
Yuanmeng Lou,Haiyun Ma,Yanyue Su,Yiheng Ma,Le Yang,Hong Zhang,Jianzhong Xu
Halloysite (Hal) nanotubes have become a good nano-carrier of flame retardant systems. In the present work, cavity expansion of Hal was achieved by etching with sulfuric acid to improve its loading capacity. Then, copper phytate was synthesized and encapsulated in the Hal to obtain Phyt-Cu@Hal. Finally, a sulfonyldiphenol-containing polyphosphazene derivative (PZS) was polymerized and wrapped on Phyt-Cu@Hal external surface to form a hierarchical nanohybrid structure (Phyt-Cu@Hal@PZS). Herein, Phyt-Cu encapsulated in Hal acts as catalyzing and char-forming agents while the wrapped PZS acts as an interfacial compatibilizer which can improve the dispersion and flame retardancy of Phyt-Cu@Hal@PZS in the EP matrix. The flame retardancy and smoke suppression of the corresponding EP nanocomposites were significantly enhanced due to the synergistic effect of Phyt-Cu@Hal@PZS. After adding 5 wt% Phyt-Cu@Hal@PZS, the peak heat release rate and smoke release rate were reduced maximally by 34.3% and 42.1%, respectively. Moreover, the char residue was also greatly enhanced which is 97.3 times higher than that of neat EP. The flame retardant mechanism of Phyt-Cu@Hal@PZS was assumed that the Phyt-Cu immobilized within the Hal could distinctly inhibit the flammable pyrolysis products; the external PZS layer promotes the char formation of EP matrix; the nanoscale combination of Phyt-Cu, Hal and PZS could further enhance the catalyzing carbonization to produce a physical barrier effect.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 42
·19756-19768
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IF 4.682
Yang Ruilu,Zhang Qi,Li Chunjian,Zhang Jian,Xin Yangyang,Ju Xiaoqian,Wang Dechao,Shi Jian,Zheng Yaping
The copper ion adsorption in wastewater treatment has gained increasing attention, which lies in the development of efficient adsorption materials. Herein, we demonstrated a novel class of macroscopic liquid-like three-dimensional (3D) graphene oxide (GO)-based derivatives for copper ion adsorption. To be specific, a supermolecular self-assembly process of GO in water induced by melamine and phytic acid, thus generating three-dimensional porous structural GO backbone. Then, the polyetheramine (M2070) and organosilane (KH560) were tethered via the covalent linkage, thus forming flexible oligomer species with silicon hydroxyl groups. Then, the oligomer species were attached to the surface of the GO backbone, yielding a novel class of black, homogenous GO-based derivatives. As expected, the liquid-like GO-based derivative presents the superior copper ion removal ability due to the synergistic effect of additions (melamine, phytic acid) and 3D porous structural backbone. More significantly, we presume that the rich libraries of organic oligomer species, together with other 2D nanosheets-based backbones (e.g., MXene, boron nitride, hydrotalcite, etc . ), undoubtedly provide more convenience for the further construction of liquid-like 3D derivatives, eventually open a new era of advancing the development of novel adsorbents for heavy ions remove.
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高影响因子
ACS Omega
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2022
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IF 4.132
Yinchun Fang,Jianguo Wu,Weihao Sun,Xinhua Liu
Xuan paper with outstanding cultural and artistic values is one of the most precious Chinese handmade papers and is widely used in traditional calligraphy and painting. However, the highly combustible cellulosic raw materials of Xuan paper present potential fire hazards. Ammonium phytate (AP) originating from biosourced phytic acid has been used for the flame-retardant treatment of Chinese Xuan paper by facile spray coating. The limiting oxygen index value of the treated Xuan paper increased to higher than 40%, demonstrating that the flammability of Xuan paper was greatly reduced by this treatment. The excellent flame retardancy afforded by this treatment was confirmed by cone calorimetry. TGA was used to demonstrate that the presence of AP changed the thermal decomposition process to promote char formation during the degradation of Xuan paper. The flame-retardant mode of action of phytate-coated Xuan paper was investigated using TG-FTIR, SEM, and XPS spectra. A P–N cooperative effect was proposed to account for both the condensed phase and gas-phase flame-retardant actions. The phosphorus component promotes char formation in the condensed phase, while the nitrogen component releases inert species to dilute the fuel load in the gas phase. The ink-wetting property of the coated Xuan paper was influenced negligibly by the coating process. The development of fire-resistant Xuan paper using ecofriendly flame retardants through simple and convenient spray coating has been demonstrated.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Zhisen Wang,Zhengxin Ma,Shuaibing Wang,Menghan Pi,Xiaoyu Wang,Min Li,Honglang Lu,Wei Cui,Rong Ran
Common hydrogels containing abundant water are insulating materials and lose stretchability easily below the freezing point of water, holding limited potential in emerging applications such as wearable soft devices. The introduction of compatible biomass-derived materials into hydrogel systems could be a potential solution that simultaneously enables anti-freezing ability, mechanical enhancement, and antibacterial properties . Based on such a hypothesis, here we report the facile development of biocompatible hydrogels that are capable of maintaining satisfying mechanical properties and electrical conductivity well below zero degrees centigrade. The strategy is to reinforce neat polyacrylamide (PAAm) hydrogels with biomass-derived cellulose nanocrystal (CNC) and phytic acid (PA), transforming the originally weak, insulating hydrogels into tough, highly conductive ones. Anti-freezing and antibacterial properties also emerge in the reinforced hydrogels, enabling them to work as efficient wearable sensors below zero degrees centigrade. Considering that numerous polymer hydrogel systems are compatible with CNC and PA, we believe that this simple biomass-based strategy can work universally to enhance and functionalize various weak and insulating hydrogels that are traditionally susceptible to frost and bacteria.
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PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Qiuru Bao,Ren He,Yuan Liu,Qi Wang
With the rapid improvement of microelectronics integration and assembly technology, the increasing heat flux density in electronic devices puts forward higher requirements for efficient heat dissipation and fire safety of thermal management materials (TMMS). In this work, we proposed a facile method to exfoliate and organically modify hexagonal boron nitride (h-BN) via phytic acid assisted-ball milling and self-assembly of zeolitic imidazolate frameworks (ZIF-8). And the obtained multifunctional additive (BAZF) successfully achieved the synergistic integration of highly thermal conductivity and superior fire safety in epoxy resin (EP). Besides, BAZF was also utilized as a curing agent to initiate the crosslinking reaction of EP, and the activation energy ( E α ) and kinetic parameters of curing process were obtained by the fitting of Kissinger and Crane equation. Compared to EP, the peak heat release rate (PHRR), smoke production rate (SPR) of EP composites containing 16 wt% BAZF significantly reduced by 58.2% and 47.7%, respectively, showing superior flame retardancy. Contributed by the good compatibility between fillers and matrix, BAZF significantly enhanced the thermal conductivity and mechanical properties of EP composites. As a result, this work provides a cost-effective route for the preparation of epoxy-based TMMS, which shows significant potential application in modern microelectronic industry.
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高影响因子
Journal of Natural Fibers
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2022
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IF 3.507
Yinchun Fang,Weihao Sun,Lin Li,Qian Wang
Cotton is one of the most common natural textile fiber, while the high flammability and easy to crease restrict its applications. Improving the flame retardancy and anti-crease property of cotton fabric is very important for its industrial applications. In this study, phytic acid and chitosan were used to construct bio-based IFR system which was used along with eco-friendly 1,2,3,4-butanetetracarboxylic acid (BTCA) to enhance the flame retardant and crease-resistant properties of cotton fabric simultaneously. The results of LOI and vertical burning indicated that the multifunctional modified cotton fabric would greatly improve the flame retardant properties. The modified cotton achieved the LOI values of over 31% indicating excellent flame retardancy. And the multifunctional modified cotton fabric obtained the CRA over 260° revealing excellent crease-resistant performance. This research provides basis for the development of multifunctional modification of natural cellulosic fibers to improve their flame retardant and crease-resistant properties using bio-based products and eco-friendly polycarboxylic acid.
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高影响因子
MOLECULES
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2022
·Vol. 27
·期 19
·6627
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IF 4.927
Hao Zhang,Lili Liang,Hailing Xi,Datong Liu,Zhanguo Li,Xiaoyan Lin
Compared with polymers and nanoparticles, fatty alcohols can not only increase the stability of foam, but also maintain better foamability at pH < 2, which is beneficial to reduce waste liquid and increase decontamination efficiency for radioactive surface pollution. However, different fatty alcohols have different hydrophobic chain lengths. The effects of fatty alcohols with different chain lengths on the performance of decontamination foam were studied at pH < 2, to assist in the selection of suitable fatty alcohols as foam stabilizers. Combined with betaine surfactant and phytic acid, biomass-based foams were synthesized using fatty alcohols with different chain lengths. When the hydrophobic tail groups of the fatty alcohol and the surfactant were the same, the foam showed the best performance, including the lowest surface tension, the highest liquid film strength, the greatest sag-resistance and the best stability. However, when the hydrophobic tail groups were different, the space between adjacent surface active molecules was increased by thermal motion of the excess terminal tail segments (a tail-wagging effect), and the adsorption density reduced on the gas-liquid interface, leading to increased surface tension and decreased liquid film strength, sag-resistance and stability. The use of decontamination foam stabilized by fatty alcohols with the same hydrophobic group as the surfactant was found to increase the decontamination rate of radioactive uranium pollution from 64 to over 90% on a vertical surface.Keywords:foam decontamination;radioactive pollution;low pH;chain-length matching;biomass-based
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
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IF 9.224
Wenke Liu,Qingwei Qin,Hailin Zhang,Xing Chen,Ling Luo,Guangqiang Li,Shili Zheng,Ping Li
The conventional neutralization method for removing impurities Fe(III) and Al(III) from spent Li-ion battery (LIB) leaching solutions has encountered problems of low impurity removal efficiency or high loss of valuable metals. In this study, highly selective and effective separation of Fe(III) and Al(III) from spent LIB leaching solutions was achieved by the precipitation–complexation technology. It was found that almost all Fe(III) together with most of the Al(III) could be removed by preferential precipitation using NaHCO3 neutralization under an equilibrium pH of 3.3 at 95 °C. Phytic acid, as a selectively complexing agent, was then introduced to completely remove the residual Al(III) from Fe-removed solutions with an Al/PA molar ratio of 3:1 at 60 °C. As a result, more than 99.5% Fe(III) and 97.08% Al(III) could be removed from the actual solutions, with a total loss of Ni, Co, Mn, and Li of only 1.1%. Furthermore, the obtained Al-phytates could be decomposed to form Al(PO3)3 products at 1000 °C. The whole process not only realized the efficient removal of Al(III) and Fe(III) at low pH with minimal loss of Ni, Co, Mn, and Li but also reduced the emission of wastes and utilized the Al resources.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
Yichen Tian,Chuyi Wang,Yuanfang Ai,Longcheng Tang,Kun Cao
Phytic acid-based phosphate esters (PAPEGs) were prepared through the reaction between phytic acid (PA) and different proportions of polyethylene glycol 200 (PEG-200). Intumescent flame-retardant coating (IFRC) with PAPEG3, PAPEG6, PAPEG9 and PAPEG12 were obtained via thermal curing of PAPEGs and melamine formaldehyde resin (MFR), respectively. The backside temperature of steel with MFR/PAPEGs coating was much lower than that of MFR/PA coating. MFR/PAPEG6 coating showed the best flame retardancy, and the char thickness reached 48 mm from initial thickness of 0.4 mm, and the expansion ratio was 120 times. Cone calorimeter confirmed that the incorporation of PAPEG6 could minimize the heat release rates and total heat release of materials during combustion. Moreover, the MFR/PAPEGs coating possessed both excellent transparency and water resistance. The transmittance of MFR/PAPEG6 and MFR/PAPEG9 was above 87% at 600 nm, and transmittance of MFR/PAPEG12 even reached 90%. The proposed flame-retardant mechanism was that MFR/PAPEGs produced phosphorus-containing acids to dehydrate and carbonize PEG, leading to the formation of graphitized chars. Meanwhile, the nitrogen-containing intermediates simultaneously released noncombustible gases to expand the char and interrupt the combustion reaction.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Ruixia Kong,Jingli Ren,Min Mo,Lianbin Zhang,Jintao Zhu
In this study, a multifunctional coating with antifogging, self-cleaning, antibacterial, and self-healing capabilities is developed based on polyelectrolyte complexes of polyethylenimine (PEI), phytic acid (PA), and Cu 2+ (denoted as PEI-PA-Cu). The multifunctional PEI-PA-Cu coating with high transparency can be prepared by spraying, brushing, or other one-step deposition onto various substrates (e.g., polymeric substrates and glass slides). Such a coating shows an excellent antifogging effect in both high temperature (85 ℃) and cold environments (−20 ℃) and maintains stable antifogging performance after placing in ∼65 ℃ vapor for 9 h. In addition, the coating is superhydrophilic and allows for easy spreading of water to isolate the oily contaminants, realizing self-cleaning. Meanwhile, the coating possesses superior antibacterial capability against Escherichia coli and Staphylococcus aureus thanks to PEI with amino groups and Cu 2+ . Importantly, the PEI-PA-Cu coating can heal damages rapidly and repeatedly due to the presence of hydrogen bonds and electrostatic interactions, effectively prolonging the service life. This study provides a facile route to construct multifunctional superhydrophilic coatings with promising prospects in the field of personal protective, medical, and optical devices.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wei Wu,Wenjie Huang,Yizhang Tong,Jingshu Huang,Junchen Wu,Xianwu Cao,Qunchao Zhang,Bin Yu,Robert K.Y. Li
The addition of traditional flame retardant additives can usually significantly reduce the flammability of thermoplastic polyurethane (TPU) but has a limited contribution to suppressing smoke release during combustion. To overcome this obstacle, a double core-shell structured zeolite imidazole framework-8 (ZIF-8) in combination with negatively charged phytic acid and positively charged hyperbranched polysiloxane (NH 2 -HBPSi) was layer-by-layer self-assembled through the electrostatic method. The decorated NH 2 -HBPSi layer effectively improved the interfacial compatibility between the fillers and the TPU matrix. The peak heat release rate (PHRR), total heat release (THR), total smoke production (TSP), and total CO production (TCOP) of the TPU composite containing 2.0 wt% ZIF-8@PA@NH 2 -HBPSi were reduced by 35.2%, 25.2%, 65.5%, and 52.8%, respectively, as compared to those of pure TPU. The distinguished fire resistance and smoke suppression were ascribed to the flame retardant effects of Zn, N, P, and Si elements in the ZIF-8@PA@NH 2 -HBPSi hybrid. In addition, the TPU/ZIF-8@PA@NH 2 -HBPSi composite maintained a high elongation at break of 2178.2% and tensile strength of 46.87 MPa due to the steric effect of NH 2 -HBPSi. This work presents a feasible strategy for the design and development of flame retardant fillers to improve fire resistance and inhibit smoke emission while maintaining the high ductility of TPU.
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高影响因子
危险品化学品经营许可证（带存储）