POLYMER
·
2018
·
IF 3.483
Shui-Xiu Wang,Hai-Bo Zhao,Wen-Hui Rao,Sheng-Chao Huang,Ting Wang,Wang Liao,Yu-Zhong Wang
In an effort to overcome issues encountered in additive flame retardants for rigid polyurethane foams (RPUFs), a novel reactive flame-retardant triol (TDHTPP) based on a triazine and phosphate structure was designed and synthesized. This triol was chemically incorporated in the main chains of RPUFs as a chain-extender to prepare inherently flame-retardant RPUFs. TDHTPP showed good solubility in the polyols (polyol 4110 and PEG 400) of RPUF, making it convenient for industrial fabrication, such as in spay foaming. Excellent compatibility of TDHTPP with the polymer matrix endowed flame-retardant RPUFs (FR-RPUFs) much higher compressive strength than that of the neat RPUF, and a low thermal conductivity of ∼0.03 W/(m·K). Notably, with only 5 wt% of TDHTPP incorporated, the resultant RPUF displayed a UL-94 V-0 rating and more importantly, exhibited a great persistent flame retardancy during thermal accelerated aging tests at 140 °C for 96 h. Further characterization revealed that TDHTPP possessed both vapor-phase and condensed-phase flame-retardant behaviors, in which, vapor-phase action was dominant. This work provides a facile route to synthesize RPUFs with persistent flame retardancy, excellent thermal insulation and mechanical properties .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51932
·
IF 3.125
Hao Liu,Dongcheng Sun
A supramolecular waterborne polyurethane (SWPU) with excellent mechanical and self-healing properties simultaneously is reported in this work. Herein, the SWPU were synthesized by using 2,4-diamino-6-undecyl-1,3,5-triazine react with isophorone diisocyanate to introduce ureidotriazine (UTr) structures into the main chain of polyurethane that can self-assemble to form quadruple hydrogen bonds systems. A higher dimerization constant obtained through introducing two intramolecular hexatomic ring hydrogen bonds into the UTr structure, and the hydrophobicity, plasticity brought by the undecyl group on the triazine ring are beneficial to make a great balance between the binding strength for mechanical performance and the chain reversibility, mobility for self-healing. Owing to the accuracy design, the SWPU exhibits high tensile stress (33.85 MPa) and excellent self-healing ability (90.52%), which shows an enormous application potential in the field of functional coatings and adhesives.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jiaqi Ji,Tianqi Yang,Weiyu Zhang,Jie Li,Hong Li,Yi Tang,Weiyi Jin,Yiming Sun,Keda Li,Wei Li,Xiaoquan Ding,Chenliang Gong
The high temperature proton exchange membranes (HT-PEMs) possessing both high dimensional stability and excellent proton conductivity is currently a challenge for the development of high temperature proton exchange membrane fuel cells (HT-PEMFCs). The covalent organic frameworks (COFs) are competitive fillers to avoid the above trade-off due to their porous backbone and high specific surface area. In this work, a triazine-rich COF named EB-COF-1 is facilely synthesized at room temperature. Subsequently, a series of COF-doped HT-PEMs are prepared by incorporating varying contents of EB-COF-1 into poly [2,2’-(p-oxydiph-enylene)-5,5′-benzimidazole (OPBI) matrix. The incorporating of EB-COF-1 containing abundant triazine structure can significantly enhance both dimensional and mechanical stability of the hybrid membrane while maintaining its phosphoric acid uptake. Moreover, the EB-COF-1 can promote the establishment of dense hydrogen bonds network within membrane and improve its proton conductivity. Among them, the membrane containing 7 wt% EB-COF-1 exhibits highest peak power density (236.45 mW cm −2 at 80 °C and 768.41 mW cm −2 at 180 °C, under anhydrous conditions) over a flexible operating temperature range as well as an excellent proton conductivity of 0.1799 S cm −1 at 180 °C. Moreover, its voltage decay rate (0.069 mV h −1 ) is only 14.22 % of OPBI after 150 h long-term stability test.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Weiqi Xie,Shiwen Huang,Shumei Liu,Jianqing Zhao
Searching highly-efficient flame retardants for flame-resistance and smoke-suppressed epoxy thermosets with enhanced mechanical performance has aroused considerable interest in the field of flame-retardant materials. Herein, a phosphorus-based flame retardant, 6,6′,6''-(1,3,5-triazine-2,4,6-triyl)tris(oxy))tris(3-methoxybenzene-4,1-diyl))tris(hydroxymethylene))tris(dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (Trif-D), was synthesized using a two-step method and served as the flame-retardant additive for commercial epoxy thermoset. The epoxy thermoset with the low loading of 5.0 wt% Trif-D (Trif-D-5, phosphorus content = 0.39 wt %) possessed a UL-94 V-0 rating (with a limiting oxygen index of 33.1%). According to the cone calorimeter test, compared with epoxy thermoset without Trif-D addition (Trif-D-0), the reductions of peak heat release rate and total smoke production in Trif-D-5 were 66.3% and 51.3%, respectively. The mechanism analysis confirmed that the phosphorus-based structure from Trif-D contributed both the gaseous-phase and condensed-phase flame retardance of epoxy network. Moreover, Trif-D-5 possessed the high mechanical stiffness due to the introduction of rigid structures (phosphaphenanthrene, triazine and benzene) from Trif-D, showing 5.2%, 3.6% and 5.9% increase in storage modulus (at 30 °C) (3.03 GPa vs. 2.88 GPa), tensile modulus (3.47 GPa vs. 3.35 GPa) and flexural modulus (2.89 GPa vs. 2.73 GPa) as compared to Trif-D-0, respectively. The present paper investigates a facile method for the fabrication of high-performance epoxy thermosets with excellent flame retardance and enhanced mechanical stiffness.
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
POLYMER DEGRADATION AND STABILITY
·
2017
·
IF 3.386
Wei Wang,Panyue Wen,Jing Zhan,Ningning Hong,Wei Cai,Zhou Gui,Yuan Hu
A novel charring agent (PEPAPC) containing pentaerythritol and triazine structure, was successfully prepared via the nucleophilic substitution reaction of cyanuric chloride , 2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane-4-methanol (PEPA), and piperazine . Then, different proportions of PEPAPC and ammonium polyphosphate (APP) were added into polypropylene (PP) at a 20% total loading via melt blending. The results of limiting oxygen index (LOI), vertical burning test (UL-94), thermogravimetric analysis (TGA) and cone calorimeter test revealed that PEPAPC/APP system could effectively enhance the thermal stability and flame retardance of PP. When the weight ratio of APP to PEPAPC was 3:1 with a 20% loading (PP6), the PP composite achieved the highest LOI value of 28% and passed the vertical burning test (UL-94) V-0 rating. Meanwhile, PP6 showed the highest amount of char residues via TGA test and the lowest PHRR (253 kW/m 2 ) via cone calorimeter test. Moreover, Scanning electron microscopy (SEM) also indicated that PEPAPC/APP system benefited to the formation of more compact char layer which hindered the transfer of volatiles and heat during burning. The investigation of their water resistance demonstrated that the PP6 still obtained a UL-94 V-0 rating after 72 h dipping in hot water.
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
HIGH PERFORMANCE POLYMERS
·
2015
·
IF 1.286
Haitong Sheng,Fenghua Zhao,Xiaoyan Yu,Kimiyoshi Naito,Xiongwei Qu,Qingxin Zhang
Two kinds of phthalonitrile monomers based on 1,3,5-triazine structure have been synthesized. The chemical structures of the phthalonitrile monomers were characterized by Fourier transform infrared and nuclear magnetic resonance spectroscopies. Differential scanning calorimetric analysis revealed the curing behavior of the monomers. Thermogravimetric analysis suggested outstanding thermal stabilities of the triazine-structured phthalonitrile polymers. Thermal decomposition kinetic analysis indicated that the activation energy of the two phthalonitrile polymers is 205.6 and 152.3 kJ mol−1, respectively. Dynamic mechanical analysis showed that the storage moduli (E′) are 3.62 GPa and 3.66 GPa, respectively, and glass transition temperatures of both the monomers are higher than 350°C. Postcuring effects were investigated, which showed that more excellent thermal and mechanical properties were achieved with postcuring.
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
MATERIALS RESEARCH INNOVATIONS
·
2023
·
IF 0
Qiong Yao,Shouwu Yu
A triazine long chain charring agent (TCA) was synthesised using cyanuric chloride, morpholine and anhydrous piperazine. The synthesised TCA was compounded with ammonium polyphosphate (APP) to obtain an intumescent flame retardant (IFR). When the TCA content in the IFR was 35 wt% to 45 wt%, the IFR had good expansion properties. Then, different proportions of IFR were incorporated into polypropylene (PP) to prepare flame retardant PP composites, and the flame retardancy, thermal degradation behaviour and flammability behaviour for PP composites were investigated by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. When 20 wt% of IFR (With TCA 35 wt%) were added into the PP matrix, the composite achieved a V-0 rating for the UL-94 test and its LOI value was increased to 28.8%. Compared with neat PP, peak heat release rate (PHRR) and total heat release (THR) decreased from 827.30(KW·m−2) and 120.48(MJ·m−2) to 210.50(KW·m−2) and 75.08(MJ·m−2).
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
LANGMUIR
·
2023
·
IF 3.9
Yanbiao Ren,Dandan Zhu,Tiesheng Shi,Bo Song,Jingbo Qi,Lincai Zhang,Yanxin Yu
Herein, we demonstrated the preparation of novel three-dimensional (3D) superamphiphilic g-C3N4@carbon nanofibers foam (g-C3N4@CNFs) via a two-step approach: liquid nitrogen treatment-freeze-drying; the foams possessed good thermal stability. In this approach, melamine acted as a nitrogen source, and nanofibrillated cellulose (NFCs) functioned as a 3D skeleton. The thermal stability of the as-prepared g-C3N4@CNFs-3 foam was much higher than that of g-C3N4@CNFs-1, as indicated by thermogravimetric data, including an increase of the onset weight loss point (Tonset) by 238.6 °C and an improvement of the maximal weight loss rate (Tmax) by 258.8 °C. The combination of g-C3N4 with CNFs conferred a reduction in the heat release rate (ca. −86%) and the total heat release (ca. −75%). Furthermore, the composition of the hydrophilically oxygenated functional groups and hydrophobic triazine domains in g-C3N4@CNFs rendered it a unique amphiphilic property (contact angle close to 0° within 1.0 s for water and 0° within 12 ms for hexane). A high storage capacity for water and various organic solvents of the superamphiphilic g-C3N4@CNFs foam was found, up to 40–50 times its original weight. The discovery of these superamphiphilic foams is of great significance for the development of superwetting materials and may find their applications in oil emulsion purification and catalyst support fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYOGENICS
·
2024
·
IF 1.8
Tian Zhao,Yalin Zhao,Zhicong Miao,Tao Wang,Rongjin Huang,Laifeng Li
Epoxy resins are widely used in cryogenic applications due to their distinguished mechanical and electrical insulation properties. To avoid generating enormous amounts of waste that affect the environment and cause economic losses, covalent adaptable networks can be introduced into the epoxy structure to make the thermosetting network reversible. In this study, ester bond and hexahydro-s-triazine structure were adopted in epoxy structures. Two new degradable epoxy resins (HPBE and HPHE) with variances in the content of benzene rings were synthesized which were confirmed by FTIR and NMR. After curing, the thermal, mechanical, thermal conducting properties of the resulting materials were examined. The products exhibited tensile strength and flexural strength all above 120 MPa at 77 K, with glass transition temperature of 89.1 °C and 86.9 °C, respectively. Meanwhile, HPBE and HPHE demonstrated favorable thermal stability, with thermal conductivity comparable to that of the commonly used epoxy resin DGEBA. These resins could be degraded under mild conditions and demonstrated high hydrolysis efficiency (approximately 90 %). This investigation presented a viable method for the application of degradable thermosetting materials in cryogenic environments and the possibility for repairing of high-value equipment. 1
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
ACS Applied Nano Materials
·
2020
·
IF 0
Heyun Wang,Hao Wang,Haoji Jiang,Ao Sheng,Zhong Wei,Yingchun Li,Chunlin Wu,Hao Li
Although covalent organic frameworks (COFs) have attracted extensive attention in recent years due to their unique advantages, the use of triazine-structured COFs in the nanofiltration (NF) membrane separation processes for acid wastewater containing heavy metal ions has not been explored. We selected hydrophilic triazine-structured COF nanosheets (NENP-1) that were added to a polysulfonamide (PSA) layer via interfacial polymerization to fabricate nanocomposite membranes (NENP-1-PSA/PES). The NENP-1 brings about the synergy of improved hydrophilicity and positive charge ability with suitable pore sizes that facilitate high permeation for water molecules and high rejection for inorganic salts. Meanwhile, the NENP-1 was covalently linked to PSA matrix with better interface compatibility and membrane stability. The water flux and MgCl2 rejection of the membrane increased up to 15.1 L/m2·h·bar and 93.3%, respectively, after adding only 0.1 w/v% NENP-1, which corresponded to increases of 149.6% and 4.6% compared to the pristine PSA membrane. In addition, the membrane also exhibited good stability in acid condition. This study paves the way for the development of membrane materials with the excellent separation performances in desalination and acidic environments.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Cijian Zhang,Jing Zhao,Yi Zhao,Ce Song,Chengwen Gu,Yan Kou,Xigao Jian,Zhihuan Weng
High-temperature oxidation and salt spray corrosion synergistically degrade marine propulsion components, demanding protective coatings that integrate thermal stability, interfacial adhesion, and electrochemical barrier properties. To address this, novel series of poly(biphenyl ether triazine nitrile)s (PBTNs) were prepared by incorporating rigid phenyl- s -triazine moieties into polyarylether backbones. The materials exhibit exceptional thermal resilience with high decomposition thresholds exceeding 550 °C under nitrogen atmosphere and glass transition temperatures above 215 °C, coupled with intrinsic self-extinguishing behavior validated by UL-94 V-0 certification. As coatings, PBTNs demonstrate comprehensive mechanical robustness including superior surface hardness, excellent impact resistance and strong substrate adhesion. Crucially, electrochemical verification confirms outstanding long-term corrosion protection in marine conditions, where the optimal sample maintains protective integrity through 1200 h of continuous salt spray testing without visible rust formation. Selected formulations further resist concentrated alkaline solutions (35 wt% NaOH) and acidic media (10 wt% H 3 PO 4 ) for extended 30 d exposures. This molecular design establishes a new paradigm for high-temperature protective coatings in marine engineering applications, significantly enhancing operational durability while reducing lifecycle maintenance burdens across maritime infrastructure systems.
研究领域:
材料科学
·
高分子化学
·
腐蚀工程
·
海洋工程
·
表面涂层
✓ 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）