APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Yuanya Zhang,Yu He,Yongjun Zhou,Wen Ma,Junya Yuan,Xuehu Men
Epoxy resin (EP) is widely used in engineering moving components, but it remains a great challenge to address the high brittleness, low thermal properties and poor wear rate for real tribological application. We reported a robust ANFs/OMMT hybrid aerogel (AAM) with hierarchical framework through freeze-drying process. Thanks to the potent interfacial interaction between ANFs and OMMT , abundant rigid skeleton was constructed in the aerogel. Then the epoxy resin was introduced into ANFs/OMMT hybrid aerogel to establish a bicontinuous phase structure. As a result, ANFs/OMMT-EP materials with superior tribological properties were obtained with respect to pure EP. The outstanding friction performance was owing to the synergistic wear resistance mechanism of the ANFs and OMMT as well as the generation of high-quality transfer film during the sliding time. Meanwhile, the AAM hybrid aerogel constructed a 3D thermal conductive pathway inside the EP matrix to effectively inhibit the accumulation of frictional heat during the sliding process. This work could be significant for the expansion of aerogel in friction applications.
研究领域:
材料科学
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工程学
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产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 3
·420
·
IF 2.972
Qifeng Chen,Xinya Du,Guangxue Chen
In the present study, plant fiber foam materials have significant differences in density compared to conventional plastic foam materials. In view of the current problems of fiber foam materials, the montmorillonite (MMT) organically modified by octadecyl-dimethyl-benzyl-ammonium chloride (ODBA) was added to the preparation of composite foam materials by optimizing the existing formula. The properties of organic montmorillonite (OMMT) and the prepared composite foam materials were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), and a standing wave tube sound absorption tester. The results showed that the pore size inside the plant fiber foam materials with the addition of OMMT was more uniform and arranged more closely and orderly. In addition, when the OMMT was added to 0.1 g, the density of the prepared OMMT-bagasse composite foam materials reached its lowest point of 0.079 g/cm3, which was shared with high foam materials.Keywords:plant fiber composite foaming;ODBA;OMMT;sound absorption
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
E-POLYMERS
·
2020
·Vol. 20
·期 1
·303-316
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IF 1.675
Haihua Yu,Xiuhang Xu,Yunfei Xia,Mingzhen Pan,Nighat Zarshad,Bo Pang,Anis Ur Rahman,Min Wu,Henmei Ni
According to the concept of fire life cycle assessment (LCA), a new type of intumescent flame retardant was designed and synthesized by chemically bonding chitosan, phosphorus pentoxide and melamine. The resultant compound, chitosan ethoxyl melamine phosphate (CEMP), was characterized by FTIR, 1 H NMR, 31 P NMR, XRD and SEM. The performance of CEMP and organic montmorillonite (OMMT) was evaluated in the substrate of epoxy resin (EP) with limited oxygen index (LOI), UL-94, cone calorimetric test (CCT), TGA and TG-IR. As a result, intumescent flame retardant EP (EP3) containing 30.6% LOI and V-0 rating was prepared by adding 3 wt% OMMT and 15 wt% CEMP. The CCT results indicated that CEMP and OMMT reduced the peak of heat release rate (PHRR) to about one fourth that of pure EP and total heat release (THR), 1/2. Decomposition of EP and EP3 was traced from 100 to 600°C by TG-IR.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Polymers
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2021
·Vol. 13
·期 22
·3962
·
IF 4.329
Abdul Shakoor Shar,Caili Zhang,Xieqing Song,Yunxuan Weng,Qiuyue Du
Polymer/clay composites are an innovative class of materials. In this study, we present a facile method for the preparation of biodegradable and robust PLA/organomodified montmorillonite (OMMT) composite films with excellent gas barrier performance. When the design of PLA/OMMT composite films, in addition to making OMMT have good intercalation effect in the matrix, the compatibility of intercalating polymer and matrix should also be considered. In this work, two polymers with high gas barrier properties, namely poly(vinyl alcohol) (PVA) and ethylene vinyl alcohol copolymer (EVOH), were selected to intercalate OMMT. The morphology and microstructures of the prepared PLA/PVA/OMMT and PLA/EVOH/OMMT composites were characterized by the X-ray diffraction measurement, scanning electron microscopy, and differential scanning calorimetry. It was shown that the good dispersibility of PVA in the PLA matrix, rather than the intercalation effect, was responsible for the improved gas barrier and mechanical properties of PLA/PVA/OMMT composite. The elongation at break increases from 4.5% to 22.7% when 1 wt % PVA is added to PLA/OMMT. Moreover, gas barrier of PLA/PVA1/OMMT measured as O2permeability is 52.8% higher than that of neat PLA. This work provides a route to intercalate OMMT interlayer with high gas barrier polymers and thus can be a useful reference to fabricate PLA/OMMT composites with improved gas barrier and mechanical properties. A comparison of oxygen permeabilities with existing commercial packaging films indicates that the biodegradable PLA/PVA/OMMT may serve as a viable substitute for packaging film applications.Keywords:poly(lactic acid);OMMT;gas barrier films;nanocomposites
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 18
·52064
·
IF 3.125
Xinjun Wang,Lijun Qian,Juan Li
Amino acid-triazine copolymer (CC-Lys) was prepared by using lysine (Lys) and cyanuric chloride (CC). The structure and performance of CC-Lys were tested by using Fourier transform infrared spectroscopy and thermogravimetric analysis. The CC-Lys, ammonium polyphosphate (APP) and organic montmorillonite (OMMT), were applied in ethylene-vinyl acetate (EVA) to improve its flame retardancy. The results showed that 20 wt% APP/CC-Lys/OMMT makes EVA achieve the UL-94 V0 rating. The reactions among APP/CC-Lys/OMMT release some incombustible gases and promote the formation of a porous char layer with good barrier performance during combustion. Moreover, the quality of the char layer is improved. In addition, the peak of heat release rate of EVA composite is reduced by 87% and time to ignition is delayed. This work provides a good flame retardant system for EVA.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 18
·16073-16086
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IF 2.22
Mao Yumeng,Yao Zhengjun,Zhou Jintang,Wei Bo,Lei Lei,Fan Huiyuan
In this work, stearyltrimethylammoium bromide (STAB) was used to modify montmorillonite (MMT). Subsequently, the modified organic montmorillonite (OMMT) was added into 4,4′-Bismaleimidodiphenyl methane (BDM) and 2,2′-Diallylbisphenol A (DBA) copolymerization system to prepare BDM/OMMT wave-transparent nanocomposites with 0–5 wt% OMMT content. It is found that the addition of OMMT improves the microstructure, thermal properties, and wave-transparent properties of BDM composites. At the addition of 2 wt%, the thermal stability of the resin system is the best, and the fracture morphology changes from brittle fracture characteristics to ductile fracture characteristics. Meanwhile, in X-band (8–12 GHz), OMMT-2 wt% with the thickness less than 2 mm or within 8–10 mm has excellent transmittance (> 90%). Moreover, the effect of temperature change on the wave-transparent performance of BDM/OMMT nanocomposites is investigated. From room temperature to 200 °C, the stability of high-temperature transmittance of OMMT-2 wt% is enhanced, and it still has good transmittance (> 90%) within in a wide thickness range at 200 °C. The enhancement of these properties is closely correlated with the interaction interface formed between OMMT and BDM resin matrix. The addition of OMMT can increase the design selection of BDM resin system and expand its application as a wave-transparent material.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2012
·Vol. 33
·期 2
·752-757
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IF 2.686
Yue Wu,Ninglin Zhou,Wenhao Li,Hao Gu,Yunting Fan,Jiang Yuan
Drug/metal ion complexes exhibit improved antimicrobial activity and intercalating the above complexes into the interlayer of clay endows a long-term and controlled-release behavior. In this study, chlorhexidine was first complexed with copper (II) ion and then intercalated into the interlayer of MMT to form chlorhexidine–copper (II)/montmorillonite (CHX–Cu/MMT) nanocomposites. The nanocomposites were characterized with Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). A nearly lateral-monolayer arrangement of CHX–Cu was supposed for the intercalation. Release kinetics indicated that the release process satisfied a pseudo-second-order mode. The antibacterial results showed that the CHX–Cu/MMT composites had long-term and controlled-release behavior.
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DOI
高影响因子
Coatings
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2024
·Vol. 14
·期 5
·546
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IF 2.9
Jun Xu,Dongyu Li,Hanli Wang,Bianli Quan
Organic montmorillonite (OMMT) was prepared from Na-montmorillonite (MMT) by Hexadecylamine (HDA) modification. The composite material has good smoothness, acidity, and salt resistance. OMMT was characterized using small-angle X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and a video optical contact angle measuring instrument. The results showed that the layer spacing was enlarged from 1.44 nm to 2.87 nm after the modification, and the hydrophobicity performance was greatly improved. The organic modification of MMT was successful. The surface morphology, roughness, and anticorrosion properties of the organic montmorillonite/epoxy (OMMT/EP) composite coating were investigated and compared with those of the epoxy (EP) coating. The OMMT/EP composite coating had a flatter surface than the EP coating. The roughness was reduced from 65.5 nm to 10.3 nm. The electrochemical impedance spectroscopy showed that the composite coating’s thickness positively affected its anticorrosion performance, the corrosion current density (Icorr) decreased with the increase in thickness, and its maximum impedance was much larger than that of EP coating. The protection efficiency of the OMMT/EP composite coating was 77.90%, which is a significant improvement over the EP’s 31.27%. In addition, the corrosion resistance of the composite coating gradually decreased with increasing immersion time, but the change was insignificant.
研究领域:
材料科学
·
腐蚀与防护
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 30
·e54102
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IF 3
Pengwei Wu,Jie Liu,Song Wang,Sanxi Li,Tao Tang
Organically modified montmorillonite (OMMT) and Ni 2 O 3 were simultaneously introduced into flame-retardant linear low-density polyethylene/ethylene-vinyl acetate/magnesium hydroxide (LEM) composites. Compared with the LEM composite, the thermal stability, and tensile properties of LEM/ remained basically unchanged when 5 wt% of OMMT/Ni 2 O 3 was substituted for MH. The LOI value increased a little from 27.2 to 27.7%. The data from cone calorimeter test showed that the first and second peak heat release rate was reduced by 19% and 67%, respectively. The total heat release and total smoke production showed a significant reduction by 18% and 36% after incorporation of OMMT/Ni 2 O 3 , respectively. The mechanism study indicated that the combination of OMMT/Ni 2 O 3 cooperates promote the carbonization of the polymer itself into carbon naotubes, which form a more cohesive char layer with magnesium hydroxide during combustion. This is the core factor responsible for the synergistic effect on reducing the heat release and smoke production in the LEM composite.
研究领域:
材料科学
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高分子化学
·
燃烧学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2018
·
IF 2.207
Shuo Yang,Xuan Li,Pei Yao
A new type of nanopolypyrrole/organically modified montmorillonite-ionic liquid gel polymer electrolyte (ppy/OMMT-ILGPE) is prepared based on nanopolypyrrole/organically modified montmorillonite (ppy/OMMT), N-butyl-N- methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PP14TFSI), lithium-bis(trifluoromethanesulfonyl) (LiTFSI), polyvinylidene difluoride (PVDF), methyl methacrylate (MMA), and benzoyl peroxide (BPO) by an in situ method. The effect of nano-ppy/OMMT on the physical and electrochemical properties of an ionic liquid gel polymer electrolyte is demonstrated. The results show that nano-ppy/OMMT-ILGPE has a porous structure with a large surface area, and the diameter of the pores on the surface is approximately 1-2 μm. The Li+ transference number of 0.72 is achieved, and the ionic conductivity reaches up to 1.2 × 10−3 S/cm at room temperature. Nano-ppy/OMMT-ILGPE has good thermal stability and mechanical properties. Meanwhile, nano-ppy/OMMT-ILGPE has fine cycle performance in the Linano-ppy/OMMT-ILGPELiNi1/3Co1/3Mn1/3O2 coin cell. The good electrochemistry performance of nano-ppy/OMMT-ILGPE means that it can act as an ideal gel polymer electrolyte material for lithium ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 16.8
Ya-Wei Zheng,Wan-Meng Song,Ying-Jun Xu,Yan-Peng Ni,Yun Liu
A novel biomass-based synergistic flame retardant PALAOMMT was prepared via a simple process for EP/RF composites. • PALAOMMT 3 (3% OMMT) enabled EP/RF to achieve LOI 34.6%, UL-94 V-0. • 3% OMMT mitigated the negative impact of PALA on mechanical properties through enhanced interfacial interactions. • This work provides a green halogen-free strategy for natural fiber-reinforced polymer flame retardancy. Despite their advantages, such as low cost and lightweight, the inherent flammability of ramie fiber-reinforced epoxy composites (EP/RF) significantly restricts their practical applications. To address this limitation, a high-performance flame retardant, designated as PALAOMMT, was synthesized, and the resultant flame retardant was employed to modify the surface of ramie fabrics, which were subsequently used to fabricate the corresponding EP/RF composites. The flame retardant containing 3% OMMT relative to PALA (referred to as PALAOMMT 3 ) exhibited the most outstanding flame-retardant performance. With a 20% weight gain of PALAOMMT 3 on the ramie fiber surface, EP/RF-PALAOMMT 3 achieved a limiting oxygen index of 34.6% and a UL-94 V-0 rating, with its peak heat release rates reduction of 27.2% and 44.3%, while the total heat release decreased by 36.8%. The incorporation of OMMT promoted the formation of a denser and more stable char layer, which provided an effective physical barrier in the condensed phase. This char layer markedly hindered heat conduction and suppressed the release of combustible volatile products. Thus, this work not only presents a novel and effective strategy for improving the fire safety of EP/RF composites but also identifies key directions for the synergistic optimization of flame retardancy and mechanical properties in future research. Download: Download high-res image (523KB) Download: Download full-size image
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DOI
高影响因子
Journal of Nanomaterials
·
2017
·
IF 1.871
Shuo Yang,Huiya Qin,Xuan Li,Huijun Li,Pei Yao
Nanopolypyrrole/organic montmorillonite- (nano-ppy/OMMT-) coated separator is prepared by coating nano-ppy/OMMT on the surface of polyethylene (PE). Nano-ppy/OMMT-coated separator with three-dimensional and multilayered network structure is beneficial to absorb more organic electrolyte, enhancing the ionic conductivity (reach 4.31 ). Meanwhile, the composite separator exhibits excellent thermal stability and mechanical properties. The strong covalent bonds (Si-F) are formed by the nucleophilic substitution reaction between F− from the thermal decomposition and hydrolysis of LiPF6 and the covalent bonds (Si-O) of nano-ppy/OMMT. The Si-F can effectively prevent the formation of HF, POF3, and LiF, resulting in the inhibition of the disproportionation of Mn3+ in LiNi1/3Co1/3Mn1/3O2 material as well as reducing the internal resistance of the cell. Therefore, the nano-ppy/OMMT-coated separator exhibits outstanding capacity retention and cycling performance at 80°C.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）