ACS Applied Polymer Materials
·
2024
·
IF 4.4
Shuolei Wang,Wenjun Wang,Zhonggui Zhang,Xiaojian Jiang,Ziyue Zhang,Hongyu Gao,Shi Xu,MD Zahidul Islam,Yaofeng Zhu,Yaqin Fu,Qingqing Ni,Yubing Dong
In this study, we developed composite fibers composed of silver (Ag)/boron nitride (BN)/ethylene-vinyl acetate copolymer (EVA) utilizing a combination of melt spinning–UV irradiation and chemical Ag-plating techniques. The inclusion of the BN filler was aimed to enhance the thermal conductivity and accelerate the response of EVA, while the application of a nano-Ag coating provided the fiber with high electrical conductivity. The results indicated that the electrical conductivity of the Ag/BN/EVA composite fiber achieved a notable value of 2.47 × 104 S/m. These composite fibers exhibited exceptional two-way shape memory properties, electrothermal conversion characteristics, and electrically driven actuation capabilities. Significantly, we demonstrated that by applying a voltage of merely 2.5 V, it was possible to precisely control the electrically reversible driving strain of the Ag/BN/EVA composite yarn by adjusting the energization time, resulting in an impressive energy density of 99.96 J/kg under a loaded weight (34.50 g), which is approximately 4107 times its own weight (0.0084 g). This led to the development of a composite yarn artificial muscle with a high load-bearing capacity, remarkable energy density, and low driving voltage requirements.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Heping Zhang,Wenpu Zhang,Mingwei Hu,Yiqi Tang,Gongcheng Xu,Xinghui Hou,Ying Zhou
Ethylene Vinyl Acetate (EVA) has been widely used in various industries for its excellent flexibility and corrosion resistance. However, its high flammability poses significant safety risks, necessitating the incorporation of flame-retardants to improve its fire resistance. This study focuses on the wet surface modification of magnesium hydroxide (MH) using n-octyl triethoxysilane (OTES). The hydrolysis products of OTES react with the OH on the MH surface to form Si O Mg bonds, thereby enhancing the surface hydrophobicity and compatibility with EVA. MMH was incorporated into EVA, and the resulting composites were characterized using XRD, SEM, TG, BET, FT-IR, and XPS. The optimal modification conditions were achieved with an OTES dosage of 3 wt% at 45 °C for 60 min, yielding a contact angle of 142°, an activation index of 98.12%, and an oil absorption rate of 43 mL/100 g. The EVA/MMH composites demonstrated superior thermal stability and flame retardancy compared to unmodified EVA. Specifically, the limiting oxygen index (LOI) of EVA/MMH-55 reached 34.9%, and it achieved a UL-94 V-0 rating, indicating excellent self-extinguishing properties. This study provides a novel approach for the surface modification of MH, offering a practical solution to enhance the flame retardancy and thermal stability of EVA composites. Highlights Hydrophobic MMH is obtained by wet surface coating modification of MH by OTES. Contact angle of MMH is 142° under optimal modification conditions (60 min, 45 °C and 3 wt%) The chemical reaction process between OTES and the MH surface has been analyzed, revealing the mechanism by which the Si OH groups on OTES react with the OH groups on the MH surface to form Si O Mg bonds, which intertwine to form a hydrophobic layer. The specific surface area of MMH is reduced, and it has good compatibility with EVA resin. The LOI of EVA/MMH-55 is 34.9%, making it a nonflammable material.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 4
·1-14
·
IF 23.2
Wang Ping,Tian Hongyu,Liu Wenxiu,Lu Haibing,Liu Jiajia,Dong Shi,Xu Jie,Cao Tian,Shi Min,Huang Haopeng,Zhou Yiyang
By structural design, a new type of highly functional ionic liquid (NHFIL) was synthesized by combining 1-vinylimidazole with tris(2-chloroethyl) phosphate through a one-pot method. When it is melted into the polymer composite, the highly reactive vinyl of NHFIL promotes the cross-linking within the polymer system to enhance the compatibility between the inorganic filler and polymer matrix and further improve the mechanical properties of the composite, additionally, the N and P elements would generate non-flammable gas phase and carbonized layer during combustion, which endows the polymer composites with remarkable flame-retardant performance. On this basis, the low-smoke flame retardant ethylene–vinyl acetate (EVA)-based composites were prepared by introducing NHFIL into the industrial formula of the cable sheath material for maglev trains. The effects of the composition and molecular structure of NHIFL on the interfacial compatibility, microstructure, mechanical properties, and flame retardancy of composite materials have been studied in detail. The results indicate that with the addition of NHFIL, the cross-linking degree, gel content, thermal stability, mechanical properties, oil resistance, and the flame retardancy of the EVA-based composites were comprehensively improved. Significantly, with a low addition of 3.5% NHFIL, the gel content reaches 90.3%, the carbon residue reaches 42.7%, and the limiting oxygen index (LOI) reaches 36.3%, and surprisingly, the oil resistance increased by five times, which endows the composites with great application potential in cables of major transportation equipment.
研究领域:
材料科学
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高分子化学
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交通运输工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1019-1035
·
IF 4.682
Wang Zhen,Tao Jie,Shen Yizhou,Liu Senyun
Composite film heater is becoming the focus of research in the deicing field, owing to its advantages of high electro-thermal efficiency and lightweight. In this work, a new composite film heater with ultralow conductive filler was designed and prepared by mixing insoluble ethyl vinyl acetate (EVA) and soluble polyvinylidene fluoride (PVDF) in dimethylformamide (DMF). It is common sense that many insoluble EVA fillers degrade mechanical properties due to the macro-interface defect. The molecular dynamic simulation indicated that interfacial blending regions were formed more easily between molten EVA and soluble PVDF on account of the similar solubility parameter and stronger adsorption energy between Vinyl acetate segmer and PVDF segmer. The semi-compatible system was favorable to eliminate the macro-interface defect between EVA and PVDF partially. The film heater showed better tensile strength, flexibility, and bending durability after heat treatment of 80 °C. Moreover, the film heater had an outstanding heating effect, fast electro-thermal response time, low-energy consumption, and excellent thermal cycling stability. It achieved the steady-state temperature of 117.4 °C and the heating rate of 1.348 °C/s when the ratio of PVDF to EVA was 1:1 and the amount of CNT was only 10% at 28 V. The optimal ratio of CNT and EVA could construct a double reticular structure, consists macroscopic and microscopic conductive network at the same time, thereby reducing the content of conductive filler significantly. Furthermore, the deicing experiment manifested that the icicle fell after 29 s at 28 V, much shorter than without loading current. The integrated CNT@EVA/PVDF composite film heater contributes to a better understanding of the low percolation effect and the distribution mechanism between molten EVA and soluble PVDF, which could conduce to the development of novel electro-thermal deicing film in future.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Tongwei Zhang,Huijie Qin,Lihong Bao,Mingkao Xu,Bo Dang,Jianxi Li
Two-dimensional molybdenum disulfide (MoS 2 ) nanosheets are seen as highly promising nanofillers for enhancing polymer properties, yet there is a need for methods that are low-cost, simple, and environmentally friendly to facilitate the large-scale production of MoS 2 nanosheets. Furthermore, it is necessary to functionalize the MoS 2 surface to ensure good interfacial compatibility with the polymer matrix. In this study, MoS 2 @Ag@PA hybrids were created by generating silver nanoparticles directly on the surface of MoS 2 via radiation, followed by encapsulation on the surface of MoS 2 @Ag through the chelating properties of phytic acid. It is significant to note that, due to the excellent lubrication and physical cross-linking effects of the MoS 2 @Ag@PA hybrids, adding one part of MoS 2 @Ag@PA hybrids can enhance the melt flow rate and elongation at break of the ethylene vinyl acetate copolymer (EVA)/MH composites by 140% and 17.3%, respectively. The simultaneous addition of one part of MoS 2 @Ag@PA hybrids decreased the peak heat release rate, total heat release, and total smoke release of the EVA composites by 48.7%, 42.7%, and 41.2%, respectively. Moreover, the toxic gasses (e.g., CO) generated by burning EVA composites were significantly reduced compared to pure EVA, indicating improved fire safety. This research not only provides significant opportunities for the green mass production of MoS 2 nanosheets but also expands their potential applications in high-performance nanocomposites.
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
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 17
·175404
·
IF 2.9
Yafei Xu,Cong Yan,Hongfei Liang,Sheng Huang,Ping Feng,Jian Song
Silicon solar cell is the most mature photovoltaic conversion device, and in order to further improve the performance of the device, application of downshifting films has become a research hotspot. In this paper, CsPbBr3 perovskite quantum dot/EVA composite adhesive film was prepared by melting method with CsPbBr3 perovskite quantum dot film under solution processing as masterbatch and EVA particles as excipient. The effect of synthesis conditions on the luminescence properties of the composite films were thoroughly studied. The optimized CsPbBr3 perovskite quantum dot/EVA composite adhesive film has excellent performance, and its light transmission reaches 85%. The CsPbBr3 perovskite quantum dot/EVA composite adhesive film absolutely improves the efficiency of silicon solar cells by 1.08%, which is much higher than that of pure EVA adhesive film (0.63%). In addition, the device efficiencies have almost no change after 30 d in the air, maintaining the working stability of the device and contributing to industrial applications. This study provides a novel, industrial and low-cost synthesis route for the synthesis of CsPbBr3 perovskite quantum dot/EVA composite adhesive film, which is expected to have broad application.
研究领域:
材料科学
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光伏技术
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纳米技术
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 26
·e05212
·
IF 2
Yan Jiang,Yue Sun,Jie Zhang,Hongmei Zhao,Changhai Xu,Jinmei Du,Luyue Jia,Dagang Miao
Graphical In this study, we synthesized an anionic polyacrylate water repellent and for the first time utilized it to enhance the moisture permeability in PVC/EVA membranes. The common polyvinyl chloride (PVC) gloves affect moisture and air permeability due to their dense nature, affecting the wearing comfort. Inspired by moisture-permeable fabrics, this study was conducted to enhance the moisture permeability of PVC/EVA membranes by introducing ethylene vinyl acetate copolymer (EVA) blended with PVC to form a membrane and coating one side of the membrane with a polyacrylate water repellent. The experimental results showed that the water contact angle of the upper (85°) and lower surfaces (99.4°) of the PVC/EVA membrane produced a significant difference. This difference endows the membrane with different wettability.The water vapor transmission of the membranes increased from the initial 163.25 g/m 2 ·24h to 862.9 g/m 2 ·24h. The moisture permeability and thermal conductivity of PVC/EVA membranes were significantly improved. After 30 min in the thermal conductivity test, the temperature of the palm covered with PVC/EVA membranes reached 34.7 °C, which was 0.8 °C higher than that of the palm covered with pure PVC membranes. The SEM images show that the PVC/EVA membrane generated more particles and pores. The results of XRD, TG/DTG, and tensile tests showed that the crystal structure and mechanical strength of the membranes remained unchanged, while their thermal stability improved.
研究领域:
高分子科学
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材料工程
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表面化学
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热分析
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膜技术
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产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2025
·Vol. 36
·期 2
·1-13
·
IF 3.8
Xu Si-Yi,Li Dan-Yi,Wang Wen-Rui,Lin Lin,Sun Ying,Li Ji-Hao,Li Lin-Fan
High-performance MXene-based polymer nanocomposites are well-suited for various industrial applications owing to their excellent mechanical, thermal, and other properties. However, the fabrication of flame-retardant polymer/MXene nanocomposites remains challenging owing to the limited flame-retardant properties of MXene itself. This study prepared a novel MXene@Ag@PA hybrid material via radiation modification and complexation reaction. This material was used to further enhance the key properties of ethylene-vinyl acetate (EVA), such as its mechanical properties, thermal conductivity, flame retardancy, and electromagnetic shielding. The addition of two parts of this hybrid material increased the thermal conductivity of EVA by 44.2% and reduced its peak exothermic rate during combustion by 30.1% compared with pure EVA. The material also significantly reduced smoke production and increased the residue content. In the X-band, the electromagnetic shielding effectiveness of the EVA composites reached 20 dB. Moreover, the MXene@Ag@PA hybrid material could be used to further enhance the mechanical properties of EVA composites under electron-beam irradiation. Thus, this study contributes to the development of MXene-based EVA advanced materials that are fire-safe, have high strength, and exhibit good electromagnetic shielding performance for various applications.
研究领域:
材料科学
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高分子化学
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火灾安全工程
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电磁学
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
In this study, MXene@Ag@PA hybrids were synthesized using radiation methods and chelation, aiming to enhance the key properties of EVA/MH composites, particularly their flame retardancy. The test results demonstrated that the addition of MXene@Ag@PA hybrids effectively reduced the amount of heat and smoke released during the combustion process of EVA composites. When 2 parts of MXene@Ag@PA hybrids were added, the peak heat release rate (pHRR) of the EVA/MH/2.0MXene@Ag@PA composite was reduced to 233 kW/m², representing a decrease of 78.5% and 63.3% compared to pure EVA and EVA/MH composites, respectively. Additionally, the time to reach the peak heat release rate was delayed to 300–400 s. Moreover, the MXene@Ag@PA hybrids further reduced the total smoke production (TSP) of the EVA composites to 3 m², which is 50% and 38.7% lower than that of pure EVA and EVA/MH composites, respectively. Besides providing significant flame-retardant enhancement to EVA/MH composites, the MXene@Ag@PA hybrids also acted as a radiation sensitizer. At an irradiation dose of 100 kGy, the addition of MXene@Ag@PA hybrids enhanced the cross-linking effect of EVA composites, thereby strengthening their mechanical properties.
研究领域:
材料科学
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聚合物工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Chunmu Wang,Jiahua Lu,Jie Zhu,Jujun Ruan
Decapsulation constitutes the critical initial phase in the recycling of waste photovoltaic (PV) laminated modules. Wet decapsulation has emerged as a prominent research focus. However, the underlying removal mechanisms of ethylene-vinyl acetate (EVA) encapsulants remain insufficiently characterized, and the optimal solvent has not been selected. This article introduces a green alternative solvent terpinolene to decapsulate waste PV laminated modules. The decapsulation parameters were optimized. The waste PV laminated modules could be completely decapsulated under the identified optimal conditions: 2 cm × 2 cm specimens treated with 90 wt% terpinolene solvent under 800 W ultrasound agitation for 55 min. This study reveals the decapsulation mechanism: the ultrasonic field caused the water and terpinolene to produce O· and groups containing methylene radicals. The free radicals approached the directional C-C and C-O bonds in the bridging structure and the directional C-C bonds in the backbones of EVA and oxidized them to make them interrupt and to be grafted. EVA molecules were broken into multiple and smaller organic molecules, resulting in a swelling effect and loss of viscosity, thus prompting the laminated modules to decapsulate. We report for the first time the use of the green solvent terpinolene coupled to ultrasonic efficiently decapsulating waste photovoltaic laminated modules. And this study pioneers the discovery of the infinite swelling induced by terpinolene-mediated radical reactions in PV EVA encapsulants. It provides scientific information and key technologies for the decapsulating of waste PV laminated modules, the recycling of materials and the closed-loop development of PV industry.
研究领域:
环境科学
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材料回收
·
清洁能源技术
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高分子化学
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可持续工程
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工业生态学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibo Zhao,Hengbin Mao,Weishan Ma,Mingliang Li,Shao Gang,Bingbing Fan,Hailong Wang,Hongliang Xu,Hongxia Lu
All-inorganic halide perovskite nanocrystals (NCs) have attracted much attention in many fields. However, the poor stability of NCs and the toxicity of Pb have greatly hindered their practical applications. Reducing the proportion of Pb with the concept of high-entropy and coating NCs with an outer layer have been regarded as effective strategies to solve the problems. Herein, We have successfully synthesized the all-inorganic high-entropy dual-phase Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 )Br 3 /Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 ) 2 Br 5 (Cs‘B’Br 3 /Cs‘B’ 2 Br 5 ) perovskite NCs with good luminescence properties by a high-energy ball milling method; On the basis of which, Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs are coated with SiO 2 and EVA resin. Due to the amorphous SiO 2 protection, the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 @SiO 2 NCs maintained 93% of their emission intensity after 90 days compared to their uncoated counterparts. The PL intensity of Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA was significantly enhanced by a factor of 4.7 for compared to the uncoated NCs. In addition, the PL emission intensity of the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA remained 93.7% after 90 days, and the emission peak intensity remained approximately 63% after 8 h of placement in an enclosed environment at 80% humidity through the dense polymer chains and the hydrophobic nature of the film. Finally, the film could expand its application prospects in the field of flexible device.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2024
·Vol. 57
·期 32
·325302
·
IF 3.1
Siyi Xu,Danyi Li,Wenrui Wang,Lin Lin,Ying Sun,Jihao Li,Linfan Li
A large amount of toxic smoke and heat generated by the combustion of ethylene vinyl acetate copolymer (EVA) poses a significant threat to human fire escape evacuation. This work aims to use γ-ray to prepare e-MXene@Ag hybrid flame-retardant materials by the method of in-situ reduction, and EVA composites are prepared by melt blending to reduce the smoke and toxic gases produced during combustion significantly. Compared with pure EVA, the total heat release, total smoke release, and the production rate of CO and CO2 produced by the combustion of EVA composite with 1 wt% e-MXene@Ag1.0 decreased by 30.3%, 33.3%, 18.2%, and 20.1% respectively. The fire hazard reduction of EVA composite materials was due to the physical barrier, catalytic carbonization and adsorption of the e-MXene@Ag1.0 hybrid. In addition, e-MXene@Ag1.0 can also further increase the mechanical properties of EVA composites due to its own 'multi-contact point limit structure'.
研究领域:
材料科学
·
燃烧学
·
环境科学
✓ 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）