MACROMOLECULAR MATERIALS AND ENGINEERING
·
2023
·Vol. 308
·期 9
·2300036
·
IF 3.9
Bingqing Quan,Mingchao Wang,Xinpeng Hu,Chuanbiao Zhu,Shuang Liu,Hao Wu,Lei Wu,Xiaolong Li,Xin Chen,Xiang Lu,Jinping Qu
The working electronic devices and batteries generate a lot of heat, if this heats not release quickly, it will not only have a great impact on the performance of the devices, but also cause certain safety hazards. The passive thermal management based on organic phase change materials (PCMs) stands out due to its excellent temperature regulation capability as well as the buffer protection capability for device overload. In view of these, a series of flexible EVA/EG@PW (EE@P) phase change composites (PCCs) with high thermal conductivity are prepared by efficiently constructing porous skeletons and thermal conductive pathways through sacrificial template method, and introducing paraffin wax (PW) by simple vacuum impregnation technique. The PCC exhibits high thermal conductivity (2.6 W m −1 K −1 ), high enthalpy (153.5 J g −1 ), and good flexibility. In addition, the PCC possesses excellent cycling stability and thermal stability. In practical application, the PCC shows good temperature control ability for LED and shows great potential application in the field of thermal management.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Liting Xu,Ruping Lu,Tingting Wang,Wei Liu,Yi Li,Yonggang Yang
Materials exhibiting circularly polarized luminescence (CPL) hold great potential for three-dimensional (3D) displays, anticounterfeiting, and optoelectronics. However, research on broadband CPL is still limited. Herein, a MnII complex with a green emission band and high quantum yield was synthesized and doped into an EVA matrix to create a luminescent EVA-MnII layer. In combination with the cholesteric liquid crystal polymer network (CLCN) film, CPL-active composite films with high |glum| values (up to 1.34) were obtained. Furthermore, when a luminescent EVA-MnII/EVA-EuIII layer emitting both red and green fluorescence was stacked with a CLCN film with double reflection bands, high |glum| values (|glum| > 1) in a broad CPL band range (490–710 nm, Δλ > 200 nm) were achieved. Based on the chiral optical filtering effect of CLCN films, this work not only tuned the CPL handedness and achieved high |glum| values but also developed a method for broadband displays and anticounterfeiting.
研究领域:
材料科学
·
光电子学
·
光学
·
化学
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Bo Cheng,Yaru Sun,Wenyuan Zhang,Wenchao Zhang,Dinghua Li,Rongjie Yang
The heat accumulation caused by the high-power consumption of continuously upgrading electronic devices puts forward more requirements for efficient heat dissipation and fire safety of insulating materials. Herein, a bio-based flame retardant functionalized boron nitride nanosheet (BNNS@PP-Fe) was prepared via a simple mechanical exfoliation and self-assembly technology for reduction in the fire hazards of ethylene-vinyl acetate copolymer (EVA), as well as the improvement of its thermal conductive and mechanical performances. Arising from the highly flat oriented structure and rich flame-retardant functional groups of BNNS@PP-Fe, as well as the high compatibility between filler and matrix, the EVA/ATH/4BNNS@PP-Fe composites exhibited high thermal conductivity (0.78 W/(m K)) and outstanding flame retardancy with a dramatic decrease in peak heat release rate (p-HRR, 135.2 kW/m 2 ) and total heat release rate (THR, 60.3 MJ/m 2 ). Compared to neat EVA, the p-HRR and THR values of EVA/ATH/4BNNS@PP-Fe composite significantly decreased by 76.5% and 47.3%, respectively. Additionally, the flat-oriented structure and strong interfacial interaction also endow EVA/ATH/4BNNS@PP-Fe composites with excellent mechanical properties. This work provides a facile pathway to fabricate multifunctional BNNS and will promote the development of commercial insulating materials, not just EVA.
研究领域:
材料科学
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高分子科学
·
纳米技术
·
消防安全工程
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 64
·34161-34167
·
IF 3.708
Wenpeng Ding,Juan Li,Kang Tao
Solid super acid (SSA) as a kind of green catalyst was introduced into conventional intumescent flame retardant (IFR)/ethylene-vinyl acetate (EVA) composites to increase their flame retardant efficiency. The IFR used was a combination of ammonium polyphosphate coated by melamine resin (MAPP) and pentaerythritol (PER) with weight ratio at 3 : 1. TGA results showed that the SSA promoted the reaction between MAPP and PER. The thermal degradation temperature of the IFR/EVA composites with 1.5 wt% SSA was significantly increased by 95 °C compared to that of IFR/EVA. The UL 94 V-0 rating can be achieved for EVA composites with 13 wt% total amount of IFR and SSA, while the EVA composites with individual 13 wt% IFR only passed the UL-94 V-2 rating. The char residues at 800 °C of SSA/IFR/EVA composites were 5.8 wt%, which was higher than 2.4 wt% of IFR/EVA composites. Many carbon microspheres were observed by SEM which were deposited in the char matrix after the cone calorimeter test. These carbon microspheres had better graphite structure, thus the char was strengthened and could resist more heat and gas flow erosion. The synergistic effect between the gas phase and condensed phase was considered the main factor for the increase of flame retardant properties.
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
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 10
·1-10
·
IF 2.6
Yang Lei,Gao Lijing,Wei Ruiping,Xia Rongying,Wang Ziqi,Liu Huijun,Yao Mingzhu,Ma Guanghui,Xiao Guomin
Ethylene-vinyl acetate (EVA)grafted 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (V4) polymer EVA-g-V4 was prepared by free-radical solution grafting reaction. The results of the purified grafted products by FT-IR, 1 H NMR, XRD, TG and DSC show that V4 has been successfully grafted onto the main chain of EVA. The effects of the dosage of V4 and BPO on grafting ratio were studied. When the dosage of V4 was 6.0 wt%, and the dosage of BPO was 0.8 wt%, the grafting ratio was up to 1.4%. The cross-linking behaviour was verified by SEM. Compared with pure EVA film, the peel strength, mechanical properties, volume resistivity and hydrophobicity of EVA-g-V4 film all improved with increasing grafting ratio. This work provides a new option in the field of photovolatic encapsulation materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Xiaojing Duan,Jiachen Zhu,Chenyang Li,Huidong Fang,Wanji Zhou,Shiai Xu
A mussel-inspired polydopamine-assisted layer-by-layer assembly combined with a metal-chelating strategy using phytic acid was employed to synthesize a novel multi-level core-shell magnesium carbonate-based flame retardant (AMC@PDA@PA-Ni) for enhancing the fire safety of ethylene vinyl acetate (EVA) copolymers. The incorporation of 50 wt% AMC@PDA@PA-Ni increased the LOI of the EVA composite to 30.3 %, achieving a UL94 V-1 rating. Compared to pristine EVA, the composite exhibited a 63.3 % reduction in peak heat release rate (pHRR) and a 66.7 % decrease in peak smoke release rate (pSPR). At elevated temperatures, the combined effects of AMC's gas-solid phase flame retardancy, the phosphorus-containing flame retardant's quenching action, and the transition metal nickel's catalytic charring capability significantly contributed to the composite's superior fire resistance. Additionally, the tensile strength of the EVA/AMC@PDA@PA-Ni composite increased by 97.6 % relative to EVA/AMC, attributed to the PDA modification, which enhanced filler dispersion and interfacial adhesion. This study introduces a facile and effective strategy for developing bio-based multi-level core-shell hybrid flame retardants with outstanding fire resistance and mechanical strength retention.
研究领域:
材料科学
·
火灾安全工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
The high flammability of ethylene vinyl acetate copolymers (EVA) limits its important applications in fire safety, and the addition of highly effective flame retardants can improve this deficiency. Melamine cyanurate (MCA) has limited carbon-forming ability and therefore is often combined with other flame retardants to achieve synergistic flame retardant effects and thus improve the flame retardancy of EVA. Therefore, in this study, MoS 2 @Fe 3 O 4 hybrid materials were synthesized by in-situ growth of molybdenum disulfide (MoS 2 ) and ferric oxide (Fe 3 O 4 ) and their structures were characterized using various techniques. The hybrids were blended with melamine cyanurate (MCA) into ethylene vinyl acetate copolymer (EVA) by melt blending method to reduce the fire hazard. The EVA composites with 1.0 wt% MoS 2 @Fe 3 O 4 blends significantly improved the coke residue and limiting oxygen index values to 22.5 % and 23.2 %, while their peak heat release rate, total heat release, and total smoke release were reduced by 62.5 %, 11.7 %, and 35.3 %, respectively, as compared to pure EVA. The results suggest that the use of MoS 2 @Fe 3 O 4 hybrids in combination with MCA is a promising strategy for the development of advanced flame-retardant materials.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
产品关联
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2025
·
IF 10.9
Yusen Wu,Jiahua Lu,Keyi Lin,Jujun Ruan
With the development of the new energy industry, a large number of photovoltaic modules are produced, used, promoted, and will reach the end of their life cycle shortly. The recycling of photovoltaic modules is an important work in the closed-loop development of the new energy industry, and the first step of recycling is decapsulation. Hydrometallurgical decapsulation has been considered an important recovery method due to energy saving and the ability to recover all components of photovoltaic laminates. However, the problems of low decapsulation efficiency and pollutant discharge need to be solved. This article reports a new green linalool solvent employed for decapsulation. The experimental results show that the delamination rate of the glass of the laminates with particle sizes of 0.5, 1, 2, and 3 cm can all reach 100% in 4 hours. Furthermore, we propose a strategy to improve the efficiency of decapsulation by enhancing the bond-breaking tendency of the crosslinking bridge formed by the coupling agent in the EVA-glass interface. It indicates that the Lewis acid properties of Al 3+ and its coordination effect with nitrogen atoms promote the hydrolysis of C N bonds in the amid group. The increase of decapsulation efficiency by adding Al 3+ increases with the decrease of laminate particle size. When the particle size is 0.5 cm and 1 cm, the efficiency is increased nearly two times. This study provides a new idea for improving the green attributes and efficiency of hydrometallurgical decapsulation of photovoltaic laminates.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Songchao Zhang,Tongbing Li,Zhenyu Zhang,Haosen Ma,Yu He,Xiwen Zhang,Xiangdong Liu
Ethylene-vinyl acetate (EVA) is widely used but suffers from high flammability, poor thermal stability, and low hardness. It is often blended with polyethylene (PE) and flame retardants to improve performance, yet this often causes poor synergy and uneven filler distribution. In this study, vinyl acetate (VA) is grafted onto PE via melt grafting to obtain PE-g-VA, which combines the mechanical strength of PE with the polar dispersion of VA. When compounded with aluminum hydroxide (AH), PE-g-VA/AH achieves a limiting oxygen index of 32.1% and a UL-94 V-0 rating without melt dripping. Compared with EVA/PE/AH, PE-g-VA/AH shows 37.2% higher tensile strength and reductions of 33.3% (PHRR), 26.7% (THR), 36.9% (PSPR), and 60.7% (TSP). These improvements arise from the VA side chains, which enhance AH dispersion and char layer integrity. This work provides a feasible matrix-modification strategy for high-performance flame-retardant composites.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Zhongming Li,Qi Liu,Shan Tang,Dong Feng,Wenbo Zhao,Bin Li,Delong Xie,Yi Mei
It is significant to develop high-efficient fire retardants all the time. Ethylene vinyl acetate (EVA) features flammability and poor fire resistance ability, which severely hindered its extensive application with advanced requirements. Herein, a novel strategy was proposed to combining long chain phosphaphenanthrene grafted MXene (DPP-MXene, also donated as DM) and black phosphorene nanosheets (BP) with EVA to fabricate EVA/DMBP nanocomposites with high fire resistance. Thermogravimetric analysis (TGA) proved that DMBP synergistic system can significantly improve the thermal stability and char forming ability of EVA as proved by delayed thermal decomposition temperatures . The combustion test results suggested that the addition of 3 wt. % DMBP into EVA matrix can induce the EVA/DMBP-3 composites with favorable flame resistance property, the UL-94 V-0 rating and limiting oxygen index (LOI) value (26.7 %) was achieved for the EVA/DMBP-3 components, and significantly decrease in total heat release (THR) (21.5 %) and peak heat release rate (PHRR) (48.1 %) were achieved by addition of 3 wt. % DMBP into EVA elastomer , indicated its incombustible nature. Furthermore, it was found that the incorporation of DMBP synergistic system only yielded the EVA/DMBP-3 composites with slight reduction of the tensile strength and elongation at break as compared to neat EVA. The high efficiency of the prospect flame retardant provided a competitive candidate material for EVA towards wide applications.
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
SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Shuolei Wang,Wenjun Wang,Zhangyi Chi,Zhaomeng Long,Huaizhong Xu,Yubing Dong
Generally, the shape memory polymers (SMP)-based information carriers are strongly dependent on the integrity of their bodies, and once the information carriers are damages, their information is lost. In this study, the carbon nanotubes/ethylene-co-vinyl acetate (CNTs/EVA) SMP composite based information carriers with electric- and light-driven modes were prepared by hot-pressing and swelling ultrasonic method. The embedded CNTs layer on the surface of the composites provided condition for Joule effect , which enabled the composites to achieve electric-driven recovery at 50 % pre-strain and could lift 857 times their weight. Since the composites had crystallization-induced elongation and melt-induced contraction performance, the strain range could be accurately controlled by the programmed control of the power supply to achieve information transmission . Combined with the function of strain sensing, the strain signals were generated by the electric-driven and the resistance signals were generated by the light-driven were used as the communication symbol, which are not limited by their physical integrity. This study provides an experimental reference for SMP with multiple driving modes and driving-sensing integration functions, enriches the SMP-based information carrier's processing and transmission modes, and expands the function and application field of SMP.
研究领域:
材料科学
·
智能材料
·
信息功能材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yao Yuan,Bin Yu,Libi Fu,Haibo Sheng,Wei Wang
In this work, an innovative methodology for enhancing the fire safety of EVA/EPDM (EE) composites by employing an in-situ encapsulation technique to integrate magnesium hydroxide (MH) within the mesoporous hydroxystannate ferrate (mHSF) framework via ion-driven self-assembly. Comprehensive characterization involving X-ray diffraction, scanning electron microscopy, and transmission electron microscopy was employed to investigate the structure, elemental composition, and morphology of the resulting hybrids. In comparison to EE/MH composites, the MH@mHSF hybrids exhibited favorable dispersion within the EE matrix, demonstrating minimal aggregation. Upon incorporation of MH@mHSF hybrids, a significant reduction in peak heat release rate and total heat release (73.5 and 50%) compared with pristine EE, and an achievement in limiting oxygen index value of 32.5% from 19% for pristine EE was achieved. Notably, when contrasted with the findings of EE/MH/mHSF, the EE/MH@mHSF composite showcased superior tensile strength and enhanced fire safety properties. This improvement can be ascribed to the catalytic charring behavior and adsorption effects facilitated by well-dispersed MH@mHSF hybrids within the polymer matrix. Thermogravimetric analysis/infrared spectrometry (TG-IR) corroborated a substantial reduction in organic volatiles and the suppression of carbon monoxide emissions upon integration of MH@mHSF hybrids, underscoring the alleviation of fire hazards. The observed synergy of the catalytic and adsorption effects of mesoporous HSF, combined with the flame-retardant characteristics of MH, plays a pivotal role in the suppression of smoke generation.
研究领域:
材料科学
·
消防安全
✓ 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）