CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Xingkun Zhu,Nan Zou,Hongchang Pang,Peng Tian,Guiling Ning
A high-efficient composite of flame retardant (CFR) composed of an aluminum hydroxide (ATH) core and an aluminum phosphate (AP) flower-like shell was synthesized by an in-situ growth method, which is low cost and easy-to-handle. It has been demonstrated that flame retardancy and smoke suppression of (ethylene-vinyl acetate) EVA/CFR were enhanced compared to EVA/ATH attributed to the high-efficiency heat barrier and gas isolation of ceramic char residues mainly composed of Al 2 O 3 porcelain agents and AlPO 4 sintering aids. Thus, the novel hierarchical core-shell AlPO 4 @Al(OH) 3 might supersede the ATH as flame retardants.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Chengxue Li,Xiaojian Jiang,Jianhong Liu,Chunhui Zhang,Chunxiu Liu,Huikai Nan,Yubing Dong
To extend the service life of shape memory ethylene-vinyl acetate (EVA), the titanium dioxide/reduced graphene oxide/EVA composites (TiO 2 -P/rGO/EVA and TiO 2 -PF/rGO/EVA) were prepared by an impregnation method and modified with triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane and 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane as hydrophobic agents, respectively. The hydrophobic/anti-icing properties, surface durabilities, shape memory properties, and UV-aging resistance of the composites were systematically investigated. The TiO 2 /rGO/EVA composites exhibit exceptional hydrophobic and anti-icing performance. The TiO 2 -P/rGO/EVA composites and TiO 2 -PF/rGO/EVA composites displayed water contact angles of 150.7° and 152.2°, respectively, with sliding angles of 6.4° and 4.9°, and both retained these values after durability tests. Frozen droplets on the TiO 2 -P/rGO/EVA composites could melt and slide off after 36 s of NIR irradiation. The composite displayed outstanding two-way shape memory behavior with multi-stimuli responsiveness, achieving reversible deformation under either 40 V electrical stimulation or NIR irradiation. It also possessed near-complete UV shielding (≈ 100%) and remarkable UV resistance: after 14 days UV exposure, it maintains 22.10% reversible strain and 99.35% shape recovery ratio; after 28 days, relative electrical conductivity remains at 87.5%. Hydrophobicity persists for over 48 h under UV irradiation in N 2 atmosphere. Furthermore, the TiO 2 /rGO/EVA composites surface wettability can be modulated through UV irradiation-washing-recoating cycles.
研究领域:
材料科学
·
智能材料
·
聚合物复合材料
·
刺激响应材料
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Chenhao Ren,Yao Huang,Wenkui Hao,Dawei Zhang,Xiejing Luo,Lingwei Ma,Jinke Wang,Thee Chowwanonthapunya,Chaofang Dong,Xiaogang Li
In this study, a new self-healing strategy that can simultaneously recover the corrosion resistance and the adhesion strength of coatings was introduced. The coating was based on a shape memory epoxy resin containing ethylene vinyl acetate (EVA) microspheres loaded with Ce(NO 3 ) 3 inhibitors, and was cured at a relatively high temperature to facilitate the fusion of adjacent microspheres for a strengthened self-healing effect. The electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) results demonstrated that the shape memory effect of epoxy matrix, the filling of molten EVA microspheres as well as the release of Ce(NO 3 ) 3 inhibitors contributed synergistically to suppress the corrosion reaction at the coating damage. After healing, the low frequency impedance modulus of the coatings containing Ce(NO 3 ) 3 -EVA microspheres was three orders of magnitude higher than that of the blank epoxy coating. The adhesion strength of the coatings containing Ce(NO 3 ) 3 -EVA microspheres on the metal substrate was also largely repaired thanks to the strong bonding effect of the EVA microspheres.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3547
·
IF 4.967
Naila Ishaque,Nauman Naseer,Muhammad Asad Abbas,Fatima Javed,Shehla Mushtaq,Nasir M. Ahmad,Muhammad Farhan Ali Khan,Naveed Ahmed,Abdelhamid Elaissari
In this research work, polymer blends of poly-lactic acid (PLA)/ethylene vinyl acetate (EVA) were prepared as the drug carrier materials for a bi-layer drug-loaded coating film for coronary stents. Different optimum compositions of blends were prepared by using an intense mixer. Then, the blends were hot-pressed and later cold-pressed to prepare for films of different thickness. The changes in weight, surface analysis and biodegradability with increasing time were studied using Scanning electron microscopy (SEM), weight loss and biodegradability tests. The mechanical and thermal properties of drug-loaded films were studied through universal testing machine (UTM) and thermo-gravimetric analysis (TGA). The effects of PLA, EVA and drug contents on in-vitro drug contents were investigated through the Ultraviolet-Visible Spectroscopy (UV-VIS) chemical analysis technique. The results obtained clearly showed that the addition of PLA promoted the unleashing of the drug whereas the addition of EVA nearly did not have the same affect. The mechanical properties of these various films can be tuned by adjusting the contents of blend parts. The factors affecting the unleashing of the drug became a serious matter of concern in evaluating the performance of bio-resorbable drug eluting stents. As a result, today’s chemical blends may be useful drug carrier materials for drug-loaded tube coatings capable delivering purgative drug in an incredibly tunable and regulated manner.Keywords:cardiovascular disease (CVD);biodegradable drug eluting stents;polymeric blends
研究领域:
医学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 14
·2028
·
IF 4.7
Chao Du,Yangyang Zhang,Jiangmin Lin,Guotao Fan,Can Zhou,Yan Yu
Polymeric positive temperature coefficient (PTC) materials with low switching temperature points are crucial for numerous electronic devices, which typically function within the room temperature range (0–40 °C). Ideal polymeric PTC materials for flexible electronic thermal control should possess a room-temperature switching temperature, low room-temperature resistivity, exceptional mechanical flexibility, and adaptive thermal control properties. In this study, a novel PTC material with a room-temperature switching temperature and superb mechanical properties has been designed. A blend of a semi-crystalline polymer EVA with a low melting temperature (Tm) and an amorphous polymer (PVAc) with a low glass transition temperature (Tg) was prepared. Low-cost graphite was chosen as the conductive filler, while CNF was incorporated as a hybrid filler to enhance the material’s heating stability. PVAc0.4/EVA0.6/GP-3wt.% CNF exhibited the lowest room temperature resistivity, and its PTC strength (1.1) was comparable to that without CNF addition, with a Curie temperature of 29.4 °C. Room temperature Joule heating tests revealed that PVAc0.4/EVA0.6/GP-3wt.% CNF achieved an equilibrium temperature of approximately 42 °C at 25 V, with a heating power of 3.04 W and a power density of 3.04 W/cm2. The Young’s modulus of PVAc0.4/EVA0.6/GP-3wt.% CNF was 9.24 MPa, and the toughness value was 1.68 MJ/m3, indicating that the elasticity and toughness of the composites were enhanced after mixing the fillers, and the mechanical properties of the composites were improved by blending graphite with CNF.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Yuhao Ma,Dingchen Yan,Juntao Xu,Jian Pan,Shanshan Xu,Hongsheng Tan
Polyethylene (PE) is widely used as a general-purpose plastic; however, its application in harsh environments is limited by poor resistance to thermal cycling crack resistance. In this study, a dual-modification strategy was developed to improve the thermal cycling crack resistance of PE by incorporating fibrous wollastonite (FW) and ethylene-vinyl acetate copolymer (EVA). FW acts as a rigid reinforcing phase that restricts polymer-chain mobility and helps suppress crack initiation. EVA serves as a flexible toughening phase and promotes energy dissipation during deformation. The combination of FW and EVA delays crack propagation and improves the crack resistance of PE. The combined use of FW and EVA produces a synergistic effect involving physical crack blocking and energy dissipation, thereby delaying crack propagation. Consequently, the modified PE demonstrates substantially enhanced resistance to thermal cycling cracking. The PE coating samples maintained structural integrity after cyclic exposure between −40°C and 60°C for 100 h. In addition, the tensile strength increased to 14.94 MPa, representing a 39% improvement compared with pristine PE (10.73 MPa). The combined FW-EVA system effectively improves PE's thermal cycling crack resistance, offering a feasible strategy for its high-demand applications.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 16
·12854-12865
·
IF 4.6
Qinghua Chen,Shiai Xu,Rujie Li,Beibei Sun,Huidong Fang,Qianqian Zhang
Magnesium hydroxide (MH) is widely recognized as an environmentally friendly, halogen-free flame retardant and has been extensively applied in ethylene-vinyl acetate (EVA) copolymers. However, its poor dispersion in the polymer matrix and low flame retardant efficiency remain significant challenges. In this study, hexagonal magnesium hydroxide (MHz) with well-defined morphology, high specific surface area, and excellent dispersion was inventively synthesized via hydrothermal synthesis using sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) as the hydrothermal medium. Three EVA composites filled with MHz and two different commercial magnesium hydroxides (MHx and MHy) were prepared via melt-blending, and their flame retardant and mechanical properties were systematically compared. The results indicate that the EVA composite containing 60 wt% MHz (EVA/MHz60) exhibits superior flame retardant performance, achieving a limiting oxygen index (LOI) of 49.2%, which is 53.8% and 9.1% higher than that of MHx and MHy, respectively. The UL-94 rating reached V-0. Furthermore, the peak heat release rate (PHRR) of EVA/MHz60 is significantly reduced to 150.6 kW m−2, marking a 33.2% and 29.9% reduction compared to the EVA composite containing 60 wt% MHx (EVA/MHx60) and EVA composite containing 60 wt% MHy (EVA/MHy60), respectively. Additionally, the tensile strength of EVA/MHz60 is improved by 101.6% and 76.4% compared to that of EVA/MHx60 and EVA/MHy60, respectively. The improvement in tensile strength of the EVA/MHz60 composite can be attributed to the nanoscale and uniform dispersion of MHz with hexagonal morphology, which can enhance the interfacial adhesion with the EVA matrix, thus the flame retardant and mechanical properties of the composite can be improved simultaneously.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 10
·2102069
·
IF 6.389
Haobin Wang,Yue Qiang,Shenshen Zheng,Peng Wei,Yahong Xie
Nanocrystalline tin (IV) oxide (SnO 2 ) as an electron-transport layer (ETL) has unique advantages in realizing highly efficient and stable planar perovskite solar cells (PSCs), especially showing great potential in the low-temperature preparation of large-area flexible carbon-based PSCs (C-PSCs). However, the high trap density on the surface of SnO 2 tends to cause serious nonradiative recombination losses, thereby reducing photoelectric performance. In this work, an inexpensive and easily obtained polymer poly(ethylene-co-vinyl acetate) (Eva) is used as a interfacial modifier to reduce the interfacial defects and nonradiative recombination losses at the SnO 2 /perovskite interface. As a result, the crystallinity and conductivity of the perovskite layer are significantly increased, and the charge lifetime and stability are effectively improved. The Eva modified SnO 2 -based C-PSCs obtain an optimal power conversion efficiency (PCE) of 12.29%, which is 25.7% higher than that of 9.78% for the unmodified C-PSCs. Furthermore, the unencapsulated devices maintain 88.6% and 91.9% of the initial PCE over 1 month in ambient air for the unmodified and Eva-modified C-PSCs, respectively. The study provides valuable experience for the development of highly efficient and stable C-PSCs using common polymers for interface modification engineering.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Suteng Qu,Jiahao Wu,Jiantao Xu,Peng Wang,Jian Song
Crystal silicon solar cells have long dominated the photovoltaic market, but their photoelectric conversion efficiencies are difficult to further improve. Although some studies have proposed to coat perovskite quantum dot downshifting film on surface of the device, there remains a lack of systematic research on the interaction between the quantum dots and their carriers. We selected three typical polymers in optical film, ethylene-vinyl acetate copolymer (EVA), polymethyl methacrylate copolymer (PMMA) and ethylene-methyl methacrylate copolymer (EMMA), and mixed them with perovskite quantum dots solutions to prepare composite films. Through component analysis, optical characterization, and theoretical calculations, we systematically explored the interaction between different polymers and perovskite quantum dots. Under protection of three composite downshifting films based on EVA, PMMA, and EMMA, the efficiencies of crystal silicon cells were increased by 0.49 %, 0.21 % and 0.81 %, respectively. As demonstrated by density functional theory calculations, it is the strong interaction between polymer chains and perovskite quantum dots make EMMA become the champion carrier for perovskite quantum dot. This study presents a promising perovskite quantum dot/polymer composite film characterized by low production costs and stable performance, demonstrating significant potential in the field of photovoltaics.
研究领域:
材料科学
·
光电子学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Caishi He,Zhipeng Liu,Jiadong Yang,Zhen Jia,Zebao Rui
In this work, the nano-silica particles grafted maleic anhydride (SiO 2 -g-MAH) was designed to enhance the compatibility of the ethylene-vinyl acetate copolymer/thermoplastic polyurethane (EVA/TPU) immiscible blend system. The silane side chains on SiO 2 -g-MAH can physically entangle with the molecular chains of both EVA and TPU, while the maleic anhydride groups on the surface of SiO 2 -g-MAH can react with TPU to form crosslinking structures. This enables SiO 2 -g-MAH to anchor at the interface, enhances interfacial adhesion and improves significantly the compatibility of the EVA/TPU blends. As a result, the dispersed phase size of the blends significantly decreases, meanwhile, their adhesive and mechanical properties get noticeably improved. When the addition amount of SiO 2 -g-MAH is 2 wt%, the size of the TPU dispersed phase decreases from the original 3.38 ± 0.59 μm to 0.69 ± 0.05 μm, and the lap shear strength and tensile strength of the blend reach respectively 8.76 MPa and 15.51 MPa, representing enhancements of 159.2 % and 45.1 % compared to the EVA/TPU blends without SiO 2 -g-MAH.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qingping Xin,Yucheng Pan,Chao Zhang,Lei Zhang,Chensheng Dong,Ligang Lin,Lizhi Zhao,Hui Ye,Yuzhong Zhang
The CH 4 /N 2 high-efficiency membrane separation technology is capable of effectively enriching CH 4 from natural gas, and holds great potential for application in the fields of biogas purification and natural gas pipeline leak detection. However, preparing high-performance separation membranes is challenging due to the similarity between CH 4 and N 2 molecules. To enhance the CH 4 /N 2 separation performance, block polyetheramide copolymer (Pebax)/EVA blended membranes were fabricated in this study. Additionally, a novel gas leakage detection tube was prepared. The EVA14 (14 wt% VA) membrane exhibits an optimal transport-facilitated channel among a series of pure EVA membranes, resulting in a CH 4 permeability of 21.41 Barrer and CH 4 /N 2 selectivity reaches 1.80 under mixed-gas feed conditions at 35 °C. The CH 4 permeability of Pebax/EVA (30 wt%) reaches 120.5 Barrer by physical blending, and the CH 4 permeability is increased by 191 % in comparison with pure EVA14 membrane. The Pebax/EVA (10 wt%) membrane exhibits the optimum CH 4 /N 2 selectivity, and compared with pure EVA membrane increased by 35.5 %. EVA and Pebax polymers are blended for the first time for CH 4 /N 2 separation, and the blending of block polyetheramide copolymer intensifies the membrane's separation performance comprehensively. The natural gas leak detection tube was fabricated with a membrane, offering a new and efficient CH 4 /N 2 separation strategy.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Zhongtian Li,Shuhong Jiang,Jieting Geng,Zhaoge Huang,Lin Xia
The development of advanced materials that combine multiple stimulus-responsiveness with sustainable credentials stands as a key frontier in modern polymer science. In this study, we report a novel multifunctional shape-memory foam prepared from renewable Eucommia ulmoides gum (EUG) and ethylene-vinyl acetate (EVA) using a facile one-step chemical foaming method. Moving beyond conventional single-function materials, this work achieves a synergistic structural design that simultaneously delivers outstanding thermal responsiveness, tailored surface activity, and efficient thermal insulation. At the optimal EUG/EVA ratio (70/30), the foam exhibits remarkable temperature-responsive shape-memory performance, with shape-fixity and shape-recovery ratios exceeding 98% and 91%, respectively. The surface is designed to be strongly hydrophobic, reaching a water contact angle of 147.1°, which enables highly selective and efficient absorption of oils and organic solvents, with uptake capacities surpassing 15 g/g. Moreover, the well-defined closed-cell morphology imparts excellent thermal insulation, yielding a low thermal conductivity of 0.049 W m −1 K −1 . This pioneering integration of intelligent shape memory, superior hydrophobic/oleophilic selectivity, and effective thermal insulation into a single eco-friendly platform paves the way for next-generation smart materials toward applications in environmental remediation, adaptive packaging, and thermal management.
✓ 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）