Polymers
·
2021
·Vol. 13
·期 9
·1406
·
IF 4.329
Daoyuan Chen,Mingjin Ding,Zhixiong Huang,Yanbing Wang
In order to study the dynamic mechanical properties of styrene–acrylic latex with a core/shell structure, a variety of latexes were synthesized by semi-continuous seeded emulsion polymerization based on “particle design” with the same material. The latexes were characterized by rotary viscosimeter, dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), dynamic mechanical analysis (DMA), and universal testing machine. The effects of difference at the glass transition temperature (Tg) of core and shell and the introduction of the “transition layer” on the damping and mechanical properties of latex film were studied. The results indicate that as theTgof core and shell gets closer, the better the compatibility of core and shell, from phase separation to phase continuity. Furthermore, the introduction of the “transition layer” can effectively improve the tensile strength and tan δ (max) of the latex film. The tensile strength and maximum loss factor (f = 1 Hz) of latex with the “transition layer” increased by 36.73% and 29.11% respectively compared with the latex without the “transition layer”. This work provides a reference for the design of emulsion for damping coating.Keywords:styrene–acrylic;damping;core/shell;transition layer
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·
IF 12.1
Shaojie Mo,Ang Xu,Mo Li,Zhongyang Zheng,Youwei Yan,Xinyun Wang,Heping Li
Hydrogen embrittlement in metals seriously threatens the safe and durable operation of hydrogen energy. Developing efficient and robust hydrogen barriers is a viable solution to solve this issue but remains a significant challenge. An amorphous (ErAlCrZrTi)O high-entropy nanofilm is successfully fabricated via sol-gel on steel and identified as highly efficient and robust hydrogen barrier. At 270 nm thickness, the nanofilm achieves ultra-low hydrogen permeability of 1.35 × 10 −15 mol m −1 s −1 Pa −0.5 , enhancing hydrogen resistance by 2738 times at 500 °C compared with that of bare steel. Compared to Er 2 O 3 , Al 2 O 3 , Cr 2 O 3 , and ZrO 2 , it improves hydrogen resistance by 5, 11, 26, and 90 times, respectively. Moreover, such a high hydrogen resistance can be satisfyingly retained even after the (ErAlCrZrTi)O nanofilm suffering 10 dpa irradiation. The nanofilm exhibits 37 MPa bonding strength and exceptional thermal shock resistance, attributed to the formation of Cr₂O₃ transition layer via precipitation and oxidation of Cr from the substrate during annealing. It strengthens adhesion and alleviates thermal expansion mismatch with the substrate. The mechanism for the high barrier efficiency is further revealed by this theoretical calculations. These results provide tremendous insights on the understanding and future design of high-performance hydrogen barriers for hydrogen embrittlement prevention.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Fan Xiao,Ming Cao,Yingbo Chen
The synthesis of ultra-thin, uniform and continuous polyamide (PA) membranes is a crucial prerequisite for enhancing their desalination performance. Research has indicated that effectively slowing down the interfacial polymerization (IP) reaction and promoting the interface stability are key strategies for achieving ultra-thin, uniformly nano-structured membranes with excellent performance. Herein, we have demonstrated the successful design of a continuous and uniform PA membrane, ranging from 10 to 20 nm, by utilizing the UiO-66-(OH) 2 n-hexane dispersion as a transition layer to regulate IP reaction and enable efficient water-salt separation. The results showed that the presence of the transition layer facilitated a bidirectional diffusion-contact reaction between the two monomers, resulting in improved interface stability and alleviating the occurrence of severe IP that may lead to heterogeneous membrane structures. As a result, the PA active layers formed through this approach exhibited superior thinness and uniformity compared to those produced via traditional IP methods. Moreover, the transition layer enabled uniform pre-polymerization of UiO-66-(OH) 2 at the reaction interface by pre-exposing it to down-diffusing acyl chloride monomers. This ensured the continuity of membrane structure while creating additional free volume within the membrane. This work presented a scalable method for manufacturing ultra-thin, defect-free, homogeneous, and high-performance nanofiltration membranes.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2024
·
IF 6.1
Tao Liu,Chang Jiang,Zekai Liu,Xuehui Zhang,Wenmin Zhao,Longfei Zeng,Lina Zhang
Reduced graphene oxide (rGO) with surface-loaded Cu particles (scCu-rGO) was prepared by supercritical CO 2 deposition, and Cu matrix composites with scCu-rGO as a reinforcement (scCu-rGO/Cu composites) were successfully prepared by ball milling for different times and spark plasma sintering (SPS). The scCu-rGO/Cu composites prepared with a ball milling time of 20 h exhibited high electrical conductivity (96.3 % IACS), tensile strength (240 MPa), and elongation (37 %). The outstanding properties are mainly ascribed to the uniform distribution of rGO by the ball milling process and rGO promoted by loading Cu particles onto its surface through supercritical deposition, which led to an interfacial reaction between rGO and Cu, resulting in the formation of a Cu 2 O transition layer with a load-transferring effect that enhanced the mechanical properties of the composites. Based on the experimental results, the strength of scCu-rGO/Cu composites is mainly enhanced by synergistic strengthening through grain refinement, Orowan looping and load transfer strengthening. This study demonstrates that the use of supercritical deposition to construct Cu 2 O transition layers can result in a strength-plasticity and high electrical conductivity match in scCu-rGO/Cu composites. The findings presented here offer new insights for innovative design of Cu matrix composites for advanced engineering applications by using supercritical deposition.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tianguang Wang,Jinsong Zeng,Pengfei Li,Fugang Hu,Hao Yang,Jianqiao Su,Daxian Cao,Kefu Chen
Responsive ionic hydrogels with switchable stiffness exhibit broad potential for practical applications. However, the presence of hydration layers presents significant challenges in optimizing the performance of these materials. In this manuscript, we report a strategy for converting the hydration layer of ionic hydrogels into a transitional layer. This enables isochoric and reversible switching between soft ionic hydrogels and rigid polymers by adjusting phase separation, accompanied by a gigantic stiffness change from approximately 0.36 MPa to 694.90 MPa. By analyzing these mechanical responses during continuous phase separation, we identified a three-stage evolution pattern: transitioning from a soft state to a tough state, and ultimately to a robust state. Meanwhile, research has demonstrated that the presence of a transition layer not only ensures uniform stress distribution and defect-free structures in ionic hydrogels at low stiffness levels but also significantly enhances the dimensional stability, mechanical integrity, and fatigue resistance of the polymer network during stiffness-switching. This ultimately facilitates the successful fabrication of polymer materials with a broad range of tunable stiffness and enhanced toughness. This work presents a novel strategy for integrating transitional layers into ionic hydrogels, underscoring their potential for applications requiring isochoric and a broad range of adjustable stiffnesses.
研究领域:
材料科学
·
高分子化学
·
力学性能研究
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2017
·Vol. 295
·期 2
·353-362
·
IF 1.723
Bai Long,Huan Siqi,Zhang Xiao,Jia Zhao,Gu Jiyou,Li Zhiguo
The synthesis of structured latex particles containing hydrophilic poly(vinyl acetate) (PVAc) cores and hydrophobic poly(styrene) (PS) shells mediated by a controllable transition layer was reported. A transition layer was fabricated onto PVAc cores by introducing a coupling monomer and butyl acrylate (BA), prior to polymerization of second-stage St-based monomer mixture. While such structured PVAc/PS latex particle obtained was thermodynamic non-equilibrium, straightforward synthetic route of the transition layer can be optimized so that the particle morphology is kinetically achievable. Analysis by transmission electron microscopy shows that the particle morphology is highly influenced by both the transition layer composition and PS-based polymer composition. Two-phase particle morphology without transition layer was an inverted acorn-like structure with single PS core wrapped by PVAc shells. The particle morphology mediated by transition layer varied from that of a broken egg shell-like structure with PS-based coating, over intermediate structures in which uniform PS protuberances surrounded PVAc cores, to core/shell structure with single PVAc core. This general approach may offer a number of possibilities for design and synthesis of kinetically controllable phase-separation morphologies for a variety of 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
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xiaohui Ju,Jin-Peng Lu,Liu-Lin Zhao,Tian-Dan Lu,Xue-Li Cao,Tian-Zhi Jia,Yi-Chen Wang,Shi-Peng Sun
Electrospun nanofibers with completely interconnected pore structures are increasingly considered as substrates for fabricating thin-film nanofibrous composite (TFNC) nanofiltration (NF) membranes. The poor adhesion between the large-pore substrate and dense selective layer has been considered as the bottleneck for wide application. This work presents the role of a transition layer on membrane structure as well as performance enhancement. Specifically, both polyethyleneimine (PEI)/polyacrylonitrile (PAN) transition layer and PAN substrate layer are formed by electrospinning. Interfacial polymerization (IP) is subsequently performed with trimesoyl chloride and piperazine. The introduction of the PEI modified transition layer improves the hydrophilicity, provides additional reaction sites for IP, and avoids the polymerization in the pores of nanofibers. The resultant composite NF membranes exhibit a compact and defect-free selective layer. Such an optimal structure leads to an excellent separation performance of 95.6% for orange ΙΙ dye (MW = 350.32 g/mol) rejection and 38.5 L m −2 h −1 bar -1 for the pure water permeability. It exhibits stable long-term performance during low pressure (0.2 MPa) nanofiltration, which will afford significant directions for the actual application of the TFNC membranes in water purification and other fields.
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
MATERIALS & DESIGN
·
2017
·
IF 4.364
Zhijun Feng,Xufeng Wang,Juntong Huang,Xibao Li,Jinshan Lu
The application of a porous silica (PS) transition layer in an inorganic-organic aeronautic laminated glass can effectively solve the material failure caused by the performance difference of the inorganic-organic materials. The effect of porous silica transition layer thickness on the mechanical and optical properties of laminated glass was investigated. The microstructure of the porous silica transition layer was analyzed by scanning electron microscopy. The film thickness was verified using a step profiler. The failure strength of laminated glass with the porous silica transition layer was tested by a universal testing machine. Finite element modeling of laminated glass with the porous silica transition layer was performed by ANSYS software. Tensile stress between the porous silica and the polyurethane was simulated for different porous silica film thicknesses. Experimental and theoretical results indicated that with the increasing the thickness of the transition film, the failure stress of the laminated glass increased. Improvements in the mechanical properties of the laminated glass are saturation at a PS thickness of approximately 3.8 μm.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mingcheng Feng,Qingyun Fu,Jian Li,Jingyao Li,Qiong Wang,Xiangning Liu,Weihong Jin,Wei Li,Paul K. Chu,Zhentao Yu
Fast degradation of magnesium (Mg) and its alloys in the physiological environment has impeded their clinical use as temporary implants. To control degradation of Mg in the physiological environment, a sodium alginate coating is fabricated on alkalinized high-purity Mg with a silane transition layer by spin coating . The surface morphology and composition are investigated by scanning electron microscopy, energy-dispersive X-ray spectrometry , X-ray diffraction, and Fourier transform infrared spectroscopy . Electrochemical and immersion tests are performed in the simulated body fluid (SBF) at 37 °C. The composite coating with a thickness of 10.3 µm is uniform and adheres well to the Mg substrate. Compared to the bare substrate, the corrosion current density of the sample with the composite coating decreases from 130.9 ± 6.2–1.3 ± 0.3 μA cm −2 and the charge transfer resistance increases by 190 times. The average degradation rate in SBF drops to 0.80 ± 0.26 mm year −1 from 3.47 ± 0.25 mm year −1 of the pristine Mg substrate and the composite coating is demonstrated to impede corrosion of the Mg substrate after immersion in SBF for 14 days. The excellent protection rendered by the composite coating is ascribed to the effective barrier effects of the dense and adhering sodium alginate coating and blocking effect of chelate compounds of sodium alginate and Mg ions formed during the corrosion process.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiebo Hu,Ping Xu,Mingdong Liao,Xiuqing Lu,Guobo Shen,Chenghao Zhong,Mingyu Zhang,Qizhong Huang,Zhean Su
Poor intrinsic conductivity and significant volume expansion inhibit the application of SiO which shows high specific capacity in LIBs . In this study, we successfully prepared a SiC transition layer in the middle of SiO@C anode material to reduce its volume swelling by the direct infiltration and pyrolysis of polymethysilane. The results demonstrated that the introduction of the SiC transition layer effectively improved the electrochemical behavior of the SiO anode. The SiO@SiC@C composite showed a high initial coulombic efficiency of 78.99% and a reversible capacity of 1148.7 mAh g −1 after 200 cycles at 0.5 A g −1 , which displayed an extreme capacity retention of 91% compared to second discharge capacity (1263.5 mAh g −1 ). Moreover, the SiO@SiC@C exhibited superior rate capability of an average capacity recovery rate of 97% when the rate cycle recovered from 3 A g −1 to 0.1 A g −1 . It also displayed outstanding long-term cycling stability, retaining 78% of its discharge capacity of 483.3 mAh g −1 after 1000 cycles compared to the 7th cycle even at 3 A g −1 . In conclusion, the incorporation of the SiC transition layer for SiO electrodes exhibited considerable potential for developing high-performance anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Qixiong Zhang,Yafei Hou,Qi Yang,Jing Cuan,Weiping Li
High energy storage in multilayer composites is pivotal for the progress of advanced electronic and power device systems, however, the uneven distribution of electric fields caused by significant dielectric contrast between adjacent layers limits its potential gaining in energy density. Through incorporating transition layers into multilayer composites to mitigate interlayer dielectric contrast, herein, four-layer matrix gradient-structured composites ( x vol% PMMA/(100- x ) vol% P(VDF-HFP) have been designed and fabricated. The results demonstrate that the transition layers play a crucial role in hindering the breakdown process and homogenizing the electric field distribution. In addition, the linear PMMA as well as horizontally oriented nanoplates are also beneficial in enhancing their energy storage performances. The gradient-structured composite ultimately achieved an energy density of 24.3 J/cm³ and a charge-discharge efficiency of 86.6 % at 676.8 MV/m, significantly surpassing that of traditional multilayer nanocomposites. The strategies proposed here may represent a universal approach to further enhance energy storage performances of multilayer composites.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinke Zhou,Shengkai Liu,Amna Siddique,Chunying Min,Xiaoyuan Pei,Siqi Liu,Yue Yin,Kun Song,Zhiwei Xu
Carbon fiber/epoxy resin composites are susceptible to stress concentration at the interface due to significant differences in the physical and chemical properties of the fibers and resin, resulting in severe degradation of the composite properties. In this paper, the construction of an interfacial transition layer with controllable thickness was achieved for the first time by in situ growth of amino-functionalized metal–organic framework materials with different particle sizes on the surface of carbon fibers and the stress concentration mitigation effect of the modified composites was investigated. Nanoindentation tests showed that interfacial transition layers with thicknesses of 500, 800, 1100 and 1600 nm were successfully constructed. The maximum improvement in interfacial shear, interlaminar shear and flexural properties of the modified composites were 115.0 %, 18.7 % and 26.7 % respectively, compared to the pure carbon fiber composites. Finite element simulations indicated that the stress concentration of the composites decreased by 16.7 %, 33.3 %, 58.3 % and 66.7 % with increasing the thickness of the interfacial transition layer respectively. The electron micrographs after failure showed that the failure mode of the composites changed from interfacial debonding to cohesive failure (fiber and matrix fracture), and the failure plane moved slightly from the interface to the inside of the epoxy resin, which indicated that the introduction of the interfacial transition layer improved the stress transfer between the fibers and the matrix, thus improving the mechanical properties of the composites. This finding enriched the theory of interfacial design for composites and contributed to the breakthrough improvement of their mechanical properties.
研究领域:
材料科学
·
力学
✓ 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）