JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 10
·5788-5804
·
IF 4.682
Niu Hao,Yang Dan-Lei,Pu Yuan,Wang Dan,Wang Jie-Xin
Nanocomposites have been used in various industries due to their excellent properties. For some of them, high filler content (over 50 wt%) is beneficial to improving their performances. This study aims to explore the network model construction and properties of high filler content dental resin composites (DRCs). An improved multistep dynamic cross-linking procedure was proposed and firstly applied to construct the reasonable molecular model of high filler content DRCs. The predicted elastic modulus and stress–strain results of DRCs with different nanofiller contents show that the DRCs with a 70 wt% filler content have the most excellent mechanical properties. Furthermore, the dynamic property study indicates that the diffusion coefficient of matrices firstly decreased and then increased with the nanofiller content increasing from 0 to 80 wt%, reaching the lowest value at 70 wt%. The migration of resin matrices can be limited by nanofillers at the content within 70 wt%. However, when the filler content is excessively high (80 wt%), the stability of matrices is destroyed and the fractional free volume of DRCs sharply increases, resulting in a decrease of mechanical properties of DRCs. The findings of this study deepen the understanding of structures and properties of DRCs at the atomic/molecular scales. Graphical Abstract
研究领域:
材料科学
·
牙医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kang Chen,Ruixia Liu,Ce Sun,Dingyuan Zheng,Yuanyuan Miao,Yingfeng Zuo,Haiyan Tan,Yanhua Zhang
Polylactic acid (PLA), a green and sustainable polymer, has shown promise as an alternative to conventional plastics, yet its practical utilization remains constrained by inherent brittleness and poor ductility. Here, we report flexible and twistable PLA composites engineered through the incorporation of tailored bio-based copolymer filler. At filler loadings of only 10 wt%, the composites achieve a tensile elongation at break of 159.60 % and a toughness of 52.40 kJ/m 3 , representing 14-fold and 13.3-fold enhancements over pristine PLA, respectively. Notably, the tensile strength remains high at 52.19 MPa, demonstrating an exceptional balance between strength and toughness. Mechanistic studies reveal favorable interfacial compatibility between the filler and PLA matrix, with energy dissipation occurring via synergistic mechanisms including matrix cavitation, crazing, and shear yielding. The composites exhibit remarkable room-temperature deformability, sustaining extensive bending and torsional strains. These findings advance the development of robust yet adaptable bioplastics, offering new opportunities for eco-friendly electronic devices and sustainable packaging materials.
研究领域:
材料科学
·
高分子科学
·
生物复合材料
·
力学性能
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiang Li,Chuang Huang,Zilong Wang,Zhen Xiang,Wei Lu
Metal-organic frameworks (MOFs) derived carbon-based magnetic metal materials had attracted much attention in the field of electromagnetic wave absorbers. In this work, a layered FeCo@C nanocomposites was successfully synthesized by annealing FeCo-MOFs. The pyrolytic temperatures had influenced the graphitization degree of the carbon frameworks and the magnetic properties of the FeCo nanoparticles . Owing to the outstanding attenuation capacity, impedance matching and unique layered structure, FeCo@C nanocomposites displayed an excellent electromagnetic wave absorption performance with the strongest reflection loss ( RL ) value could reach to −53.6 dB at 12.8 GHz and the effective bandwidth ( RL <−10 dB) could reach 6 GHz (10.4–16.4 GHz) at the thickness of 2.5 mm with the filler loading was only 15 wt%. Therefore, the layered FeCo@C nanocomposites could be a potential high-efficiency electromagnetic wave absorption material with lightweight, wide effective absorption bandwidth, and strong absorption characteristics.
研究领域:
材料科学
·
纳米科技
·
电磁学
·
功能材料
·
复合材料工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Jin Hu,Lu liu,Shufen Zhang,Bingtao Tang
Dielectric polymer nanocomposites have been extensively studied to achieve high-energy-density capacitors. However, their energy density ( U d ) usually improves at the expense of transparence, light weight, and processibility of polymer matrices because of high nanofiller loadings. Herein, polydopamine-modified titanoniobate nanosheets (TNO@PDA_nss) were prepared as fillers. Their high relative permittivity ( ε r ) contributes to increasing ε r . Their large aspect ratio facilitates to improve the mechanical properties and distort the electrical treeing paths. Moreover, they are negatively charged and can electrostatically block energetic electrons. Thus, ε r and breakdown strength of the polymer nanocomposites simultaneously enhance at ultralow filler loadings, leading to significantly enhanced U d . The 0.2 wt% TNO@PDA_nss/PVDF/PMMA nanocomposites exhibit a maximum U d of 11.5 J/cm 3 , which is 2.1 and 1.5 times that of pristine PVDF and PVDF/PMMA blend, respectively. This work presents a facile strategy that hardly compromises the advantages of polymer matrices to obtain high- U d polymer nanocomposites at ultralow filler loadings.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiangang Chen,Meixia Cai,Ying Liu,Panpan Yang,Jiping Wang
This paper develops a novel adhesive for in-situ joining C/C composites to C/C-SiC composites using a phenolic resin modified with inert fillers (SiC and graphite powders). The primary phase of the reaction bonding joint layer is SiC, which matches the thermal expansion coefficient of the matrix better than metallic phases, making it an improvement over traditional brazing. The effect of filler content on joint strength, oxidation resistance, and thermal shock resistance has been systematically investigated. The results show that increasing the filler content from 0 to 50 wt% increases shear strength up to a maximum of 25.97 MPa at 15 wt% SiC and 15 wt% graphite powder. The oxidation and thermal shock tests reveal that the joints exhibit a decrease in shear strength due to oxidation at temperatures above 600 °C, with a significant reduction occurring between 600 °C and 700 °C. After seven thermal shock cycles at 800 °C, the shear strength of the joints remains relatively high, indicating the good thermal shock resistance of the bonding layer. The method proposed in this study provides a new approach for controlling residual silicon and enhancing the properties of C/C-SiC joints.
研究领域:
材料科学
·
复合材料
·
连接技术
·
热分析
·
陶瓷基复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RHEOLOGY
·
2023
·Vol. 67
·期 1
·157-157
·
IF 3.3
Hu Zhaopeng,Zhou Junwei,Song Yihu,Zheng Qiang,Wang Wanjie
Engineered rubber vulcanizates may contain a low content of short fibers and a high content of nanoparticles while the effects of the different fillers on the softening behavior are not yet explored. Herein, influences of carbon black (CB) and short aramid fiber (AF) on the Payne and Mullins effects of natural rubber composites are investigated for the first time by creating master curves of dynamic modulus or dissipation energy with respect to the straining responses of the matrix. It is revealed that the composite vulcanizates demonstrate the Payne effect characterized by decay of storage modulus, weak overshoot of loss modulus, and very weak high-order harmonics; this effect is mainly dominated by the rubber matrix experiencing microscopic strain amplitude enlarged by the filler. The composite vulcanizates exhibit the Mullins effect that becomes increasingly marked with increasing filler loading and is partially recovered by thermal annealing at relatively high temperatures. The energy dissipation during cyclic tensions is rooted in the viscoelastic deformation of the matrix and the filler-rubber interfacial debonding. The former is marked at room temperature where the rubber phase undergoes a crystallization-melting process during loading-unloading. The latter being marked in the presence of a small content of AF causes yieldinglike deformation for the virgin composites at low tensile strains, and its contribution to the softening is not recoverable during thermal annealing. The results show that the viscoelastic matrix is of importance in controlling the softening of the composite vulcanizates, which will be of guiding significance to conduct research studies on high-performance rubber composites products.
研究领域:
材料科学
·
高分子科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 14
·831
·
IF 2.8
Zhao Tianqun,Zeng Tianrui,Jin Shilei,Li Xiaohui,Yu Zhiqiang
BNT (BaO–Nd 2 O 3 –TiO 2 ) system was modified via doping using sol–gel method, and BNST-Mn/PTFE microwave dielectric composite was prepared by mechanical blending. Scanning electron microscopy (SEM), thermal dilatometer, and split post-dielectric resonator (SPDR) were used to characterize the microstructure, dielectric properties, and thermal properties of the composite materials. The results indicate that as the amount of ceramic filler supplied grows, the agglomeration of fillers becomes more pronounced. At a filler content of 10 wt%, the dispersion of the filler in the matrix resin is relatively uniform. The dielectric constant and dielectric loss of the composites increased, and the bonding ability between the two phases diminished with the increase in filler content. When the mass fraction of the ceramic was increased to 70 wt%, the dielectric constant of the composite was 10.92 and the Q·f value was measured at 3584 GHz. At the same time, the coefficient of thermal expansion (CTE) of the composites reached 23 ppm/°C, which was a good compatibility with the copper foil. Lichtenecker equation, Maxwell–Wagner equation, Jayasundere–Smith equation, and effective medium theory equation (EMT) were used to predict the dielectric constant of the composites. In comparison, the dielectric constant values calculated using the EMT equation were in good agreement with the experimental values, especially at low filling volumes. Also, the simulation results of the thermal expansion coefficient of composite materials using the Lichtenecker equation and its improved form are in good agreement with the experimental values.
研究领域:
材料科学
·
陶瓷与复合材料
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介电材料
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微波技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2021
·
IF 3.189
Weiwei Zhang,Jiahao Liu,Luobin Zhang,Jianqiang Wang,Zheng Zhang,Jintao Wang,Hao Liu,Hongtao Chen,Mingyu Li
In the application of electronic products, it is critical for conductive adhesives to ensure high electrical conductivity and good adhesion reliability. In this study, isotropic conductive adhesives (ICAs) with high conductivity and low percolation threshold can be achieved by making full use of the synergistic effect of micron spherical and flaky silver-coated copper (Cu@Ag) conductive fillers . The flaky Cu@Ag powder prepared by electroless plating was chosen as the main conductive filler, and the spherical core-shell structure Cu@Ag powder was used as an auxiliary conductive filler to be dispersed in the flaky Cu@Ag particles, providing more possibilities for building a large number of conductive bridges. In this study, the Cu@Ag powder was synthesized to eliminate the disadvantages of Cu oxidation and Ag electrochemical migration, while making the ICAs low cost and favourable conductivity. Furthermore, the curing parameters were optimized for the matrix resin in corresponding experiments. The results showed that a combination of spherical and flaky Cu@Ag powders in ICAs could not only significantly reduce the percolation threshold and the bulk resistivity but also increase the shear strength compared with the single component. In particular, the bulk resistivity of the optimum sample was 1.95 × 10 −3 Ω cm, and the shear strength was 22.69 MPa when the filler content was only 60 wt%. Hence, the ICAs filled with spherical and flaky Cu@Ag will pave the way for high-performance and low-cost ICAs in the electronics packaging industry.
研究领域:
材料科学
·
电气工程
·
化工
·
电子封装
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Ling Li,Xiaojuan Zhang,Bianying Wen
A highly efficient electromagnetic wave-absorbing material with a low filler amount is urgently pursued to suppress unwanted electromagnetic radiation issues. To exploit this kind of absorber, constructing a one-dimensional (1D) structure holds exceptionally great importance. Herein, 1D polypyrrole (PPy) nanochains with different conductivities have been successfully synthesized through the combined utilization of chemical oxidative polymerization and a soft template method. When the mass ratio of PPy nanochains is regulated in a flexible thermoplastic polyurethane (TPU) matrix, PPy-1/TPU composites emerge with superior wave attenuation capacity with an optimal reflection loss of −50.4 dB at 2.55 mm and an effective absorption bandwidth of 3.76 GHz at 2.62 mm when the filler loading is only 7 wt %. The potential dissipating mechanism is mainly attributed to the enhanced synergistic effects of a unique 1D chain structure, conduction loss, and dielectric loss. This work paves a promising pathway for fabricating an excellent wave-absorbing candidate with low filler content by employing a single absorbent.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Xinke Zhong,Yihu Song,Qiang Zheng
Rubber nanocomposites exhibit strain softening under large-amplitude oscillation shear and large-strain cyclic tension while the mechanisms remain unresolved. Herein we systematically investigate the Payne effect and Mullins effect of unfilled and silica filled butadiene rubber (BR) vulcanizates to clarify the impacts of crosslinking density, sol fractions, and filler content. During large-amplitude oscillation shear, the critical strain amplitude for the onset of Payne effect is closely related to storage modulus in the linear viscoelastic region. During cyclic tension deformations, the recovery hysteresis energy and accumulating softening energy are involved in the local deformation of the rubber matrix, which is promoted by the filler phase. These findings are illuminative for optimizing performance of rubber nanocomposite products by controlling the nonideal network structure of viscoelastic rubber matrix.
研究领域:
材料科学
·
高分子科学
·
机械工程
✓ 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）