INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zhen Zhang,Shanlin Cui,Ruixue Ma,Qiuyang Ye,Jiahui Sun,Yaming Wang,Chuntai Liu,Zhen Wang
High-toughness biodegradable poly(lactic acid) (PLA) has always been intensively pursued on the way of replacing traditional petroleum-based plastics. Regulating microstructures to achieve self-toughening holds great promise due to avoidance of incorporating other heterogeneous components. Herein, we propose a straightforward and effective way to tailor microstructures and properties of PLA through melt-stretching and quenching of slightly crosslinked samples. The melt stretching drives chains orientation and crystallization at high temperature, while the quenching followed can freeze the crystallization process to any stage. For the first time, we prepare a type of transparent and low-crystalline PLA filled with rod-like β-form shish, which displays an outstanding tensile toughness, almost 17 times that of the conventional technique-processed one. This mechanical superiority is enabled by an integration of high ductility due to oriented chain network, and high tensile stress endowed by nanofibrous filler's role of β-form shish. Furthermore, the mechanically toughened PLA is demonstrated to generate the richest micro-cracks and shear bands under loading, which can effectively dissipate the deformational energy and underlie the high toughness. This work opens a new prospect for the bottom-up design of high-performance bio-based PLA materials that are tough, ductile and transparent by precise microstructural regulation through scalable melt processing route.
研究领域:
材料科学
·
生物降解材料
·
高分子物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Xuebing Li
Phase change materials (PCMs) are increasingly popularized in the field of passive thermal management. However, several inherent defects such as strong rigidity, weak hydrophobicity and poor thermal conductivity have seriously hindered their widespread development. This work introduces a novel composite PCM with thermally-induced flexibility as well as enhanced hydrophobic and thermally conductive abilities, which is synthetized by physical melting and mixing of palmitic acid (PA), olefin block copolymer (OBC) and hexagonal boron nitride (h-BN). Experimental results demonstrate that OBC helps to realize flexibility and hydrophobicity, while h-BN is essential to spurring thermal conductivity growth but incapable of impairing surface wettability . 66.5 wt% PA, 28.5 wt% OBC and 5 wt% h-BN are convinced to be the appropriate formula of composite for the hydrophobic modification and the weighing between thermal conductivity and thermal storage capacity. The as-prepared flexible PCM reverses its surface wettability from hydrophilicity to hydrophobicity, accompanied by 27.0 % increment in water contact angle compared with the case of using only PA. The resultant also presents fine physiochemical compatibility, suitable phase transition parameters, and excellent thermal stability and reliability. Furthermore, highly reliable hydrophobicity is confirmed under four harsh conditions for prolonged application.
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
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Haolang Liu,Shuiquan Li,Meichen Wang,Huihui Liu,Jin Jiang,Shuyang Shao,Zhi Wang
Polybenzoxazine has been explored in coating applications because of its excellent properties, including good processability, excellent thermal stability, and large water contact angles, but its toughness must be improved without compromising its other properties. Herein, a new serious of polyurethanes with varying numbers of ether groups were synthesized to enhance the toughness of polybenzoxazine via tuning the hydrogen bonds . The curing mechanism, chemical structures , and phase morphology of the blends are discussed. The results show that hydrogen bonding is the main reason for improved properties of the cured products. By varying the hydrogen bond content of the modified system, a champion toughness of 20.4 kJ/m 2 without sacrificing processability, thermal stability, and coating performances can be realized, which the char yield is varied between 26.0 % and 28.9 % at 800 °C and corresponding coating hardness and adhesion can reach to 6H and 5B, respectively. Furthermore, the modified system-based coatings exhibit a reversible hydrophobic-hydrophilic state by different stimulus with a champion oil-water separation efficiency of 3379 L·m −2 ·h −1 , illustrating their potential intelligent 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
ChemistrySelect
·
2023
·Vol. 8
·期 47
·e202303036
·
IF 2.1
Nan Liu,Binglian Zhu,Rutong Zhang,Weiqiao Zhong,Qibin Chen
Graphical NH 2 -silica-C 8 H 17 nanosheets containing short n-octyl chains and aminopropyl groups were investigated as a novel toughening agent for enhancing the toughness and strength of epoxy resin. The incorporation of 0.5 wt.% Janus nanosheets led to remarkable enhancements in the mechanical, dynamic mechanical, and thermal properties of the epoxy resin, as evidenced by the characterization results. In this work, a NH 2 -silica-C 8 H 17 Janus nanosheet with short n -octyl chains on one side and aminopropyl groups on the opposite side was prepared by the sol-gel method. This nanosheet was used to improve the toughness and strength of epoxy resin. The morphologies and structures of Janus nanosheets and the properties of NH 2 -silica-C 8 H 17 /epoxy nanocomposites were characterized. Results show that the addition of Janus nanosheets not only increases the storage modulus and glass transition temperature of nanocomposites, but also improves their mechanical performance and thermal stability. The tensile strength, elongation at break, fracture toughness and impact strength of nanocomposites are increased by ca. 57, 80, 74 and 63 %, respectively, at the 0.5 wt.% loading of Janus nanosheets. These findings suggest that NH 2 -silica-C 8 H 17 Janus nanosheets exert an effective influence on the toughness and strength of ultimate nanocomposites, which is attributed to the fact that NH 2 -silica-C 8 H 17 Janus nanosheet simultaneously contains n -octyl and aminopropyl groups on both sides, thus improving the nanosheet/matrix interface adhesion.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Kun Zhang,Yigang Wang,Yuwei Chen,Wenbin Li,Qianyong Chang,Zhouyu He,Yu Zhu,Jinrui Huang,Xiaoan Nie
The development of plant oil-based modifiers that significantly improve the toughness of diglycidyl ether of bisphenol A (DGEBA) while exerting minimal adverse effects on their strength and modulus poses a critical challenge. Biological materials such as nacre , bones , spider silk, and tendons are characterized by the presence of sacrificial bonds, which contribute significantly to their exceptional strength and remarkable toughness. In this study, a tung oil-based epoxy terminated polyurethane (TETPU) was synthesized, drawing inspiration from biological materials. The significant enhancement in toughness was achieved while preserving exceptional mechanical strength by integrating sacrificial bonds through the formation of hydrogen bonds and π-π interactions within the epoxy resin network. The incorporation of 30 wt% TETPU resulted in a 111.7% increase in elongation at break, a 40.29% increase in toughness, and a 90.59% increase in impact strength compared to the neat DGEBA. Additionally, the tensile and flexural strength underwent a decrease of 16.36% and 18.80%, respectively. The exceptional performance can be attributed to the formation of multiple sacrificial bonds between TETPU and epoxy network. The study presents a direct and effective approach for producing plant oil-based epoxy modifiers, resulting in a substantial enhancement in toughness with minimal effects on strength and modulus.
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
MATERIALS SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.8
Hong Zeng,Wenbin Liu,Feitong Han,Chongbin Wei
Here, the effects of Ru and ball-milling on the mechanical properties of WC–10Co-cemented carbide were investigated using systematic characterisation and microstructure analysis. It was found that with an increase in the Ru content, the WC grain morphology and grain size did not change; however, the values of density and coercivity, Co magnetism, hardness, and fracture toughness of cemented carbide were changed. When the Ru content was 4%, compared with the alloy without Ru, the toughness increased from 16.8 to 24.2 (MPa. m1/2) and the hardness increased from 1290 to 1330 (HV30). Meanwhile, the analysis of the mixing process shows that the optimal ball-milling time is determined by the performance combination of the obtained alloy.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Shi Chengyu,Li Nan,Yuan Qisong,Liu Tao,Cao Qingyuan,Qian Hanqi,Jiang Bo,Wang Jiazhi,Yu Xiangtao
Developing epoxy structural adhesives with excellent high-temperature adhesion remains a great challenge. The incorporation of fillers can enhance the performance of epoxy adhesives, albeit at the expense of reduced high-temperature adhesion properties. Polyhedral oligomeric silsesquioxanes (POSS) is considered a promising filler for enhancing high-temperature adhesion properties due to its excellent compatibility and nano cage-structured. Herein, the rigid cage-structured was covalently introduced epoxy adhesives to improve the high-temperature adhesion properties. The introduction of 1 wt% POSS significantly increased the high-temperature (120°C) adhesion strength by 197% and toughness by 283%. The POSS-reinforced adhesive also featured excellent wide temperature adaptability, indicating that it maintained high adhesion strength at various temperatures. Furthermore, POSS drastically enhanced the transparency of epoxy adhesive by three times. It is highly anticipated that this work will open a new avenue of designing epoxy adhesives with the excellent high-temperature adhesion properties and transparency.
研究领域:
材料科学
·
化学工程
·
胶粘技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hao Jiang,Shuailing Ma,Xingbin Zhao,Hao Zhang,Kaiping Hu,Yanping Huang,Tian Cui
High-purity and well crystalline Cr 2 AlB 2 ceramics were fabricated from Cr and AlB 2 powders using a high pressure and high temperature (HPHT) method. The effects of sintering temperature, duration and pressure on the sintering process were systematically investigated using X-ray diffractometry. Optimal sintering conditions were identified as 1600 °C, 5 GPa, and 1 h. Scanning electron microscopy analysis revealed that the Cr 2 AlB 2 sample possesses an elongated and lamellar microstructure, with individual layers measuring a few hundred nanometers in thickness. Cr 2 AlB 2 samples exhibited a Vickers hardness of 9.9 GPa, with outstanding mechanical properties, including high fracture toughness and Young's modulus of 5.3 MPa m 1/2 and 379.1–434.5 GPa, respectively. Transmission electron microscopy analysis detected edge dislocations, wrinkle defects, lattice twist and distortion within the crystals, all contributing to the enhanced hardness and toughness. X-ray photoelectron spectroscopy analysis reaffirmed prior findings regarding the anisotropic chemical bonding in Cr 2 AlB 2 , characterized by strong intralayer bonds and weak interlayer interactions. The electron transfer and capture between layers are crucial for stabilizing the Cr-B layer substructure.
研究领域:
材料科学
·
固体力学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Fengshun Du,Bohua Duan,Dezhi Wang,Zhuangzhi Wu,Xinli Liu
Improving the poor plasticity and fracture toughness of molybdenum alloys is the key to expanding their industrial applications. In this experiment, a cerium partially stabilized zirconia (Ce-PSZ) reinforced molybdenum alloy with outstanding properties was obtained by combining the hydrothermal method and the powder metallurgy technology. This study investigated how varying Ce-PSZ content influences the microstructure and mechanical properties of Mo/Ce-PSZ alloys. The results show that with increasing Ce-PSZ addition, the relative density and hardness of the alloys gradually increase, while the tensile strength, plasticity, and fracture toughness exhibit a tendency to initially increase and subsequently decrease. When 1.5 wt% of Ce-PSZ is added, the Mo alloys achieve excellent overall mechanical properties, with an ultimate tensile strength of 528.5 MPa, elongation of 29.3 %, and fracture toughness of 38.5 MPa∙m 1/2 . These values are about 22.7 %, 22.5 %, and 83.3 % higher than those of pure molybdenum. The substantial enhancement in elongation and fracture toughness can be predominantly ascribed to the refinement of grains and the stress-induced Ce-PSZ phase transformation. This research provides a novel method for the preparation of molybdenum alloys with high fracture toughness and elongation.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Hongyan Zhang,Yingze Li,Naiyu Jiang,Nan Zhou,Xiaohu Zou,Dongxing Zhang
The primary challenges in utilizing thermoplastic poly(ether-ether-ketone) (PEEK) stem from its inherent lack of toughness in production settings. Traditional methods of enhancing toughness often compromise other essential properties of the material. This research focuses on optimizing the toughness of PEEK resin composites by integrating graphene oxide (GO) and silicone rubber (SR) particles into the PEEK matrix to formulate multiphase composites. A detailed investigation was carried out to assess the impact of these two distinct particles on the PEEK resin properties. In the evaluation of toughness across various composite materials, a notable enhancement was evident in the GO/PEEK, SR/PEEK, and GO/SR/PEEK ternary composites compared to the pristine PEEK. Furthermore, these composites maintained comparable stiffness and thermal resistance to standard PEEK. Tensile strength, fracture absorbed energy, and fracture toughness in GO/SR/PEEK ternary composites versus pure PEEK indicated increases of 18.38%, 174.53%, and 46.37%, respectively. Fracture analysis demonstrated that multi-particle modification methods significantly complicated toughening mechanisms, including rubber voiding, matrix shear band formation, crack deflection, and matrix plastic deformation. The findings from this study propose a viable material design principle for engineering materials that effectively balance strength and toughness. Highlights The GO/SR/PEEK composites with a balance between strength and toughness. GO and SR exert a synergistic effect on the mechanical properties balance of PEEK. The plastic deformation is promoted as the main toughening mechanism. GO and SR enhanced PEEK crystallization, improving its mechanical properties.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuhua Cai,Lihong Geng,Song Chen,Shuo Shi,Benjamin S. Hsiao,Xiangfang Peng
Filaments comprising solely cellulose nanofibrils (CNFs) have been fabricated by flow-assisted assembling, where the strength can be improved greatly with the sacrifice of toughness. Inspired by the architecture of natural nacre and plant cell wall, the combined technique of convergent microfluidic spinning and in situ interfacial complexation between CNF and chitosan molecules was used to construct the filaments with hierarchical assembly of highly oriented CNFs locked by chitosan complexes, showing simultaneous enhancements of strength and toughness. In specific, the best performing filament exhibited a toughness of 88.9 kJ/m3 and a tensile strength of 1289 MPa because of the strong interfacial complexation interactions between CNFs and chitosan molecules. The tensile strength was further raised to 1627 MPa when the filaments were cross-linked synergistically by using Ca2+, surpassing the reported values in the literature. Molecular dynamics simulations revealed the possible fracture mechanism of the filaments under tension. With excellent mechanical performance and biocompatibility, the resulting CNF/chitosan filament system showed a promising application potential as nonabsorbable surgical sutures. The demonstrated spinning technology also offered a new avenue for the fabrication of high-performance filaments.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 27
·e55617
·
IF 2.7
Luze Wang,Boyu Cai,Wendi Xu,Zhonglin Luo,Biaobing Wang
Currently, the flame retardancy of epoxy resin (EP) was achieved at the expenses of the transparency and/or toughness. In the present work, a phosphorus/nitrogen-containing compound (FDNP) was synthesized by one-pot method using 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide, furfural and N-phenyl-p-phenylenediamine as raw materials, and further adopted as a functional agent for epoxy resin. The results demonstrated that the FDNP remarkably improved the fire safety of EP. The incorporation of 4 wt% FDNP enabled EP to pass UL-94 V-0 rating test and achieve a limiting oxygen index value of 35.5%; meanwhile, the peak heat release rate, total heat release rate and total smoke release were significantly reduced by 41.3%, 41.6% and 72.5% as compared with the pure EP, respectively. What is more, the EP/4 wt% FDNP composite kept almost the same transparency of the pure EP, simultaneously its impact strength was more than doubled as that of the pure EP. Herein, the improved flame retardancy is contributed to a synergistic biphasic flame retardant effect including the formation of a compact protective carbon layer and the release of both non-combustible gases and phosphorus-containing radicals.
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
危险品化学品经营许可证（带存储）