COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Shuyan Yang,Junyu Tian,Xiaofei Bian,Yunhui Wu
Fly ash (FA) is a solid waste from coal-fired power stations, which can cause serious environmental problems without further treatment. Although FA has been successfully utilized in building materials , the reuse of FA in the polymer industry has remained a great challenge due to the difficulty in organically-modifying the smooth surfaces of FA particles. In this study, by introducing tannic acid (TA, a naturally occurring plant polyphenol), nitrile butadiene rubber (NBR)/FA/TA composites were prepared via a simple environment-friendly method. The properties of the products were thoroughly investigated and experiments showed that the TA incorporation into NBR/FA composites resulted in formation of hydrogen bonds among NBR, FA, and TA, leading to dramatic improvement in surface adhesion between NBR and FA. As a consequence, the tensile strength of the NBR/20FA/0.4 TA composite was ~110.4% larger than that of NBR/20FA composite, thus opening a new route to large-scale practical use of FA in the polymer industry.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Lingjiao Zhan,Chaozhong Wu,Fuqin Zhang,Juan Wang,Haotian Liu,Yutong Chen,Shuwei Yao,Yunzhu Ma,Wensheng Liu
The coordinated regulation for α-Al 2 O 3 and mullite structures in the alumina-mullite duplex fiber poses a challenging yet crucial task in achieving a fiber with exceptional high-temperature properties. In this study, Fe element was added into the alumina-mullite fibers in the form of iron sol and ferric nitrate solution, respectively, with the aim of obtaining a fiber consisting of fine mullite grains embedded with nano α-Al 2 O 3 grains. The results revealed that the addition of Fe element significantly enhances the crystallization process of mullite in alumina-mullite fibers. Specifically, adding iron sol resulted in the reduce of α-Al 2 O 3 formation temperature to 1300 °C, while introducing Ferric nitrate solution promoted the formation of mullite phase. Simultaneous introduction of 1.3 wt% iron sol and 1.3 wt% Ferric nitrate solution contributed to achieve alumina-mullite fiber with tensile strength of 2.06 GPa. In addition, the influence mechanism of Fe source on the phase transformation and microstructures of alumina-mullite fiber were discussed.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Shanshan Xu,Lu Qi,Chao Ma
Despite their great potential use in various textiles, cellulose viscose fibers are poor in tensile strength, thus hindering their practical application. In this work, viscose fiber with high tensile strength was prepared through in-situ functionalization with p-hydroxybenzaldehyde melamine-formaldehyde resin (PMfr). The successful incorporation of PMfr into the viscose fiber was proven by FT-IR and nitrogen content analysis. The introduction of PMfr can build up a polymeric network with fiber through cross-linking interactions, enabling the tensile strength of the PMfr@viscose fiber to increase from 1.90 to 2.4 cN/dTex. The results suggest that the strategy of incorporating PMfr into the viscose fiber is very efficient in enhancing its tensile strength, which may also have the potential to improve the mechanical properties of other fibers.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Lisong Hu,Yitong Xie,Shishuai Gao,Xiaoyu Shi,Chenhuan Lai,Daihui Zhang,Chuanwei Lu,Yi Liu,Lei Du,Xuezhi Fang,Feng Xu,Chunpeng Wang,Fuxiang Chu
Stretchable and tough polysaccharide-based functional hydrogels have gained popularity for various applications. However, it still remains a great challenge to simultaneously own satisfactory stretchability and toughness, particularly when incorporating renewable xylan to offer sustainability. Herein, we describe a novel stretchable and tough xylan-based conductive hydrogel utilizing the natural feature of rosin derivative. The effect of different compositions on the mechanical properties and the physicochemical properties of corresponding xylan-based hydrogels were systematically investigated. Owing to the multiple non-covalent interactions among different components to dissipate energies and the strain-induced orientation of rosin derivative during the stretching, the highest tensile strength , strain, and toughness of xylan-based hydrogels could reach 0.34 MPa, 2098.4 %, and 3.79 ± 0.95 MJ/m 3 , respectively. Furthermore, by incorporating MXene as the conductive fillers, the strength and toughness of hydrogels were further enhanced to 0.51 MPa and 5.95 ± 1.19 MJ/m 3 . Finally, the synthesized xylan-based hydrogels were able to serve as a reliable and sensitive strain sensor to monitor the movements of human beings. This study provides new insights to develop stretchable and tough conductive xylan-based hydrogel, especially utilizing the natural feature of bio-based resources.
研究领域:
材料科学
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生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 45
·期 3
·493-502
·
IF 1.634
Zhicheng He,Zhixun Xia,Jianxin Hu,Likun Ma,Yang Li
To study the mechanical properties of lithium-perchlorate/polyvinyl alcohol-based aluminized electrically controlled solid propellant (LP/PVA-Al-ECSP), the effects of Al particle size, grading, and content on the mechanical properties of the propellant at various temperatures were investigated. The uniaxial tensile experiments were conducted over the temperature range from −40 °C to +50 °C using universal testing machine with a crosshead speed of 100 mm min −1 . A scanning electron microscope (SEM) was employed to observe the fracture surface morphologies of the specimens. The results indicate that Al powder and temperature greatly affects the mechanical properties of the composite propellant. From experiments in which the size and the fine-to-coarse ratio of Al were changed at constant solid loading, the tensile strength and initial modulus of the propellant are improved with the increase of Al particle size and coarse-to-fine ratio at 25 °C. The increase in Al content improves the tensile strength and initial modulus of the propellant, whereas reduces the elongation. The results of experiments in which the temperature changed indicate that the tensile strength and initial modulus of the propellant are improved at low temperatures, whereas the mechanical properties of the propellants deteriorate at high temperatures. The elongation of the propellants is greatly reduced at low temperatures. The stress−strain curve of ECSP shows three regions at low temperatures and five regions at room temperature and high temperatures. The LP/PVA-Al-ECSP has poor tensile strength and initial modulus, whereas its elongation is extremely high at room temperature. The propellant with 5 μm Al to 65 μm Al ratio of 3/7 exhibits the best comprehensive mechanical properties.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 53
·42362-42368
·
IF 3.84
Zhengguang Heng,Yang Chen,Huawei Zou,Mei Liang
A PEG-b-CTBN diblock copolymer was synthesized via the esterification reaction of hydroxy terminated methoxypolyethylene glycols (PEG) in the presence of a carboxyl-terminated butadiene-co-acrylonitrile copolymer (CTBN) with 4-dimethylaminopyridine (DMAP) as the catalyst. Epoxy thermosets were modified via the formation of a nanostructure. The result of transmission electronic microscopy (TEM) shows spherical domains were homogeneously dispersed into the continuous epoxy matrix and the size is nano-scale. It was noted that the glass transition temperatures decreased with an increase in the content of PEG-b-CTBN, which was evidenced by Dynamic Mechanical Analysis (DMA) and a Differential Scanning Calorimeter (DSC). Through mechanical tests, we found the tensile strength and fracture toughness of epoxy resins were simultaneously enhanced by nanostructured PEG-b-CTBN.
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
Journal of CO2 Utilization
·
2017
·
IF 4.292
Zhong Ying,Chaoyong Wu,Chao Zhang,Shan Jiang,Ruhui Shi,Haiyang Cheng,Bin Zhang,Yan Li,Fengyu Zhao
A series of polyureas were synthesized with CO 2 as the carbonyl building block, which consist of a hard segment of CO 2 -based oligourea and a soft segment of soluble polyether diamine. The hard segment was formed from 1,3-bis(3-aminopropyl) tetramethyl disiloxane with CO 2 , and the soft segment was obtained through polyaddition of polyether diamine with an extender agent. The Number-average Molecular Weight (Mn) and Weight-average Molecular Weight (Mw) were estimated by Gel permeation chromatography (GPC). The properties of the synthesized polyureas such as thermo-stability and the tensile strength were examined, and these properties could be adjusted by varying the molecular weight of polyether diamine and oligourea segments. The synthesized polyureas have an amorphous structure and presented satisfied thermo-stability (∼250 °C) and the high tensile strength (22.4 MPa).
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
Small
·
2024
·
IF 13
Ning Yu,Bingxu Cheng,Yang Liu,Wei Wu,Robert K. Y. Li,Zihui Liang,Fangchao Cheng,Hui Zhao
The development of self-healing materials provides a new opportunity and challenge for advancing triboelectric nanogenerators (TENGs). However, the low strength and low toughness of self-healing triboelectric materials often result in the deformation or breakage of TENG under high mechanical loads, thereby limiting their potential applications. Herein, a new strategy for fabricating self-healing triboelectric materials is reported, which introduces cross-linking networks with hydrogen bonds and metal coordination bonds. The desired high performance can be achieved by simply adjusting the molar ratio of the metal to the ligand. When the molar ratio is 1:2, the tensile strength, toughness, and elongation at break of the material reached 13.7 MPa, 76.9 MJ m −3 , and 1321%, respectively. Furthermore, its self-healing efficiency can reach 74% at 70 °C in 6 h. Working in contact-separation mode, the electrical output can reach 164 V, 18.2 µA, 57.5 nC, with a maximum power density of 2.54 W m −2 . Notably, even if it is sheared, the electrical output performances of TENG can be completely recovered to the original state. In addition, the developed TENG exhibits excellent output stability over 10 000 contact separation cycles. This study presents a promising approach for the development of stretchable smart generators.
研究领域:
材料科学
·
纳米技术
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Song Duan,Baojie Dou,Xiuzhou Lin,Shixiong Zhao,Wilfred Emori,Jilin Pan,Hao Hu,Hang Xiao
In this study, uniform sized ZIF-8 was synthesized by microemulsion method, and a series of ZIF-8 modified epoxy coatings with different mass fractions were successfully prepared. EIS analysis revealed the improved anti-corrosion performance of the modified epoxy coating with increasing mass fraction of ZIF-8 fillers, and this was confirmed by the results of the salt spray and adhesion tests . In addition, the tensile strength and friction properties of the epoxy coating have also been greatly improved. These phenomena were explained by the chemical cross-linking between ZIF-8 fillers and epoxy. The chemical cross-linking increased both the cross-linking density and the barrier performance of the epoxy coating, consequently improving its anti-corrosion and mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Haotian Jiang,Yanxiang Wang,Chengjuan Wang,Mengfan Li,Zhenhao Xu
Carbon nanotubes (CNTs)/carbon fiber (CF) reinforcements were synthesized under different catalyst compositions and reduction conditions. The effects of the catalyst, reduction temperature and reduction time on the surface morphology , graphitization, and single filament tensile strength of the prepared CNTs/CF samples were investigated. When nickel was used as the catalyst and copper as the catalyst promoter, with the increase of copper concentration, the catalytic activity increased. Thus, the carbon source was consumed more completely, improving the abundance of CNTs with good graphitization. And the effect of repairing CF defects was more obvious, hence the single filament tensile strength accordingly increased. Besides, the increase of catalyst reduction temperature and reduction time intensified the etching of CF by catalyst, and decreased the single filament tensile strength of CF. With the deposition of CNTs, the tensile strength of CF was enhanced in varying degrees. When the concentration of cooper was 0.01 mol/L with the reduction time of 10 min and reduction temperature of 450 °C, CNTs/CF had the highest tensile strength, which can reach up to 4.51 GPa. We determined that bimetallic catalysts could adjust the catalytic activity of nickel. The change of reduction time and temperature would affect the quality of CNTs, which was helpful to obtain high quality CNTs on CF surface and improve the mechanical properties of CNTs/CF and its composites.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jianbin Mo,Junjie Lei,Haixu Wang,Qingpeng Kang,Weifeng Liu,Xueqing Qiu
The characteristics of multi-hydroxyl structure and strong hydrogen bonding in polyvinyl alcohol (PVA) make its melting point close to its decomposition temperature, causing melt-processing difficulty. In this work, following the plasticization of small-molecule primary plasticizer acetamide, lignin was demonstrated as a green secondary plasticizer in realizing the melt processing and simultaneous reinforcement of PVA. During the plasticization process, lignin was able to combine with the hydroxyl groups of PVA, so as to destroy the hydrogen bonds and regularity of the PVA chains. The synergistic plasticization effect of lignin dramatically reduced the melting point of PVA from 185 °C to 151 °C. The thermal processing window of PVA composites was expanded from 50 °C to roughly 80 °C after introducing lignin. In contrast to acetamide, the addition of lignin significantly increased the tensile strength and Young's modulus of the composites to 71 MPa and 1.34 GPa, respectively. Meanwhile, lignin helped to hinder the migration of acetamide via hydrogen bonds. With the addition of lignin, the composites also displayed enhanced hydrophobicity and excellent UV shielding performance. The strategy of synergistic plasticization of lignin provides a feasible basis for the practical application of lignin in melt-processable PVA materials with good comprehensive properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2025
·
IF 4.8
Zhang Xue,Lei Ming,Ren Junming,Li Zhaoqian,Duan Xikai,Shen Jinpeng,Pei Chonghua
Although the solubility of nitrocellulose (NC) in solvents has been extensively studied, its processing properties are still not fully explored in different solvents. Research in this area can minimize the waste of resources and promote its development in industry. In this study, the effect of six solvents [diethylene glycol monomethyl ether (DM), N, N- dimethylformamide (DMF), acetone (AC), ethyl acetate (EAC), anhydrous ethanol (EtOH), and ethyl ether (DEE)] on the properties of nitrocellulose was investigated using density functional theory (DFT) simulations and experimental approaches. The results showed that the solvents, temperature, and concentration significantly impacted the rheological properties of nitrocellulose. The DM system had the highest sensitivity to the temperature, with a flow activation energy of 12.238 kJ/mol. The DMF system had the lowest viscosity, with an apparent viscosity of 2076 Pa·s. Additionally, the tensile strength of NC gun propellants was strongly influenced by the solvent used; the gun propellant prepared with EAC achieved the highest tensile strength (up to 70 MPa) and left the least solvent residue. In contrast, the DMF system exhibited a high solvent residue, likely due to its high molecular interaction energy ( − 14.48 kcal/mol). The burning process of NC gun propellants prepared by various solvents remained steady and consistent. The results provided some theoretical basis for solvent selection in the production of single-based gun propellants.
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）