POLYMER COMPOSITES
·
2020
·Vol. 41
·期 5
·2046-2053
·
IF 2.265
Chuyuan Jia,Runze Zhang,Chengce Yuan,Zhenyu Ma,Yunzhe Du,Li Liu,Yudong Huang
The 3-aminopropyltriethoxysilane (APS) grafted aramid fibers were prepared by γ-ray irradiation and chemical treatment to improve the interfacial properties between aramid fibers and epoxy matrix. The functionalization process of aramid fibers was investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectrum. After grafted with APS, the surface roughness of aramid fibers increased obviously, and the element content and composition of functional groups changed significantly in the modification process. Dynamic contact analysis indicated the wettability, and surface free energy of the fibers were greatly improved after the APS treatment. Monofilament pull-out measurement showed that the interfacial shear strength of aramid fiber reinforced composite increased by 51.03%, from 36.33 to 54.87 MPa after the surface modification. Moreover, benefited from the appropriate radiation and the APS grafting, the functionalization process did not damage fiber tensile strength.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 325
·期 2
·453-462
·
IF 1.137
Lu Shichao,Chang Shuquan,Li Zheng,Zhang Xiaohong,Hu Xiaodan,Zhang Haiqian
Magnetic Au/Fe 3 O 4 /poly(styrene-sodium styrene sulphonate) composite microspheres (Au/Fe 3 O 4 /P(St-NaSS) CMs) were successfully prepared via a gamma-radiation method. Au and Fe 3 O 4 were formed at the same time under irradiation and well dispersed on uniform P(St-NaSS) microspheres. The as-prepared CMs exhibit good catalytic properties and recyclable performances for the catalytic reduction of 4-nitrophenol (4-NP). The kinetic rate constants are 8.75 × 10 −3 s −1 and 7.71 × 10 −3 s −1 for two samples, respectively. The conversion rate of 4-NP can keep about 95% with catalysts after five cycles. They exhibit good magnetic behavior and have saturation magnetization value of about 9 emu g −1 , which can be easily separated from the solution under external magnetic field. This strategy is efficient and facile, which can be extended to fabricate other CMs.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 6
·1901839
·
IF 4.948
Yang Hu,Lin Wang,Tingrui Lin,Na Zhao,Mengni Shi,Jing Peng,Jiuqiang Li,Weiqun Shi,Maolin Zhai
As a new family of 2D materials, MXenes have already shown a broad application prospect in energy storage. However, the inevitable restacking of MXene nanosheets always limits their performance. Here, a facile and environmentally friendly approach is developed to fabricate self-assembly Ti 3 C 2 T x MXene (named SA-Ti 3 C 2 T x ) via γ-irradiation. The absorbed dose has obvious influence on the self-assembly of SA-Ti 3 C 2 T x by changing the surface charge characteristics and groups to make the nanosheets assembled into large slices with different structure. At dose of 20 kGy, radiation-synthesized SA-Ti 3 C 2 T x (SA-Ti 3 C 2 T x -20) possesses the crumpled structure which exhibits larger specific surface area, enhanced conductivity, and larger specific capacitance, compared with those of original Ti 3 C 2 T x . SA-Ti 3 C 2 T x -20 also shows excellent rate performance and cycling stability. This study paves the way for the modification and assembly of MXenes with improved electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
高分子化学
·
表面科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2014
·Vol. 4
·期 1
·1-6
·
IF 5.078
Zhang Ze,Chen Jie-Jie,Lyu Xian-Jin,Yin Hao,Sheng Guo-Ping
Decomposition of perfluorooctanoic acid (C 7 F 15 COOH, PFOA) has been gaining increasing interests because it is a ubiquitous environmental contaminant and resistant to the most conventional treatment processes. In this work, the rapid and complete mineralization of PFOA and simultaneous defluorination were achieved by γ-ray irradiation with a 60 Co source. The degradation rate of PFOA by γ-ray irradiation would be high and a pseudo-first-order kinetic rate constant of 0.67 h −1 could be achieved in the N 2 satured condition at pH 13.0. The experimental results and quantum chemical calculation confirmed that two radicals, i.e., hydroxyl radical (·OH) and aqueous electrons (e aq − ), were responsible for the degradation of PFOA, while only either e aq − or ·OH might not be able to accomplish complete mineralization of PFOA. The synergistic effects of ·OH and e aq − involved in the cleavage of C-C and C-F bonds and therefore complete mineralization of PFOA were achieved. The intermediate products were identified and the degradation pathway was also proposed. The results of this study may offer a useful, high-efficient approach for complete mineralizing fluorochemicals and other persistent pollutants.
研究领域:
环境化学
·
放射化学
·
污染物降解
·
量子化学计算
·
水处理技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 37
·期 5
·493-499
·
IF 2.016
Dong Li,Liu Xiang-Dong,Xiong Zheng-Rong,Sheng De-Kun,Zhou Yan,Yang Yu-Ming
Herein, excellent UV-absorbing poly(vinylidene fluoride) (PVDF) membranes were fabricated through the pre-irradiation induced graft polymerization method. The PVDF chains irradiated with 60 Co γ -ray were modified with the polymerizable UV absorber 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2 H -benzotriazole (RUVA-93). The influences of irradiation dose and monomer concentration on the prepared PVDF-g-PRUVA-93 membranes were investigated, and the optimal condition was eventually obtained. The chemical structures of the films were studied by 1 H-NMR, FTIR, and XRD. UV light transmittance and DSC tests were used to characterize the UV-absorbing performance and thermal property of the PVDF films before and after modification. The results proved that the PRUVA-93 side chains were successfully incorporated into the PVDF main chains and the obtained PVDF- g -PRUVA-93 films possessed remarkable UV-absorbing property. The modified membrane made under the optimized experiment condition could completely block the UV light in the range of 200−387 nm. Additionally, the transmittance of the PVDF- g -PRUVA-93 film could be reduced to 0.04% in 280−320 nm, where the light irradiation could damage polymer materials most seriously.
研究领域:
高分子材料科学
·
辐射化学
·
功能薄膜材料
·
紫外线防护
·
膜科学与技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）