MATERIALS LETTERS
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2025
·
IF 2.7
Xueyang Li,Rui Wu,Zichao Li,Guo Chen,Hanbin Zhou,Yucheng Zhang,Zhenggang Xiao
The erosion of barrel weapons is becoming increasingly severe with the application of high-energy gun propellants, which significantly reduces the service life. To address this issue, a type of microcapsules with hydroxyl silicone oil and urea–formaldehyde (UF) mixed with nano TiO 2 was prepared. The morphology, element distribution, thermal stability, and chemical composition were characterized by SEM, EDS, TG, and FT-IR, respectively. The results reveal that the structure of microcapsules is intact and nano TiO 2 was successfully embedded in the shell. Erosion simulation test was introduced to synthesize the erosion reducing by microcapsules. The erosion reducing rate could reach 11.63% when 2 wt% of microcapsules were added to triple-base gun propellants. And a deposit layer could be observed on the surface of erosion tubes. However, the limited addition of nanoparticles fails to provide effective protection.
研究领域:
材料科学
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机械工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 6
·065309
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IF 1.929
Ran Zhou,Haihong Ma,Zhengfa Zhou,Weibing Xu,Fengmei Ren,Chunhui Li
SiO2 particles were modified by γ-aminopropyltriethoxy silane (KH550) and γ-(2,3-epoxypropoxy)propyltrimethoxy silane (KH560) in sequence to prepare SiO2 particles with silicone-methoxy groups on surface (SiO2-s-Si(OCH3)3). X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA) were used to characterize the modified SiO2 particles. The SiO2-s-Si(OCH3)3 particles and tetramethoxysilane were used to co-cure hydroxyl silicone oil. The strong interfacial interactions between silicone rubber and fillers, which came from hydrolyzed SiO2-s-Si(OCH3)3 particles in situ reacting with hydroxyl silicone oil, had a great effect on the properties of composites. The mechanical properties, thermal conductivity, dielectric strength and volume resistivity of SiO2-s-Si(OCH3)3/silicone rubber composites were considerably higher than that of pristine SiO2/silicone rubber composites at the same content of SiO2, while the dielectric constant and dielectric loss tangent of SiO2-s-Si(OCH3)3/silicone rubber composites was lower than that of pristine SiO2/silicone rubber composites at the same content of SiO2.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2014
·
IF 3.633
Zhaofeng Wu,Hua Wang,Meng Xue,Xingyou Tian,Xianzhu Ye,Haifeng Zhou,Zhongyue Cui
Superhydrophobic surfaces with micro/nano structures were prepared using the synergistic effect of the hydroxyl-silicone-oil modified microscale tourmaline particles (HTP) and the nanoscale silica (SiO 2 ) by a simple spraying method. The SiO 2 /HTP/Polyurethane (PU) and HTP/PU dispersions were sprayed onto the waterborne polyurethane (WPU) film using a shower nozzle driven by an air compressor. After drying of the spraying film at room temperature, a surface with micro/nano structures was obtained and the micro/nano structures were consisted of the microscale HTP coated by the nanoscale SiO 2 . Static water contact angle measurements proved that the rough surfaces were superhydrophobic. Furthermore, their performance of releasing negative air ion was significantly enhanced due to the rough structure. Importantly, this method is simple, low-cost and suitable for the fast and large-scale preparation of superhydrophobic surfaces, which is particularly important for the modification of hydrophilic polymer surfaces .
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2024
·
IF 2.1
Ming Liu,Laiying Jing,Ziqi Zhang,Xin Li,Huaming Yuan,Jiaxi Cui,Mei Li,Yunqiang Zhang
With the increasing awareness of marine ecological environment, biocide-free marine antifouling coatings have been gaining increased attention in the field of marine antifouling. Among all the antifouling approaches, constructing fouling-release coatings (FRCs) may be the most effective and economical way caused by the biocide-free. However, the low mechanical strength, weak adhesion to substrates, and poor static fouling resistance of traditional silicone-based FRCs, which limiting their applications. In this work, we synthesized a polyurethane with hydroxyl terminated polydimethylsiloxane (PDMS), polytetrahydrofuran (PTMG) and isophorone diisocyanate (IPDI) as main chains, 2,2'-Bis (hydroxymethyl)butyric acid (DMBA) as chain extender, and γ-aminopropyl triethoxysilane (KH-550) as crosslinker by condensation polymerization. Meanwhile, Triclosan (TCS) was used as an antibacterial agent and mixed into the polymer system with uniformly dispersed. We introduced urethane groups into silicone, which improved the mechanical strength (ultimate tensile strength: 1.379 MPa, elongation at break: 282%). As a result, the laboratory bioassays using bacteria (E. coli, and S. aureus) showed that the anti-bacterial efficiency could respectively reach ∼95% and ∼93%, which demonstrated an outstanding antifouling property of the D:K = 0.7:1.3/1.0. This work overcomes the low strength issue of traditional fouling-release coatings and provides a simple strategy for silicone-based polyurethane antifouling coatings.
研究领域:
海洋防污
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材料科学
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高分子化学
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生物医学工程
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表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）