ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wei Tang,Hengyi Zhang,Dennis W. Hess,Chunmei Xie,Jing Liu,Xijuan Chai,Kaimeng Xu,Lianpeng Zhang,Hui Wan,Linkun Xie
Wood, as a natural biomass material, has long been a research focus. Superhydrophobic modified wood, in particular, has shown great promise in a myriad of engineering applications such as architecture, landscape, and shipbuilding. However, commercial development has encountered significant resistance due to preparation difficulties and sometimes unsatisfactory performance. In this study, hydrophobic/superhydrophobic wood comodified with methyltrimethoxysilane (MTMS) and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTMS) was fabricated by a one-step sol–gel method that uses an in situ growth process. Low-molecular-weight MTMS was allowed to permeate the three-dimensional porous wood interior. Then, acid–base catalysts were used to regulate the hydrolytic condensation process of MTMS and PFDTMS composite silanes to generate micro/nano hierarchical structures with low surface energy on the wood surface. The physicochemical characteristics of modified wood were investigated and the reaction mechanism established. The modified wood displayed excellent internal hydrophobicity/surface superhydrophobicity, water-moisture resistance, and dimensional stability at low fluorine concentrations. The resulting superhydrophobic surface provided stain resistance, self-cleaning ability, and loading capacity in water while exhibiting good mechanochemical stability; wood mechanical strength was also enhanced. This methodology created a superhydrophobic surface and bulk hydrophobization of wood in one step. Beyond wood, this approach is expected to provide a promising approach for functional modification of other porous composite materials.
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
JOURNAL OF CHEMICAL RESEARCH
·
2011
·
IF 0.55
Yong-Rui Pi,Jun Tan,Hui Liu,Jie Chen,Zhu-You Qun,Yan-Bo Zeng,Lei Li
Catalytic cracking reaction of 1,2-dimethyl-1,1,2,2-tetrachlorodisilane with a halobenzene (PhCl, PhBr) to prepare methylphenyldichlorosilane has been investigated. Pd(PPh3)4 exhibited the best catalytic activity among the catalysts used. The activity of chlorobenzene was significantly lower than that of bromobenzene. With the latter and toluene as solvent, in the presence of 0.3 mol % Pd(PPh3)4, the conversion of disilane was 100% with a selectivity to MePhSiCl2 of 97.1%.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3400
·
IF 4.6
Pengzhan Liu,Tianshun Yuan,Jin Peng,Wenjun Zou,Furen Xiao
A scheme for manufacturing heavy-duty rail grinding wheels with silicone-modified phenolic resin (SMPR) as a binder in the field of rail grinding is presented to improve the performance of grinding wheels. To optimize the heat resistance and mechanical performance of rail grinding wheels, an SMPR for industrial production of rail grinding wheels was prepared in a two-step reaction using methyl-trimethoxy-silane (MTMS) as the organosilicon modifier by guiding the occurrence of the transesterification and addition polymerization reactions. The effect of MTMS concentration on the performance of silicone-modified phenolic resin for application in rail grinding wheels was investigated. The molecular structure, thermal stability, bending strength, and impact strength values of the SMPR were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and mechanical property testing, and the effect of MTMS content on the resin properties was investigated. The results indicated that MTMS successfully improved the performance of the phenolic resin. The thermogravimetric weight loss temperature of the SMPR modified by MTMS with 40% phenol mass at 30% weight loss is 66% higher than that of common phenolic resin (UMPR), exhibiting the best thermal stability; in addition, its bending strength and impact strength were enhanced by approximately 14% and 6%, respectively, compared with those of common UMPR. This study utilized an innovative Bronsted acid as a catalyst and simplified several intermediate reactions in the conventional silicone-modified phenolic resin technology. This new investigation of the synthesis process decreases the manufacturing cost of the SMPR, liberates it from the restrictions of grinding applications, and enables the SMPR to maximize its performance in the rail grinding industry. This study serves as a reference for future work on resin binders for grinding wheels and the development of rail grinding wheel manufacturing technology.Keywords:silicone-modified;phenolic resin;rail grinding wheel;methyl-trimethoxy-silane;preparation;resin performance
研究领域:
材料科学
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化学工程
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 10
·2361
·
IF 5
Ting Pan,Zhenhua Su,Yue Yan,Xiaofei Zhu,Fan Qi,Lianbin Wu
As a bridge between the coating and the substrate, the primer has a direct impact on the adhesion performance of silicone resin thermal protection coating. In this paper, the synergistic effects of an aminosilane coupling agent on the adhesion performance of silane primer were investigated. The results show that silane primer containing N-aminoethyl-3-aminopropylmethyl-dimethoxysilane (HD-103) formed a continuous and uniform film on the surface of the substrate. Two amino groups of HD-103 were conducive to moderate and uniform hydrolysis of the silane primer system, and the introduction of dimethoxy groups was more conducive to the improvement of interfacial layer density and the formation of the planar surface structure, thus enhancing the bond strength at the interface. When the content was 13 wt%, it exhibited excellent synergistic effects on adhesive properties, and the adhesive strength reached 1.53 MPa. The possible morphology and composition of the silane primer layer were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). A thermogravimetric infrared spectrometer (TGA-IR) was used to analyze the thermal decomposition of the silane primer layer. The results showed that the alkoxy groups in the silane primer were first hydrolyzed to form Si-OH, and then the dehydration and condensation reactions between Si-OH and the substrate formed a firm network structure.Keywords:aminosilane coupling agent;synergistic effects;silane primer;adhesion property;silicone resin thermal protection coating
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Qiang Guo,Yu Qiao,Yonghou Xiao,Yi Pan,Yushan Li,Xu Liu,Gaohong He
Cuprous ion modified molecular sieves have been considered as promising CO adsorbents in gas separation or purification industry. However, it persists as a significant challenge to overcome the unfavorable effect of water vapor in the work environment on gas adsorption and separation. Herein, we propose a synthetic strategy using rare earth element La as an additive to form La O La coordination bonds followed by surface silanization treatment to construct a hydrophobic Si O Si barrier to significantly improve the stability of Cu + under humid atmosphere. By successively introducing La 3+ and Cu + into zeolite 5A, CuCl/LaA adsorbents were prepared via ion exchange and solid dispersion methods. And then by silanization modification using toluene as solvent and butyltrichlorosilane (BTS) as hydrophobic agent, hydrophobic CuCl/LaA-BTS adsorbents were prepared. Dynamic adsorption investigation demonstrated that the as-prepared CuCl/LaA-BTS adsorbents possessed hydrophobic surface and consequently the adsorption capacity of CO was enhanced significantly under humid atmosphere. The CO adsorption breakthrough capacity over CuCl/LaA-BTS attained 0.34 mg/g, which was 5.7 times higher than that of zeolite 5A at 40 °C, atmospheric pressure and a relative humidity of RH = 55 %. Moreover, the CO adsorption capacity of CuCl/LaA-BTS retained 0.31 mg/g after four cycle regenerations. This work provides an effective and novel route for synthesizing highly stable cuprous ion modified zeolite adsorbents.
研究领域:
材料科学
·
气体分离技术
·
表面改性
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Junfei Ou,Fajun Wang,Wen Li,Menghua Yan,Alidad Amirfazli
A super hydrophobic fabric (SF) has been fabricated by a simple immersion of the pristine cotton fabric into the composite silanes solution of hexadecyltrimethoxysilane (HDTMS) and methyltrimethoxysilane (MTMS). However, the cotton fabric treated by HDTMS solely possesses much inferior hydrophobicity as compared with the so-obtained SF and the cotton fabric treated by MTMS remains super hydrophilic. The methyl group in MTMS may be helpful for the long alkyl chain in HDTMS to form a well-ordered structure and thus the hydrophobicity of the composite silane is enhanced. The other benefits of adding MTMS to HDTMS are the shortening of the treating time to obtain the optimum hydrophobicity, which is 4 h for HDTMS and 1.5 h for the composite silanes, and the improving of the laundering / abrading durability of the SF. This work discloses new ways in understanding the silanes interaction and enlightens us on exploiting durable SF for practical application.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Futing Li,Youxin Li
A novel catalyst by preparing silica supported ethylenediaminetetraacetic acid (EDTA) platinum complex was developed. The preparation conditions, such as heating temperature and solvent types, were optimized. The catalyst was phosphine-free and sulfur-free which was characterized by infrared spectroscopy (IR), energy dispersive X-ray spectrometer (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), ultraviolet spectroscopy (UV) and atomic absorption spectroscopy (AAS). Its catalytic activity was evaluated by catalyzing solventless hydrosilylation reactions. In the hydrosilylation reaction between 1-hexene and methyldicholosilane, the new catalyst showed a higher catalytic activity than that provided by Spiere’s catalyst. Moreover, the new catalyst could be reused for 12 times without obvious loss of catalytic activity. To confirm its practical feasibility, catalyzing the hydrosilylation reaction between 1-octene and methyldichlorosilane was performed. Our results indicated that the new catalyst can efficiently catalyze the hydrosilylation reaction.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
·
2022
·
IF 2.865
Yulan Jian,Shaowei Lu,Wei Tang,Mingjun Shao,Fuhua San,Hui Wan,Linkun Xie
To explore the typical alkyltrichlorosilane and optimal volume ratio of the alkyltrichlorosilane-toluene solutions for preparing superhydrophobic Pinus kesiya wood, four alkyltrichlorosilanes: methyltrichlorosilane (MTCS), butyltrichlorosilane (BTCS), dodecyltrichlorosilane (DTCS), and octadecyltrichlorosilane (OTCS) were each used to modify the wood samples at different volume ratios of alkyltrichlorosilane-toluene solutions. The Pinus kesiya wood specimens were immersed in the solutions to fabricate superhydrophobic coatings on the wood surface. The wettability of the modified wood surfaces was characterized by water contact angle and water uptake values. The chemical composition of the wood samples was analyzed using X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), and the surface morphology of the modified wood samples was observed using scanning electron microscopy (SEM). The result showed that all types of alkyltrichlorosilane-modified wood changed from hydrophilic to hydrophobic. The wood specimens had the highest water contact angle of 151.8 ± 0.4° and lowest water uptake of 18 ± 0.6 wt.% when 0.25 vol.% MTCS and 0.25 vol.% OTCS solutions were applied, respectively.
研究领域:
材料科学
·
林学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Junfei Ou,Guoqing Zhao,Fajun Wang,Wen Li,Sheng Lei,Xinzuo Fang,Abdul Rahim Siddiqui,Yongmei Xia,Alidad Amirfazli
A superhydrophobic coating endows pristine hydrophilic wood with excellent water/moisture repellency and thus prolongs its service life. Generally, the superhydrophobic coating on wood is fabricated by a two-step process in which the nanoparticles are first introduced onto the surface and then modified by low-surface-energy molecules. Herein, for the first time, we have fabricated the superhydrophobic wood via a one-step process free of nanoparticles by immersing the pristine hydrophilic wood, such as pine, balsawood, and basswood, into a composite silane solution of hexadecyltrimethoxysilane and methyltrimethoxysilane. The wood remains superhydrophobic or highly hydrophobic after long-term exposure to mechanical damage (such as abrading, knife-cutting, and tape-peeling), chemical damage (such as immersion in acid, alkali, or ethanol), and environmental impacting (such as UV irradiation and low/high-temperature exposure).
研究领域:
材料科学
·
表面化学
·
木材科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Qinghong Zhang,Gongliang Wang,Xinlong Wen,Martin Hoch,Jie Mao,Xinyan Shi
Ethylene-vinyl acetate rubber (EVM) is commonly crosslinked by peroxides due to its saturated main chain. Nevertheless, it is usually accompanied by side reactions to bring unexpected bubbles in products. So, it is necessary to find an alternative and environment friendly crosslinking for EVM. Herein, a silane of γ -aminopropyltriethoxysilane (APTES) containing amino groups was adopted as monomer to graft on the matrix of a modified polymer of EVM named ethylene-vinyl acetate-glycidyl methacrylate terpolymer elastomer (EVM-GMA). EVM-GMA-g-APTES was prepared through melt blending followed by the moisture crosslinking, which was achieved in a 90 °C water bath with the aid of catalyst dibutyltin dilaurate (DBTL). It was found that the characteristic absorption peak belonging to the Si–O–C bond of the purified samples appeared at 1077 cm −1 on the infrared spectrum, indicating the reaction between amino groups in APTES and epoxy groups in EVM-GMA happened successfully. Besides, the moisture curing curves of EVM-GMA-g-APTES compounds kept rising over time, which denoted that the chemical crosslink occurred and the Si–O–Si networks had been formed. Additionally, the modulus and tensile strength of moisture crosslinked samples were elevated remarkably with the increasing APTES content, and the samples with 2.5 phr APTES had relatively rational mechanical properties . Moisture crosslinking was feasible for EVM-GMA since the mechanical performance of the moisture crosslink was better than that of the peroxide crosslink system at a similar crosslink density .
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
RUBBER CHEMISTRY AND TECHNOLOGY
·
2021
·Vol. 94
·期 4
·759-773
·
IF 1.868
Lin Zhengwei,Zhao Haotian,Chen Yanlu,Mao Jie,Hoch Martin,Shi Xinyan
An EPDM terpolymer grafted with silane vinyl triethoxysilane (EPDM-g-VTES) was prepared by melt grafting, with dicumyl peroxide (DCP) as an initiator. Next, dibutyl tin dilaurate was added as a catalyst to promote moisture crosslinking of EPDM-g-VTES. By means of the rheological response of the rubber compound, Fourier transform infrared spectroscopy, and moving die rheometer, the VTES graft ratio and DCP partial crosslinking (pre-crosslinking) of EDPM-g-VTES were characterized to show the feasibility of moisture crosslinking. The mechanical properties of moisture crosslinked EPDM-g-VTES specimens were tested by universal material tester. The results showed that when the weight ratio of VTES to DCP was fixed at 15:1, the VTES graft ratio and DCP partial crosslinking of EDPM-g-VTES increased with the increase of VTES content. But the torque in the moisture crosslinking curve of EPDM-g-VTES increased significantly with the extension of crosslinking time, which proved that EPDM grafted with VTES was cured by moisture successfully. The tensile strength and elongation at break of EPDM-g-VTES were improved by moisture cure. Furthermore, the moisture cured specimen with 3 wt% VTES had the best mechanical performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yulan Jian,Shuai Chen,Dennis W. Hess,Mengke Huang,Hengyi Zhang,Jiankun Liang,Linkun Xie
The widespread application of fast-grown timber species is hindered by their high susceptibility to water absorption, poor dimensional stability, and inadequate mechanical strength. In this study, poplar wood underwent a sequential impregnation process with methyltrimethoxysilane (MTMS) and an ammonia-ethanol mixture. This combined treatment allowed silane cross-linking with cell walls while also filling wood cavities, promoting the in-situ growth of nanoparticles. After the impregnation process, a subsequent surface treatment with methyltrichlorosilane (MTCS) was then performed to establish a hydrophobic surface layer. Through structural and surface modification, a novel double-layer hydrophobic system was constructed to enhance water resistance. The modified wood exhibits a surface water contact angle of 153.6° ± 0.5° and a 10-mm depth contact angle of 112.8° ± 0.6°, illustrating the effectiveness of the dual-layer hydrophobic structure. Compared to the control wood, the modified samples exhibited a 65.6 % reduction in 24 h water absorption and a 48.4 % decrease in volume swelling. Additionally, cross-linking and lumen filling considerably improved the mechanical properties of the modified wood. The double-layer hydrophobic system shows significant potential to extend the service life of wood and enhance its mechanical performance, paving the way for broader applications in moisture-sensitive environments.
研究领域:
材料科学
·
木材科学与技术
✓ 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）