POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Binzhi Wang,Yuewen Huang,Bin Wang,Ruixiang Zhou,Feng Wang,Hui Liu
In this study, an N, N-dimethyl-p-toluidine/benzoyl peroxide redox initiation system was used to synthesize a series of silicone-modified UV-curable acrylic pressure-sensitive adhesives (PSAs) via bulk polymerization. The oxidizing and reducing agents were added separately but simultaneously into a mixture of monomers. The impact of varying monomer content on the PSA's properties, as well as the influence of organosilicon incorporation on water and aging resistance, was evaluated through 180° peel strength and initial adhesion tests. The results demonstrated that the PSA without organosilicon modification exhibited a maximum peel strength of 7.21 N/25 mm and an initial adhesion of 8.41 N/25 mm. Although the introduction of the organosilicon structure reduced both peel strength and initial adhesion, it notably improved the PSA's water resistance and aging resistance. Highlights Synthesis without solvent using redox initiator system. UV-cured system to enhance molecular weight and adhesion. Introduction of silane structure to improve water and aging resistance. Adhesion performance testing on different substrates (PET and BOPP).
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Jing Lin,Taojin Wang,Jiali Zhou,Xiaodong Wu,Ziran Ma,Shuang Liu
In order to find out the reasons behind the steam-accelerated C 3 H 6 combustion over supported platinum, a Pt@TiO x /TiO 2 catalyst modified by silica (Pt@TiSi) with “super-hydrophilic” surface and metallic platinum sites was synthesized in the present study. In situ spectroscopy analyses excluded the structural change of platinum during reactions, suggesting water has to be involved chemically to accelerate the reactions. By comparing the water response and kinetics of the silica-modified and unmodified samples, a water-mediated O 2 adsorption and activation pathway (HOH···OO* → OOH*) was identified as the origin of the activity bonus induced by steam. Since OOH* formed readily at the interface between platinum and the hydrophilic supports (e.g., TiO x -SiO 2 ), Pt@TiSi exhibited drastically enhanced C 3 H 6 oxidation activity in the presence of moisture. Collectively, this work provides an extensible example about how to fabricate efficient catalysts for reactions with positive H 2 O rate orders, and how to unveil the water effects behind them.
研究领域:
催化化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2024
·
IF 1.6
Wenjing Zhao,Zhihui Sui,Qi Zhang,Lijian Sun,Fang Hu,Xiangyu Cao
Natural leather-based materials possess a combination of air permeability, wear resistance, and plasticity. However, conventional leather products have inherent limitations that make them unsuitable for unconventional applications. Therefore, it is necessary to develop new capabilities in order to overcome these limitations. In this study, we explored the conversion of regular leather into a high-strength product with hydrophobic properties through surface engineering. To achieve this, we synthesized polysiloxane-modified fluorinated waterborne polyurethane emulsions as functional coatings using emulsion polymerization. The structure and properties of the treated leathers were characterized using techniques such as Fourier transform infrared, thermogravimetry, X-ray photoelectron spectroscopy, X-ray diffraction, and scanning electron microscopy. The results demonstrated that the synthesized polysiloxane-modified fluorinated waterborne polyurethane successfully penetrated and combined with the fibers of the leather, resulting in excellent hydrophobicity. The water contact angle increased to 124.3°. Furthermore, the tensile strength and tear strength of unfinished leather are 875 N and 114 N, respectively. The application of waterborne polyurethane-derived functional additives as coatings resulted in a significant increase in tensile and tear strength of the leather by 60 N and 16 N, respectively. In addition, the softness of the leather increased from 7.6 mm to 10.09 mm. Overall, the use of this functional waterborne polyurethane coating will contribute to the diversification of leather applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Xudong Li,Junwei Wang,Xiaoyun Li,Qifeng Li,Maoqing Kang
Microcapsules with polydopamine composite shell layer were successfully synthesized by functionalizing silica-modified microcapsules containing isophorone diisocyanate. The components and micromorphology of silica-modified microcapsules at different reaction periods were studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The structure of different microcapsules was characterized by FTIR, 1 H nuclear magnetic resonance and x-ray photoelectron spectroscopy. The mechanical performances of different microcapsules were analyzed by nanoindentation technique. The compatibility and self-healing efficiency of different microcapsules with the substrate were also investigated by the tensile tests. The results showed that the density of the silica-modified microcapsule shell gradually increased and the mechanical performances were enhanced with the silica source. The hardness and elastic modulus of silica-modified microcapsules in suitable core fraction (76.5 wt%) were 139.9 MPa and 2.2 GPa, which are 2.3 times and 4.8 times higher than those of untreated microcapsules, respectively. The functionalized modified microcapsules had excellent compatibility with the elastomeric substrate (PU-PPG2000). At the same time, the self-healing efficiency of the functionalized modified microcapsules in PU-PPG2000 was 69.8%, which was 48.9% higher than that of the untreated microcapsules prepared under the same conditions. Silicon modification improved the density of microcapsules, enhancing their mechanical strength. At the same time, functionalization modification improved the interfacial bonding strength of microcapsules, further improving the compatibility with the polymer matrix. Highlights Microcapsules with different silicon sources are characterized. Microcapsules are functionalized with polydopamine. Individual microcapsules are tested for mechanical strength by nanoindentation. The compatibility of the functionalized microcapsules is excellent. The self-healing efficiency of modified microcapsules is greater than 70%.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 41
·e54523
·
IF 3
Guiyou Jiang,Song Wu,Wei Yan,Tian Tian,Yang Li,Youwei Liao,Yan Yang
This paper presents a viable coating design for the production of waterborne coatings using PUA, Silicone-modified-PUA, Al-SiO 2 , and PTFE as key ingredients. The coatings are prepared through an air compression spraying technique followed by a photocuring procedure. The resulting PUA/Silicone-modified-PUA/Al-SiO 2 /PTFE coating exhibits exceptional properties including high hardness, low surface tension, and a low coefficient of friction. Experimental findings reveal noteworthy characteristics of the coating. It possesses a gloss level of 4–6°, a hardness of 492.69 N/mm, an elasticity modulus of 11469.94 MPa, a surface roughness of 0.87 μm, a dynamic coefficient of friction of 0.125 μN, and a surface tension of 0.4967 mN/m. To assess its performance, the coating underwent rigorous tests such as the CS-5 Wool Touchpad Shinning Friction test with a 200 g load over 250,000 cycles. It exhibited minimal changes in gloss (≤2°) and color difference (∆E ≤ 0.75). Additionally, the CS-10 abrasive head Optical Surface Taber Abrasion Resistance test was conducted using a 500 g load for 10 cycles, resulting in a Class 1 rating, and after 100 cycles, it achieved a Class 3 rating. This demonstrates its remarkable resistance to tribological environments, enduring tapping, touching, and scraping by fingers over extended periods.
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 POLYMER RESEARCH
·
2023
·Vol. 30
·期 11
·1-12
·
IF 2.8
Li Heming,Wang Xinming,Gong Yuze,Zhao Hongbin,Liu Zhaobin,Tao Lin,Dastan Davoud,Ma Ke,Hu Zhizhi,Sun Mingming
In the area of Polymer dielectric materials, those with low dielectric constant and low dielectric loss have potential to be applied in high-frequency signal transmissions, such as antennae of mobile phones and millimeter-wave radars. This study is focused on producing fluorinated polyimide (PI) film with modified organosilicon (APDS). In this work, APDS was used to PI film. The spatial hindrance of Trifluoromethyl can reduce the high frequency dielectric loss of modified PI film. The length of molecular chain was decreased as increasing the proportion of APDS, which reduced the quantity of polar imide rings in unit volume. Meanwhile, the Si-O-Si bond combination in backbone decreased the integer polarity of PI film, which resulted in the decrease of tan ?. The values of ε and tan ? were 2.48 and 0.00335 respectively under 10 GHz. The values of ε and tan? were reduced to 6.6% and 36.5% respectively compared with base membrane. Thus, this work provides a simple method to reduce the dielectric constant and dielectric loss of PI film. Meanwhile, the relationship between dielectric properties and molecular structure was proved. PI molecules were separated by low dielectric groups, which resulted in a decrease in dielectric constant and dielectric loss.
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
RSC Advances
·
2015
·Vol. 5
·期 89
·72544-72552
·
IF 3.84
Fangfang Yu,Xiangyu Xu,Naibo Lin,Xiang Yang Liu
A series of modified waterborne polyurethanes were synthesized using a self-emulsifying method for high performance waterproof coatings, such as fluoride polyurethane (FPU), siloxane modified waterborne polyurethane (SPU) and the polyurethane containing fluorine and siloxane (FSPU). The structures of waterborne polyurethane were designed from scratch, and the contents of fluoride acrylic monomer (FMA) and siloxane contents (HO-PDMS) segments in FSPU were adjusted for high performance waterproof. It's found that the sample has lowest water absorption, higher water contact angles, and better mechanical/thermal properties, when the FMA content is 20 wt% and HO-PDMS content is 3 wt%. The mechanisms of improvement of contact angles were investigated, due to the vinyl group crosslinking, higher temperature can significantly improve the hydrophobicity of the films in emulsion polymerization and film forming process. Optimized FSPU has a promising future as a kind of waterborne waterproof coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Jingjing Li,Xiaoguang Li,Xiaoying Zhang,Jingxian Zhang,Yusen Duan,Xingbang Li,Dongliang Jiang,Takahiro Kozawa,Makio Naito
Indoor gaseous pollutants pose a great threat to human health, graphene aerogel (GA) has attracted more and more attention due to its high adsorption performance. However, the increase of the adsorption capacity together with high strength for long time and repeat using is still a challenge. In this study, a novel silica modification method was proposed to modify graphene aerogels with high strength and ultrahigh adsorption capability. Apart from its high adsorption capacity for liquid toluene, the adsorption capability to benzene, an indoor pollutant gas, was increased to 809.51 mg/g, which is higher than pure graphene aerogel and other carbon-based adsorbents such as graphene, activated carbon and single-wall carbon nanotubes. The enhanced adsorption performance is due to two reasons in addition to the electrostatic interactions. On one hand, tetraethyl orthosilicate (TEOS) could help to modify the pore structure of aerogel, reducing its average pore diameter and increasing its BET specific surface area. On the other hand, the addition of TEOS could help to improve the hydrophobicity of aerogel. The selective adsorption character of graphene aerogels to benzene/toluene binary system in the breakthrough experiment confirmed that the prepared graphene aerogels could also be used in the field of separation of multicomponent indoor pollutant gases.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Haolan Liu,Zhili Chang,Jie Fu,Zhaoyin Hou
Cu-based catalysts play pivotal role in many industrial processes, however, its application under high temperature is restricted due to the low Tammann temperature of Cu. Improving the stability and activity of Cu-based catalysts at high temperature is a challenge. In this work, a stable Cu/ZnO@SiO 2 catalyst was prepared, in which silicon was introduced into CuZn-BTC precursor via a steam-assisted hydrolysis method before calcination and reduction. Characterizations found that Cu/ZnO@SiO 2 catalyst prepared via above strategy possesses increased surface area, more exposed active sites and excellent stability for ethanol dehydrogenation than Cu/ZnO (prepared from CuZn-BTC without SiO 2 ). It was confirmed that the space-time yield of acetaldehyde reached 9.0 g-acetaldehyde/g-cat/h, and Cu/ZnO@SiO 2 could maintain its activity within 200 h at 350 °C due to the ZnO decorated Cu particles (Cu/ZnO) were encapsulated in the octahedral shaped SiO 2 hollow.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 11
·4342-4349
·
IF 1.941
Zhou Man,Zhai Shixiong,Song Tiantian,Zhao Hong,Fan Zhuizhui,Ge Fengyan,Zhao Yaping,Xu Bi,Cai Zaisheng
The acrylic adhesives with the flame-retardant property are necessary to meet the safety requirement in electrostatic flocking. In this study, acrylic emulsion chemically modified with phosphorus and silicone, PSE, with core–shell structure, was synthesized by introducing the vinyl silicone oil and phosphor-containing monomer (PAM-100) onto the molecular chain of acrylic ester polymer in the core and shell layer, respectively. Subsequently, the silicone-acrylic adhesive with flame retardation (FR-SA) was prepared by mixing PSE with inorganic flame-retardant, Al(OH) 3 . The acrylic adhesive obtains the excellent flame retardation under a low addition of Al(OH) 3 when the ratio of PAM-100 is 5%, while the commercial adhesive needs a high addition of the inorganic flame retardant to realize the satisfactory performance. FR-SA in this work has a great potential application as intrinsically flame-retardant electrostatic flocking adhesive.
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
WATER RESEARCH
·
2024
·
IF 11.4
Xin Huang,Junhao Huang,Kaiyun Wang,Mingming Hao,Mengze Geng,Baoyou Shi,Chengzhi Hu
Owing to the persistence and increasingly stringent regulations of perfluoroalkyl substances (PFAS), it is necessary to improve their adsorption capacities using activated carbon (AC). However, their adsorption capacities are suppressed by dissolved organic matter (DOM). In this study, two ACs modified with organic silicon (C-OS) and inorganic silicon (C-IS) were synthesized and used for the adsorption of PFAS in raw water (RW). The results showed that the PFAS adsorption capacity of C-IS was much less influenced by DOM than that of the original AC (C-virgin). In RW, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) adsorption capacities on C-IS were 15.08 and 3.65 times higher than those on C-virgin, respectively. DOM had less influence on the PFOA and PFOS adsorption kinetics of C-IS than C-OS and C-virgin. Under multi-PFAS condition, C-IS also exhibited slower desorption of short-chain PFAS and breakthrough in batch and column tests, respectively. Characterization of the ACs before and after adsorption and independent gradient modelling indicated that hydrogen bond interactions between the O-Si of C-IS and the –COOH or –CSO 3 H groups of PFAS contributed to PFAS adsorption. Density functional theory calculations demonstrated that the adsorption energy of C-IS was much lower than that of C-OS and C-virgin. The arrangement of PFAS molecules on C-OS was chaotic owing to the hydrophobic siloxane chain, whereas the arrangement of PFAS on C-IS was orderly in multi-layer or semi-micelle status and more favorable to PFAS adsorption. This study provides a new strategy for avoiding adverse effects of DOM on PFAS adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xia Wang,Linglong Xu,Hui Wang,Xiong Li,Qiao Zhang,Yue Gu
A serious of core-shell fluorine-silicon modified polyacrylic emulsion had been prepared by seeded emulsion polymerization. Methylmethacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA) were used as the monomers of polyacrylic core. And the shell of the emulsion was modified by polyacrylic with dodecafluoroheptyl methacrylate (DFMA), vinyl triethoxysilane (VTEO) and tetraethyl orthosilicate (TEOS). The completed of reaction was proved by fourier transform infrared spectroscopies (FT-IR). TEM analysis indicated core-shell structure of the hybrid particles. The surface analysis indicated that the excessive addition of VTEO-TEOS had a negative effect for the film. Electrochemical Impedance Spectroscopy (EIS) indicated that the anti-corrosion of the film went up first and then down with the increase of VTEO-TEOS content. The best anti-corrosion content of VTEO-TEOS was 1.0% (F-1.0Si). In this, the corrosion current density of the coating had reached 3.7×10 -8 A·cm -2 ，the efficiency of anti-corrosion was 99.53%, the water contact angle was 99° and the thermal decomposition temperature was 298°C. Two glass transition temperature indicated that the emulsion was the structure of two phases with different properties. The high-efficiency anti-corrosion time of film within 300 h was showed with immersion experiment.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）