PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Peng Gao,Yanling Wang,Han Wang,Jing Wang,Xuehu Men,Zhaozhu Zhang,Yao Lu
Transparent, durable and smooth coatings with anti-fouling properties are highly desirable for many applications e.g. windows and touch screens. However, most of smooth anti-fouling coatings are limited by complicated preparation and application conditions such as synthesis at high temperatures or curing under ultraviolet irradiation. In this paper, two kinds of siloxane were cross-linked to form a highly transparent anti-fouling coating, which can be rapidly applied on different substrates by a facile brushing process (~3 min for curing) at room temperature. This coating has excellent anti-graffiti properties for liquids with complex components such as water-based and oil-based inks, furthermore, it also exhibits good flexibility, anti-reflection and anti-corrosion properties. The durability test shows that the performance of the coating remains unchanged under various harsh environments. This work would provide a pathway for developing solid and smooth anti-fouling coating, which is expected to be quickly applied in practice due to its simple principle and rapid preparation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 20
·24902-24909
·
IF 2.478
Yuan Zhigang,Wang Ting,Cai Wanan,Pan Zhongcheng,Wang Jun,Derradji Mehdi,Liu Wen-bin
A new kind of bisphenol A-type epoxy resin (E51) system cured at room temperature was prepared using ether bond- and fluorine-containing aromatic diamine, including 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (HFBAPP) and 2,2-Bis[4-(4-aminophenoxy)phenyl]propane (BAPP), and acrylic acid (HAA) as hardeners. The curing behavior of epoxy resin was investigated by differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) Spectroscopy. The thermal properties, dynamic thermomechanical properties, tensile properties, and dielectric properties of the cured epoxy resin at room temperature were evaluated with thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), universal tensile testing machine, and vector network analyzer, respectively. The surface morphology of the tensile fracture specimen was observed by scanning electron microscope (SEM). The results showed that the curing reaction for this kind of epoxy resin system can be conducted at room temperature without external heating. Compared to BAPP and 4,4′-Diaminodiphenyl methane (DDM), the cured E51/HFBAPP + HAA system demonstrated the best comprehensive properties, such as high thermal stability, high glass transition temperature and storage modulus, high tensile strength and modulus, and low dielectric constant and dielectric loss values at 2–18.3 GHz, which are mainly attributed to the introduction of flexible ether bonds and CF 3 groups into crosslinked epoxy network. SEM testing confirmed that E51/HFBAPP + HAA and E51/BAPP + HAA systems displayed good toughness.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
B. Wang,Z.Y. Li,J.N. Xu,F.Y. Liu,Y.D. Liu
Repetitive use and effective recycling of the materials are vital to overcome the current environmental challenges. In case of polymeric materials, the high curing temperatures significantly limit their application. In this study, a series of polymers with thermal reversibility at room temperature were synthesized. The main chain of the polymer systems was composed of polyethylene glycol diglycidyl ether (PEGDGE) and polypropylene glycol diglycidyl ether (PPGDGE). The polymers were obtained by initial chain-extension of furfurylamine (FA) and subsequent Diels-Alder (DA) reaction with bismaleimide (BMI). Fourier transform infrared spectroscopy analysis revealed that the material exhibited fast curing rate and high conversion rate, with the conversion rate reaching 98 %. DSC and DMA characterization demonstrated that the reverse reaction occurred at about 100℃. The tensile analysis confirmed that the mechanical properties of the developed materials remain largely unchanged after recycling, as compared with the existing materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuanlong Wu,Xin Shu,Yong Yang,Wei She,Lei Dong,Qianping Ran
Superhydrophobic surfaces show great application prospects in various fields, yet the tedious preparation process, sophisticated equipment, and poor durability restrict their large-scale practical applications. In this study, we proposed a simple and efficient approach to fabricating room-temperature curable superhydrophobic composite coatings by spraying the suspension composed of fluorinated silicon-based acrylic copolymer (FSC), amino-terminated polydimethylsiloxane (PDMS) and fluorinated SiO 2 nanoparticles (SiO 2 -F) on various substrates. Due to the special molecular design, our prepared coatings can be cured at room temperature. The resultant FSC15/PDMS/SiO 2 -F nanocomposite coating containing 40 wt% SiO 2 -F exhibited excellent superhydrophobicity with a high WCA of 160.4° and a low SA of 1.5°. The prepared coating also displayed satisfactory breathability, preventing structural degradation of the superhydrophobic coatings used in architecture. More impressively, the composite coating can sustain its superior water repellency even after being subjected to harsh mechanical durability damage, including sandpaper abrasion, water dripping, tape peeling tests, and rigorous working conditions, such as corrosive liquid environment, UV illumination, extreme temperatures, and ultrahigh humidity. Besides, the water-freezing time on the coated concrete sample can be postponed to 1860 s at −15 ℃, and the ice adhesion strength was reduced to 56.7 kPa. The facility and universality of the composite coating ensured that it could be applied on diverse material surfaces, including ceramics, tinplate, wood, glass, sponge, fabric filter paper, and cotton, which indicates the potential for large-scale application in industry.
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
HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Junjie Zhou,Kangkang Guo,Fan Wang,Yaping Zhu,Huimin Qi
Herein, the catalytic effects of aromatic amines with different structures on the room temperature curing of bisphenol E cyanate (BECy) have been studied using differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR) spectroscopy. Our results revealed that the mixed amine comprised of aniline and N,N-dimethyl-p-phenylenediamine (AN/NNDPA) bearing primary amino groups in its structure was a highly effective catalyst for the room temperature curing of cyanate esters. When the cyanate ester and mixed amine were combined at a molar ratio of 100:5 and cured at room temperature for 5 days, the curing degree of BECy resin reached 79.7%. The room temperature curing mechanism of the BECy-AN/NNDPA system was investigated using pyrolysis gas chromatography-mass spectrometry (PY GC-MS). Our results showed that the formation reactions of the intermediate structure and cyclotrimerization reactions occurred during the room-temperature curing process. The activation energies of BECy and different aromatic amine systems at different heating rates were determined using non-isothermal DSC. The results further demonstrated the catalytic effect of AN/NNDPA on the cyanate ester curing reaction. BECy-AN/NNDPA cured at room temperature has suitable heat resistance and a 5% weight loss temperature (Td5) of 361°C.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Qiushuang Zhang,Jinkang Dou,Minghui Xu,Bojun Tan,Hongchang Mo,Xianming Lu,Jianquan Wang,Ning Liu
The nitrile oxide-alkene curing system has attracted attention in the solid propellant field due to its byproduct-free, catalyst-free ligation and room temperature curing. For the propellant field, the design and synthesis of alkenyl-terminated adhesives are extremely important, where controllable distribution and quantity of alkene groups improve the integrity of the cross-linked network of the cured elastomers. Compared with traditional adhesives for propellants such as poly(ethylene glycol) (PEG) and polybutadiene (PB), poly(propylene glycol) (PPG) is both highly flexible and polar due to the presence of ether linkages and methyl groups. In this study, PPGs of different number-average molecular weights were used as raw materials and further modified by esterification and carbamate reactions to successfully obtain two types of alkenyl-terminated polymers, 1-PPG and 2-PPG. Based on the nitrile oxide-alkene click cycloaddition reaction, elastomers were then obtained at room temperature. Strikingly, due to the interaction of rigid and highly flexible structures, all of the elastomers exhibited excellent low-temperature mechanical properties (at −40 °C), particularly in terms of elongation at break (up to a maximum of 1126%). This research introduced different kinds of alkenyl-terminated adhesives in the propellant field, providing options for formulation design and promoting further application of the nitrile oxide-alkene curing system.
研究领域:
材料科学
·
推进剂化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Zhiming Ha,Lei Lei,Yuzheng Xia,Xiaonong Chen,Peng Mao,Bifa Fan,Shuxian Shi
It has been challenging to create a waterborne non-fluorinated anti-smudge coating product that is curable under ambient conditions (at room temperature and humidity) and performs superior repellence to both amphiphilic and lipophilic contaminants. Herein this work, this issue was addressed by introducing an aziridine (AZ) cross-linker into bio-based waterborne polyurethane grafted with 2 wt% poly(dimethylsiloxane) (WPU- g -PDMS) as an eco-friendly dewetting agent. The modified WPU- g -PDMS/AZ system achieves complete curing at room temperature, which enables the coating to have excellent anti-smudge and anti-corrosion properties. The results indicate the tri-functional AZ component could effectively cross-link with carboxyl groups present in WPU -g -PDMS under ambient conditions, preventing pollutants from adhering to the hydrophilic groups on the surface of the coating and significantly enhancing its anti-smudge performance. A wide range of contaminant liquids could slide off the coated surface without leaving any residues, and dust particles can be easily removed with a simple water wash, demonstrating its self-cleaning capability. Moreover, the anti-smudge characteristics of the coating could autonomously regenerate in instances of chemical corrosion or physical wear, highlighting its self-healing attributes. This study showcases the potential of utilizing bio-based materials and non-fluorinated dewetting agents to develop sustainable utility in both architectural and industrial applications.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Chaohua Peng,Longying Zhao,Xinjie Ma,An Huang,Guorong Chen,Weiang Luo,Conghui Yuan,Lizong Dai
Coatings with liquid repellent or antifouling ability are highly desirable in various fields. However, it is still a challenge to prepare solvent-free and room-temperature curable coating with high hardness, great antifouling performance, durability and large-area applicability. Herein, a novel strategy is reported to prepare organic/silicone hybrid coating by using amine-closed hyperbranched polysiloxane (SHPSi) as a latent curing, and diisocyanate containing a small amount of PFPE as an organic connecting part. In the presence of moisture, the mixture of the latent curing and the organic part can be cured at room temperature, and the smooth and low surface energy coating was obtained. The prepared hybrid coating had great transparency with the transmittance over 90 %. Due to the migration tendency of the PFPE to the air side, the surface energy of the hybrid coating decreased from 35.9 mJ/m 2 to 13.5 mJ/m 2 with 0.5 wt% PFPE, and the hybrid coating exhibited excellent antifouling ability. Besides, the hybrid coating can maintain the antifouling ability even after 2000 abrasion cycles. Furthermore, the great stability for various corrosive solutions and UV radiation was also achieved. More interestingly, the hybrid coating can be employed to protect various substrates, and large-area substrate was also realized. Therefore, this work would promote the application of high-performance organic/silicone hybrid coatings in an eco-friendly way.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2020
·Vol. 61
·期 6
·785-794
·
IF 0.976
Yonglin Lei,Yao Xiang
Abstract 2,5-Diethyl-1,4-benzenedinitrile N -oxide was designed and synthesized to achieve room temperature curing of hydroxyl-terminated polybutadiene binders. The structures and properties of the four cured elastomers having different content of curing agent were investigated. The results showed that the isoxazoline rings from the reaction of nitrile N -oxide with cis -alkene are observed in the four cured elastomers. The results also revealed that the hydroxyl-terminated polybutadiene with the lowest content of curing agent showed the lowest cross-linking density and stress at break. The proper activity and steric hindrance of 2,5‑diethyl-1,4-benzenedinitrile N -oxide gave better mechanical properties and hydrophobic properties of the cured elastomers than nitrile N -oxide prepared by our previous work.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 32
·20471-20480
·
IF 4.036
Xu Luo,Yu Li,Zhaoyi Sun,Guorong Wang,Jie Xin
In this study, carboxyl-terminated polybutylene adipate (CTPBA) was used to modify epoxy resin, and the modified epoxy resin was cured by a room temperature rapid curing agent (T-31). The effects of CTPBA modification on bonding properties and mechanical properties of epoxy resin adhesive at room temperature were carefully studied. Epoxy-terminated prepolymer was synthesized by pre-polymerization and its structure was characterized. Compared with the addition method of direct blending, the bonding properties and mechanical properties of pre-polymerized epoxy resin adhesive were significantly better. Compared with unmodified epoxy resin, CTPBA modification significantly improved the bonding strength. Furthermore, with the increase of CTPBA content, the shear strength of the material increased first and then decreased, and reached the maximum when the addition amount was 40 phr. This shows that the tensile strength of the material decreased with the increase of CTPBA content, and the elongation at break increased with the increase of CTPBA content. Dynamic mechanical analyzer (DMA) test results showed that the addition of CTPBA reduced the glass transition temperature, but broadened the damping temperature range. TG analysis showed that the thermal stability of the modified epoxy resin was good, and compared with pure epoxy resin, the initial temperature of thermal weight loss and the maximum thermal decomposition rate decreased, but the overall thermal stability was not significantly different. In summary, CTPBA modification of epoxy resin is expected to improve the comprehensive mechanical properties at room temperature.
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
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Yuan Tian,Kai Guo,Xiufang Bian,Tianqi Wang,Suhong Chen,Jiaxiang Sun
Room-temperature curable superhydrophobic composite coating (SHC) was fabricated on nitrocellulose lacquer using single-step spraying process. The suspension of perfluorosilane-coated silica nanoparticles was synthesized by sol-gel method at 60 °C. The groups of Si O Si and CF 2 are detected on the SHC by XPS and FTIR. The SEM and AFM images exhibit rough and hill-like morphology of the SHC. The contact angle on the SHC for deionized water reaches 161° with slide angle of 2°, and is still > 150° even for acidic and alkaline liquid. Cross-cut tape adhesion test manifests that adhesion force of superhydrophobic coating to nitrocellulose lacquer is a highest class of 5B according to ASTM D3359 standard. Furthermore, the SHC still keeps good superhydrophobicity by cross-cut tape adhesion test and exposure to outdoors for 300 days. After immersing in acid and alkali for 3 h or organic solvents for one week, water contact angle of SHC is still > 140°. The SHC with sufficient adhesion to various materials has excellent durability and chemical stability, prolonging service life of nitrocellulose lacquer via maintaining their self-characteristics.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Meng-Ying Liu,Hai-Yang Chen,Bin-Bin Wu,En-Hui Lv,Ling-Wei Che,Li-Min Chen,Li Zhao,Ji Liu,Guo-Dong Zhang,Jie-Feng Gao,Yong-Qian Shi,Long-Cheng Tang
Silicone resin, an organic-inorganic hybrid structure with an alternating Si-O-Si main chain, exhibits outstanding thermal stability, weather resistance, and electrical insulation, making it widely used in thermal protection materials, electronic packaging, and polymer-derived ceramics. However, its poor bonding performance and long curing temperature limit its potential application. Although introducing heteroatoms to form Si-O-X bonds enhances its thermal stability hardness and adhesion, existing modification methods suffer from long reaction times and require large amounts of organic solvents or halogen catalysts. In this work, we report a green and facile synthesis of borosilicone resin (BSi n R) via boric acid (BA) catalyst/modification without using halogen catalysts or organic solvents. Notably, introduction of boron element (B) significantly enhances the activity of the connected silicon methoxy groups, enabling room-temperature self-curing in humid environments by reducing curing temperature and time. When applied as a corrosion-resistant coating, BSi n R shows over 90 % visible light transmittance and 4H pencil hardness, and effectively protects tinplate from corrosion in 3.5 wt% NaCl solution. Additionally, at high temperatures, B promotes more complete and stable residual carbon structures on cured samples, effectively increasing T 5% to 402.5 °C and char yield to 84.9 %. Owing to its low viscosity, long-term storage stability (>2 months without precipitation), and excellent comprehensive properties, this facilely prepared BSi n R holds broad application prospects in aerospace, electronic packaging, and extreme-environment anti-corrosion coatings.
研究领域:
材料科学
·
高分子化学
·
表面工程
·
腐蚀防护
·
功能涂层
✓ 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）