Polymers
·
2021
·Vol. 13
·期 18
·3069
·
IF 4.329
Xiao Liu,Xiaofei Song,Ziming Wang,Chunlei Xia,Ting Li,Xiaoning Li,Qian Xu,Suping Cui,Shanshan Qian
A series of novel comb-like poly(butyl acrylate)-g-poly(dimethylaminoethyl methacrylate) (PBA-g-PDMAEMA) with different side chain lengths were designed and successfully synthesized by the “first main chain then side chain” method. Infrared Spectroscopy (IR),1H Nuclear Magnetic Resonance (1H NMR), and gel permeation chromatography (GPC) were used for structural confirmation and molecular weight characterization. This polymer exhibited responsive behavior from hydrophilicity to hydrophobicity under the alkaline environment of cement-based materials, with the contact angle of 105.6°, a decreased evaporation rate, and a hydrophile–lipophile balance (HLB) value. A significant internal hydrophobic effect on cement mortar was shown in the water absorption rate, which decreased by 75.2%, and a dry shrinkage-reducing rate of more than 30%. Furthermore, this polymer can effectively slow the exothermic rate, reduce the heat release, and delay the exothermic peak of cement hydration. It was interesting that these properties showed a direct correlation with the side chain length of the comb polymer. The aims of this study are to provide a new avenue to synthesize polymers with the spontaneous hydrophilicity–hydrophobicity transition in the cement system, achieving excellent internal hydrophobicity of cement-based materials, and to offer a promising alternative to resist external erosion for improving the durability and service life of cement-based materials.Keywords:hydrophilicity–hydrophobicity conversion;internal hydrophobicity;molecular design;cement-based material;hydration
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
POLYMER
·
2021
·
IF 4.43
Runan Gong,Han Cao,Hongming Zhang,Lijun Qiao,Xianhong Wang
Though cationic waterborne polyurethane (CWPU) has been regarded as an important environmental friendly material, it is hampered by poor water resistance due to incorporation of excessive hydrophilic groups to assure the stability of water dispersion. Here UV-curing in combination with terminal hydrophilicity induced dispersion strategy was employed to prepare water-resistant CWPU from CO 2 -polyol which was an oligoethercarbonate diol from telomerization of propylene oxide and CO 2 . In this system, multiple vinyl ether side chains were incorporated on CWPU backbone using 3-allyloxy-1,2-propanediol as functional chain extender to achieve efficient UV curing, and a small amount of terminal hydrophilicity was designed to ensure the stable dispersion of CWPU. The typical UV-cured CWPU film reached water absorption equilibrium at 72 h, maintaining water absorption rate as low as Ca . 5.8% even immersed in water for 240 h. Moreover, compared with traditional polyester and polyether polyols from petroleum resources, UV-cured CWPU from CO 2 -polyol not only used partially sustainable raw material like CO 2 , but also provided excellent water resistance in corrosive media for a long time (tensile strength retention above 90% for 336 h) due to hydrolysis resistant structure like carbonate and ether units in CO 2 -polyol.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Nanotechnology
·
2023
·
IF 4.2
Caining Zhang,Xuman Wang
Superhydrophobic cotton fabric with photoinduced reversibly switchable wettability was prepared by a coating of the hydrophobic copolymer and α-Fe2O3 nanoparticles. The surface morphology of the fabric was observed by scanning electron microscope (SEM). The wettability of the surface was tested under UV illumination and after storage in the dark. The chemical composition of the cotton fabric surfaces before and after UV illumination was analyzed using an X-ray photoelectron spectroscope (XPS) and FTIR. The experimental results showed that the prepared cotton fabric exhibited the excellent superhydrophobic property with a contact angle (CA) of 157.3 ± 2.9°, and became superhydrophilic after UV illumination for 64 h. The surface wettability reverted back to its initial superhydrophobic state after being stored in the dark for 30 d. Based on the XPS and FTIR analyses, the possible mechanism was discussed, and the switchable wettability was caused by the content change of the hydroxyl groups on the α-Fe2O3 surface. Moreover, the superhydrophobic cotton fabric also became superhydrophilic after sunlight illumination for 120 h.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 1
·314-322
·
IF 3.3
Chenhan Zhang,Zhihua Ying,Yuan Jiang,Haiyang Wang,Xuebin Zhou,Weipeng Xuan,Peng Zheng
Hydrophilicity and hydrophobicity are of paramount importance in surface chemistry. In this study, a solvent-controlled synthesis of hydrophilic and hydrophobic carbon dots (CDs) was prepared via a solvothermal process using pentafluorobenzyl alcohol as the carbon source in either deionized water or N,N-dimethylformamide (DMF) medium. By simply varying the reaction solvent to control the doping of nitrogen and fluorine elements, the hydrophilicity or hydrophobicity of the CDs could be regulated. Hydrophobic and hydrophilic CDs showed blue and green light under a UV lamp, respectively. Besides, we regulated the volume ratio of water/DMF (1 : 2, 1 : 1 and 2 : 1) in the reaction solvent to prepare amphiphilic CDs and further studied their hydrophilicity and hydrophobicity. Furthermore, the sensitivity of hydrophobic CDs to water was investigated. In water detection, the photoluminescent intensity of the blue peak and green peak showed high linearity within the water content of 4–80% and 10–80%, respectively (limit of detection = 0.08%, v/v, in DMF).
研究领域:
材料科学
·
表面化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Chaoquan Wei,Yu Han,Ting Wang,En Zeng
To overcome the persistent issue of poor water resistance in single-component waterborne automotive varnish coatings, a novel AAEM (acetoacetoxyethyl methacrylate)-modified acrylic resin has been developed for single-component, waterborne automotive coatings, delivering exceptional improvements in water resistance, thermal stability, and corrosion protection. By precisely adjusting the ratio of methyl methacrylate to butyl acrylate and integrating methacrylic acid and N , N -dimethylethanolamine to enhance hydration stability, the resin achieves optimal hardness, flexibility, and adhesion. The incorporation of 10% acetoacetoxyethyl methacrylate dramatically enhances water resistance, extending beyond 10 days, while improving thermal durability and barrier performance, as confirmed by thermogravimetric and electrochemical analyses. Remarkably, the varnish achieved a high crosslinking density at just 110°C, resulting in a durable coating with 2H hardness. These advancements deliver superior weatherability and longevity, positioning this eco-friendly varnish as an innovative solution that meets the automotive industry's growing demand for sustainable, high-performance coatings.
研究领域:
材料科学
·
汽车涂层技术
·
环保材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Chen Yu,Sun Junchao,Li Yongxu,Wang Yubao,Shi Shaofeng,Jiang Jing,Wang Hongzhen,Cao Lan
Developing polyurethane foams (PUF) with superior water absorption and retention remains challenging due to insufficient understanding of structure-–property relationships. This study systematically regulates the water content gradient (as blowing agent) in all-water-foamed PUF to optimize physicochemical properties. Comprehensive characterization via SEM, contact angle, water absorption, retention, and resilience tests reveals that water content critically governs microcellular architecture, surface hydrophilicity, and their synergistic effects on water management. The optimized formulation (2.5 phr water) achieves exceptional performance: 421.73% water absorption, 76.31% retention, and 55.10% resilience. These enhancements originate from uniform cell structures that harmonize hydrophilic group distribution with mechanical integrity. This work establishes fundamental guidelines for designing eco-friendly PU foams with balanced resilience and hydroscopic functionality, validated through theoretical and experimental insights.
研究领域:
材料科学
·
高分子科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Helong Zhang,Chuxiong Qiu,Rong Zhang,Hao Zhang,Yunxia Chen,Tao Zeng,Fen Qiao,Lee Li,Ghafar Ali,Xiujian Zhao,Yi Xie
We develop layered MAX (e.g., Ti 3 AlC 2 , Ti 3 AlCN, Ti 2 AlC, Ti 2 AlN) into novel photothermal silica-deposited MAX (MAX@SiO 2 ) composites and coatings for efficient seawater desalination and anti-/de-icing, by combining their strong optical absorbance capacity covering UV-Vis-NIR regions with unique surface wettability. The water evaporator with a unique gradient superhydrophilicity-hydrophilicity-hydrophobicity-superhydrophobicity is achieved by incorporating the as-synthesized hydroxyl- and methyl-modified MAX@SiO 2 composites into porous melamine foam (MF). By combining the unique gradient wettability with porous structure and strong optical absorbance, the proposed MAX@SiO 2 evaporator displays excellent seawater desalination performance with high water evaporation rates of ∼2.19 and 3.45 kg m −2 h −1 under 1.0 and 2.0 sun irradiation, respectively. The photothermal water evaporation efficiency can reach to 91.2 % under 1.0 sun illumination. Besides, by sequential spray-depositing resin-based primer and MAX@SiO 2 top-coat on glass slides and insulators, the as-achieved superhydrophobic (SH) photothermal coatings displayed excellent anti-icing and de-icing performances. The procedures described here enable a convenient and novel strategy to develop micro-nanocomposites and multifunctional coatings with strong photothermal conversion ability, which would shed light on promising potentials in energy conversion and photo-thermal applications including solar freshwater generation, sewage purification, and anti-/de-icing.
研究领域:
材料科学
·
环境工程
·
能源转换
·
光热应用
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Dandan Li,Dinggen Hu,Jihuai Tan,Qinghao Zhu,Zhulan Liu,Chen Su,Jianbin Chen,Yunfeng Cao
Paper derived from lignocellulose has great advantages over plastics as packaging material, nevertheless, the poor water- and oil-resistances of paper-derived products limited their application in high-end field. Herein, novel dimer acid-based waterborne polyurethanes (DWPUs) with different content of dimer acid-based polyester polyol (DG) were prepared and used as water- and oil-resistant coating for paper substrate. The effects of DG contents on water- and oil-resistances, mechanical properties and thermal stability of DWPUs coated papers were systematically investigated. When the content of DG reached up to 7 wt% (based on polyester glycol), the paper coated by DWPU exhibited 88.06% decrease in Cobb 60 value, 8.7 times increase in kit rating compared with uncoated paper. Meanwhile, DWPUs coated papers showed good mechanical properties and thermal stability. These improvements are attributed to the flexible long-alkyl chain, and six-ring structure of DWPUs as well as the continuous and homogeneous DWPU-derived membrane on the surface of paper. This study provides a new framework for the preparation of high quality, multifunctional, environmentally friendly water- and oil-resistant coatings for paper substrates.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
HOLZFORSCHUNG
·
2014
·Vol. 69
·期 3
·367-374
·
IF 2.339
Feng Liu,Zhengxin Gao,Deli Zang,Chengyu Wang,Jian Li
A three-step procedure has been developed for superhydrophobic coating on wood based on epoxy/silica materials in combination with hydrophobization. First, the epoxy resin is adhered to wood by immersing the samples into an epoxy resin acetone solution, then amino-functionalized silica particles are anchored by the epoxide groups, and finally, the created surface is modified by octadecyltrichlorosilane (OTS). The superhydrophobic surface not only is water repellent, as shown by the contact angle (CA) tests, but also decreases essentially the wood’s water absorption as determined by a 120-day water immersion test. The good mechanical stability of the coating was confirmed by a sand collision method.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2023
·Vol. 15
·期 8
·1065-1071
·
IF 0.9
He Ke,Liu Yong,Wu Yanqi,He Yanting,Hu Qing,Wu Jia,Cui Guangxun,Zhang Jun,Jin Jun
Due to the special surface wettability, self-cleaning, drag reduction, anti-icing and other properties, superhydrophobic materials are widely used as coating or coating additive on the surface of building materials, ships, and even for liquid transportation, biomedicine, etc., which
have become one of the research hotspots in the direction of coating in recent years. However, the hydrophobic surface itself has weak stability and poor durability, which affects its application value. Therefore, in this study, PS nano-microcapsule was prepared by the multiphase emulsion
method, and their particle size was measured by SEM electron microscopy to be about 350–550 nm, with a relatively uniform distribution. The hydrophobicity of PS nano-microcapsule modified with trimethoxy (1H, 1H, 2H, 2H-trifluoroctyl) silane (PFOTMS) at different molar ratios was investigated.
SEM results showed that the surface roughness of the modified PFOTMS-PS nano-microcapsule could be changed. The contact angle proved that the greater the content of PFOTMS, the better the hydrophobicity of the modified PFOTMS-PS nano-microcapsule. When the content reached 50%, the hydrophobic
performance was the best. As a coating, PFOTMS-PS nano-microcapsule has no specific requirement for the properties of the substrate material. It should be noted that the hydrophobicity of the coating did not change significantly after 30 days at room temperature. The above results indicated
that PFOTMS-PS nano-microcapsule had good hydrophobicity and stability, and is expected to be used in many fields such as waterproof textiles and architectural coatings in the future.
研究领域:
材料科学
·
涂层技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Cheng Jiang,Qihua Wang,Tingmei Wang
Thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) was grafted onto the cotton fabric by atom transfer radical polymerization (ATRP). Introducing 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTS) onto the surface, the density of PNIPAAm chains can be adjusted because of the competitive reactions of (3-aminopropyl) triethoxysilane (APS) and PFDTS. With the appropriate ratio of APS and PFDTS, the cotton fabric can be switched from superhydrophilic to superhydrophobic by controlling temperature. The prepared cotton fabric may find application in functional textiles, soft and folding superhydrophobic materials.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yanmei Zhu,Chao Zhou,Li Liu,Guangfeng Wu
A new crosslinker, terminal amine-based polybenzimidazole (PBI–4NH 2 ), was made by molecular structure design. The structure of PBI-4NH 2 is characterized by –NH 2 , which can interact with –NCO in aqueous polyurethane systems to form a crosslinking network in the main chain of WPUs efficiently. The PBI-4NH 2 contains five benzene rings, which can significantly improve the overall performance of WPUs. The impact of incorporating PBI-4NH 2 on the thermal resistance, hydrophobicity, and adhesion properties of WPU was examined. The enhancement of PBI-4NH 2 concentration in the WPU system markedly elevated the thermal stability of the coatings, as evidenced by the rise in the T50 % decomposition temperature from 374.1 °C to 394.6 °C. The system's water resistance was markedly enhanced, achieving a maximum water contact angle of 91.1° and a reduction in water absorption rate to 4.79 %. The film's peel strength rose to 3.53 N/mm, while the adhesion attained 1.24 MPa. The novel formulation demonstrated superior overall performance and offered significant reference value for the practical application of aqueous polyurethane coatings.
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
危险品化学品经营许可证（带存储）