PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Jingcheng Liu,Kuan Wang,Licheng Lin,Ren Liu,Yazhen Xie,Fei Gao,Xiaoya Liu
The fluorinated polyimides with double bond end groups (G-FPIs) based on 4,4′-(hexafluoroisopropylidene) diphthalic anhydride, 4,4′-(hexafluoroisopropylidene) dianiline, 4-aminobenzoic acid and glycidyl methacrylate were synthesized via a typical two-step imidization method. The structure and properties of G-FPIs were characterized by Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ( 1 HNMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). It was determined that all G-FPIs were the amorphous phase and easily soluble in many polar organic solvents, and the G-FPIs had high glass-transition temperature ( T g ). Then, UV-curable coatings were prepared from G-FPIs, and the properties were evaluated by real-time fourier transform infrared (RTIR), thermogravimetric analysis (TGA), UV–vis spectroscopy, water contact angle and water absorption test. Results showed that these coatings possessed favorable double bond conversion, excellent thermal stability, higher optical transparency and lower moisture uptakes. Moreover, the coatings exhibited good hardness and excellent gloss. Due to the outstanding combination properties, these UV-cured coatings based on G-FPIs could be considered as potential candidates for photoelectric, microelectronic and aerospace materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 16
·16448-16455
·
IF 2.76
Zhou Shiqing,Xia Ying,Li Ting,Yao Tian,Shi Zhou,Zhu Shumin,Gao Naiyun
Pharmaceuticals in water are commonly found and are not efficiently removed by current treatment processes. Degradation of antiepileptic drug carbamazepine (CBZ) by UV/chlorine advanced oxidation process was systematically investigated in this study. The results showed that the UV/chlorine process was more effective at degrading CBZ than either UV or chlorination alone. The CBZ degradation followed pseudo-first order reaction kinetics, and the degradation rate constants (k obs ) were affected by the chlorine dose, solution pH, and natural organic matter concentration to different degrees. Degradation of CBZ greatly increased with increasing chlorine dose and decreasing solution pH during the UV/chlorine process. Additionally, the presence of natural organic matter in the solution inhibited the degradation of CBZ. UV photolysis, chlorination, and reactive species (hydroxyl radical •OH and chlorine atoms •Cl) were identified as responsible for CBZ degradation in the UV/chlorine process. Finally, a degradation pathway for CBZ in the UV/chlorine process was proposed and the formation potentials of carbonaceous and nitrogenous disinfection by-products were evaluated. Enhanced formation of trichloroacetic acid, dichloroacetonitrile, and trichloronitromethane precursors should be considered when applying UV/chlorine advanced oxidation process to drinking water.
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PubMed
高影响因子
Journal of Coatings Technology and Research
·
2016
·Vol. 13
·期 6
·1115-1121
·
IF 1.342
Liang Tao,Li Hongqiang,Lai Xuejun,Su Xiaojing,Zhang Lin,Zeng Xingrong
The super-hydrophilic polymer coating film can easily be be peeled off from a substrate with the existence of water, which is a fatal drawback in practical applications. Herein, a facile approach is proposed to prepare UV-curable super-hydrophilic polyacrylate coating film that is chemically grafted on the surface of γ -methacryloxypropyltrimethoxysilane-modified glass substrate. Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that the polyacrylate coating films were successfully grafted onto the glass substrate and exhibited rough micro-groove structure. The obtained polyacrylate coating film possessed super-hydrophilicity with the water contact angle close to nearly zero as well as good transmittance and antifogging property.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Shuangni Shi,Jingting Zhang,Yi Yang,Biyang Ling,Linyan Yao,Jianxi Xiao
Excessive UV radiation is one of the most common factors contributing to skin damage, manifesting as desquamation, inflammation, and even the development of skin cancer. Collagen has been developed for the treatment of photodamaged skin; however, the risk of pathogen transmission and its limited ability to penetrate the skin barrier have significantly restricted its clinical applications. Transdermal nano collagen, a type of short synthetic collagen, has attracted growing attentions for its ability to mimic the structure and function of natural collagen, while its applications in skin repair dressings remain unexplored. Herein, we have for the first time developed a novel type of transdermal nano collagen dressing (TNCD) for accelerated healing of photodamaged skin. The TNCD was formulated using the transdermal nano collagen, GRR2, as the efficacious ingredient, exhibiting highly stable physical and chemical properties. DermaLab Combo evaluations revealed that, compared to commercial collagen dressings, TNCD significantly accelerated the recovery of skin density, erythema index, and transepidermal water loss (TEWL) in damaged skin to levels comparable with healthy skin. Histological analyses further confirmed that TNCD effectively repaired photodamaged skin by promoting the regeneration of collagen fibers. Transdermal nano collagen dressings present promising strategies for improving collagen absorption through the skin and promoting wound healing, with significant market potential in the field of advanced skincare products.
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POLYMER BULLETIN
·
2024
·
IF 3.1
Yu Tingting,Wang Xu,Hu Yuehang,Zhao Yang,Zhu Cenming,Cheng Liang,Kong Linghan,Zheng Han,Yue Baoshan,Zhan Jianbo,Yu Zhenhua,Wang Hao,Zhang Ying
In this work, a bio-based resin of acrylated epoxidized soybean oil (AESO) mixed with three types of active diluents (Isoborneol methacrylates [IBOMA], tripropylene glycol diacrylate [TPGDA], and Ethoxylated trimethylolpropane triacrylate [ETPTA]) is used to form a protective UV-curable coating film on calcium alginate water-carrying microspheres (CA-WCMs). Calcium alginate microspheres (CAMs) have previously been used to encapsulate only ester soluble or oil-in-water core materials, thus limiting their application. After UV-curing with an increased active diluent dose, the pencil hardness, pendulum hardness, and mechanical strength of the CAMs increased. A photopolymerization kinetics study reveals that the maximum double bond (C=C) conversion rates of AESO-IBOMA, AESO-TPGDA, and AESO-ETPTA are 95, 92, and 86%, respectively, and the maximum conversion rate of C=C bond is 87% in their mixed system. Additionally, the water retention rate of the water-carrying microspheres (WCMs) increased with an increasing number of coating layers, plateauing after the number of layers exceeded four. The water retention is favorable, with more than 75% of the water stored for a duration of 50 days. Overall, the cost-effective and environmentally friendly method has shown encouraging results in the acquisition of water-absorbing CAMs, with the potential to overcome existing implementation constraints.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Shuotian Wang,Haizhi Dou,Yanjing Gao,Fang Sun
This study reports the successful synthesis of a novel tetrafunctional oxetane-based organosilicon monomer (QOX-Si), through a hydrosilation reaction. The monomer effectively boosts the photopolymerization efficiency of the blend consisting of 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (E4221) and 1,2-epoxy-4-vinylcyclohexane (VOH). This improvement is particularly evident with the addition of 1.5 mol% QOX-Si, achieving an optimal conversion rate of 69.3 %. The integration of QOX-Si into UV-curable films results in remarkable improvements in thermal stability, as evidenced by increased T 5% and T max values to 302 °C and 420 °C, respectively, the films demonstrate an elevated glass transition temperature (T g ) of 204.4 °C, alongside exhibiting a remarkable gel yield of 98.3 %, a water contact angle of 91.3°, and enhanced Shore hardness reaching 87.2 HD. Moreover, the adhesion properties of the cured film are notably improved, particularly on PVC and glass substrates. These findings emphasize the promising role of QOX-Si in enhancing the performance standards of polymeric materials, particularly in applications that require superior thermal stability and robust mechanical properties.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 26
·e55566
·
IF 2.7
Lingzhi Wang,Hua Liu,Haojie Wang,Birong Zeng,Xiaohui Liu,Yiting Xu,Weiang Luo,Guorong Chen,Conghui Yuan,Lizong Dai
Carbon dots (CDs) are a novel class of carbon material which have gained widespread usages owing to their exceptional optical properties, low toxicity, and high biocompatibility. The nitrogen-doped carbon dots (N-CDs) using a normal curing agent of 4,4′-diaminodiphenylmethane as resource was expected to not only have good compatibility with epoxy resin (EP), but also bring luminescent property to EP composites. It was interesting that the N-CDs-EP composites with 12.5 wt% addition exhibited a limiting oxygen index value of 31.4% and reached UL-94 V-1 grade, indicating a good flame retardancy. Compared with pure EP, the incorporation of N-CDs formed more residual char and had extra smoke suppression effect. Besides, the N-CDs-EP composites exhibited a low transmittance less than 10% for the light wavelength below 490 nm. The N-CDs contributed to the light shielding capabilities of the N-CDs-EP composites, which could effectively shield purple, blue, and cyan light. Furthermore, the mechanical properties including bending strength and impact strength, the dielectric property, and hydrophobicity of N-CDs-EP composites were also improved. The simple but effective modification strategy might be expected to be applied in many polymer systems.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Haiyan Wang,Peizeng Yang,Yiqian Song,Deyang Kong,Junhe Lu
UV-based treatment technologies have been widely applied in wastewater treatment plants due to its high efficiency in deactivating pathogens and degrading organic contaminants. However, this study demonstrates that N -nitrosodimethylamine (NDMA), a probable human carcinogen, can be generated during UV treatment of dimethylamine (DMA) pollutants of concern, for example isoproturon (IPU), in the presence of nitrite (NO 2 – ). Quenching tests have identified that in addition to direct photolysis, hydroxyl radicals (HO • ) and nitrogen oxide radicals (NO • and NO 2 • ) generated from NO 2 – photolysis play a crucial role in the reaction. They can react with IPU, leading to hydroxylated and nitrated products. More importantly, NO 2 • couples with a NO • or another NO 2 • to form N 2 O 3 and N 2 O 4 , respectively. As nitrosating agents, N 2 O 3 and N 2 O 4 directly attack the released DMA during IPU degradation, yielding NDMA. At IPU initial concentration of 50 μM, the highest concentration of NDMA was 5.62 μg/L in 2.5 h by UV/NO 2 – , corresponding to the molar yield of 0.22%. This study further reveals that other dimethylamine compounds, such as diuron, imipramine, and tetracyclines, can also serve as NDMA precursors during UV disinfection with NO 2 – present. Given that many environmental contaminants contain DMA moieties and NO 2 – is ubiquitously present in wastewaters, formation of NDMA during UV disinfection is probably a common but overlooked problem, which deserves emerging concern.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Chang Wu,Lin-Xia Lu,Zong-Xing Wu,Xian-Wei Cheng,Jin-Ping Guan
The versatile modification of silk fabric using a fully biobased approach is intriguing. In this study, phytic acid and vanillin, which are plant extracts, were utilized to synthesize reactive vanillin phytate ester for modifying silk fabric to achieve durable flame retardancy, antibacterial and anti-UV performance. The multifunctional properties, thermal resistance, smoke and heat suppression capacity, flame-retardant durability and mechanism of modified silk fabrics were investigated. The vanillin phytate ester imparted high antimicrobial and UV resistance to silk fabric, achieving a 97 % inhibition rate against Escherichia coli and reaching an “excellent” level of UV protection. The modified silk fabric also possessed the self-extinguishing capacity, with a limiting oxygen index value as high as 33.5 %. There was also a significant reduction of 71.7 % in peak heat release and 40 % in smoke release compared with those of the original silk. After undergoing 20 washing cycles, the modified silk fabrics also self-extinguished and passed the vertical burning test, and such good washing resistance was achieved by the Schiff base cross-linking of vanillin phytate ester on the silk fabric. An intumescent flame-retardant mechanism was also identified by char residue analyses, which was driven by the synergistic charring action of phosphate groups and aromatic structures.
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-9
·
IF 23.2
Dai Xiaokang,Wang Longxiang,Fallatah Ahmed M.,Wang Xing,Almalki Abdulraheem S. A.,Qi Yiyu,Jin Xiaoyu,Yang Shengxiang,Yuan Bingnan
Translucent materials are widely used in indoor lighting, electronic display devices, photovoltaic devices, and other aspects of daily life. Developing materials with high transparency that can effectively manage the transmitted light spectrum is of significant practical importance. This study focuses on constructing a flexible composite film matrix using biomass nanocellulose fibrils (CNF) and polyvinyl alcohol (PVA) as raw materials. Based on the down-conversion luminescence principle, we use carbon nitride nanosheets (CNNs) as the core for light management, filtering UV rays from sunlight while converting them into visible light for light compensation. The transparency test results show that the prepared CNNs@CNF/PVA flexible composite film has a total transmittance of about 90% in the visible light range, with a haze greater than 60%. Three-dimensional fluorescence test results indicate that CNNs@CNF/PVA can convert UV light in the range of 250–375 nm into visible light in the range of 420–550 nm. Simulated outdoor lighting results show that the composite film material performs better than ordinary glass and PMMA in light transmission. This biomass-based flexible film material is expected to have broad applications in indoor lighting, flexible photovoltaic devices, and high-quality fruit and vegetable cultivation.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shan Wang,Youmei Wang,Lu Xiang,Jinqiu Qi,Yongze Jiang,Jiulong Xie
Alkaline lignin and sodium lignosulfonate were chemically modified by using maleic acid for potential application on the production of ultra-flexible gelatin films. The comparison results in morphology and chemical structures of the two types of lignin before and after modification revealed that carboxyl and C C groups were successfully grafted onto the lignin, resulting in the changes in physical-chemical properties. Compared to modified sodium lignosulfonate, modified alkaline lignin (MAL) was much more appropriate in the preparation of gelatin (GEL)/lignin films by endowing the films with transparency and excellent UV light shielding ability. Elongation at break of GEL/MAL films were more than two times that of the pure gelatin film, which greatly addressed the brittleness issues of the pure gelatin films during use, indicating that the modified alkaline lignin could be used as renewable additive with replacement of glycerol. The results in this study also gave evidence that the sources and structure of lignin affect its compatibility with gelatin solution. The higher weight loss rate and lower pyrolysis degradation temperature indicated that the gelatin/lignin films were much more easily thermal degradable at the end of service life. This research provided a potential and efficient approach on the production of renewable and biological films from gelatin and lignin.
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高影响因子
Coatings
·
2017
·Vol. 8
·期 1
·9
·
IF 2.175
Xiaoxing Yan,Xingyu Qian,Rong Lu,Tetsuo Miyakoshi
A waterborne ultraviolet (UV)-curing coating was prepared on the surface of wood materials with modification of talcum powder and calcium carbonate (CaCO3). When the waterborne UV-curing coatings on the surface of wood materials (WUVCW) was radiated for 1 min by UV (λ = 365 nm) and dried at 40 °C for 10 min, it showed good hardness, adhesion, and impact strength, with controlling the talcum content of 2.0% and CaCO3content of 1.0%, respectively. When the content of talcum powder was higher than 2%, the mechanical properties and gloss of the WUVCW decreased, and when the talcum powder of WUVCW increase to more than 5%, a matte surface appeared after curing. When CaCO3and talcum powder were present at the same time, the mechanical properties of WUVCW were better than those of only CaCO3or talcum powder.Keywords:modification;interior waterborne coating;UV;mechanical properties;gloss
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高影响因子
危险品化学品经营许可证（带存储）