PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Lin Deng,Liuyan Tang,Jinqing Qu
The design and development of macro-photoinitiators applicable to UV system has been attracted increasing attention for their excellent performance of low migration and high compatibility. Herein, four kinds of novel macro-photoinitiators (PI1-PI4) used in UV-curable coatings were synthesized by different isocyanates, 1-hydroxycyclohexyl phenyl ketone (Irgacure 184), 2-hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PETA). The structures were analyzed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Moreover, the photopolymerization kinetics of the macro-photoinitiators were investigated by real-time FTIR. Results revealed that the macro-photoinitiators display higher curing efficiency, lower migration performance and better compatibility with formulation compositions compared to Irgacure 184. On the other hand, the macro-photoinitiators also served as self-initiating oligomers and had good thermal stability with 10 % weight loss temperatures (T10 %) above 299.7 °C. The UV-cured films consisting of oligomers and tripropylene glycol diacrylate (TPGDA) showed excellent physical properties and high curing efficiency and rapid curing rate.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
AICHE JOURNAL
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2019
·Vol. 66
·期 2
·e16841
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IF 3.463
Chong Shen,Minjing Shang,Hong Zhang,Yuanhai Su
In this work, we report a simple and inexpensive UV-LEDs based photomicroreactor assembly constructed by commercially available components. The photoisomerization of norbornadiene to quadricyclane was selected to validate this novel photomicroreactor design. Mass transport limitation was eliminated and indicated by dimensionless numbers Fo and Da II , and photons loss was evaluated considering the absorption and reflection of the microreactor walls. The solvents, photosensitizers, and light sources selections were optimized for achieving better photochemical performance and mechanistic insights. The detailed comparison between the high-pressure mercury arc lamp and the UV-LEDs strip revealed great potential of UV-LEDs as appealing light source for photochemical transformations. Moreover, the reaction mechanism was thoroughly discussed and illustrated by the Jablonski diagram indicating electronic states transitions. According to possible intermediate steps, a kinetic model was proposed with the reaction rate constant being correlated with the photon flux, which is valuable for process optimization and further understanding reaction mechanisms.
研究领域:
化学工程
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光化学
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反应动力学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
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IF 3.927
Xiaozeng Miao,Huiwang Dai,Jianxin Chen,Jianxi Zhu
An enhanced method of hydroxyl radical generation was studied to lead a better understanding of the catalytic mechanism of α-FeOOH in UV-Fenton system. The catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption isotherms and scanning electron microscope. The Orange II degradation and hydroxyl radical concentration under different conditions were studied in detail. The results showed that the hydroxyl radical was mainly oxidizing species for Orange II degradation. And the hydroxyl radical generation included both homogeneous and heterogeneous UV-Fenton processes. In heterogeneous UV-Fenton system, the additional oxalate could increase the ratio of homogeneous UV-Fenton process for hydroxyl radical generation. In oxalate enhanced system, the peak value of hydroxyl radical concentration would increase to 11.314 μmol/L which was nearly twice as it in heterogeneous UV-Fenton system (5.978 μmol/L). The k values of Orange II discoloration and mineralization increased to 0.386 min −1 and 0.044 min −1 , which were 1.169 and 0.692 times as that in heterogeneous UV-Fenton system (0.178 min −1 and 0.026 min −1 ). After treatment, the total iron ions concentration decreased to 2.357 μmol/L in oxalate enhanced system. The results indicated that additional oxalate was a promising enhanced method for hydroxyl radical generation in heterogeneous UV-Fenton system with α-FeOOH as catalyst.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2025
·
IF 6.2
Xu Dong,Longxue Gao,Tianyuan Xiao,Jian Zhang,Qingwei Ping
Environmentally sustainable, non-toxic, and harmless multifunctional cotton fabrics, which are endowed with antioxidant and UV-resistant properties, exhibit considerable potential for applications in food protection and packaging. Consequently, there is an imperative need for the advancement of novel coating systems that can endow cotton fabrics with supplementary functional properties. Bamboo ethanol lignin (EL) was synthesized using a clean ethanol pulping process, and a multifunctional coating of EL was fabricated through a one-pot dipping method. In brief, EL interacts with cotton fibers via hydrogen bonding and physical adhesion, and the optimized sample, designated as Cotton@EL 1 , demonstrates outstanding antioxidant and UV-blocking properties. Compared to EL 0 , EL 1 exhibited a substantially higher antioxidant efficiency of 80.3 % and effectively blocked both UVA (99.99 %) and UVB (100 %) radiation. Furthermore, Cotton@EL 1 exhibited a UPF value of 48.2, with UV transmittance below 3 %, showcasing exceptional UV protection performance. In conclusion, this study presents a novel approach for the utilization of high-value wood materials in the development of environmentally sustainable, non-toxic, and multifunctional food protection and packaging fabrics.
研究领域:
材料科学
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纺织工程
·
环境科学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Wenhao Liu,Chuanshuang Hu,Weiwei Zhang,Zhonghui Liu,Jianping Shu,Jin Gu
UV digital inkjet printing has become a popular surface decoration method for wood-based furniture due to its high efficiency and environmental friendliness. However, the bonding interface between the UV coating and wood surface is weak and results in poor printing durability. In this study, birch wood surfaces were treated with three silane coupling agents, namely γ-methacryloxypropyl trimethoxy silane (KH570), triethoxy vinyl silane (KH151) and 3-glycidyloxypropyl trimethoxy silane (KH560), to improve surface bonding efficiency with UV coating. After saline treatments, the water contact angle of the wood substrates increased from 58° to greater than 100°. The bonding strengths between the UV coating and wood surface treated with 200 g/m 2 KH570, KH151 and KH560 were enhanced to 5.91 MPa, 5.42 MPa and 1.88 MPa, respectively, comparing with the untreated sample of 1.3 MPa. FTIR results indicated that all silane coupling agents could be grafted onto the wood fibers at the substrate surface and KH570 was able to participate in UV curing process. SEM imaging showed that a layer of KH570 was tightly attached to the wood substrate surface and seamlessly connected to the UV coating, thus the adhesion of UV ink was greatly improved.
研究领域:
木材科学
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表面化学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Shuhui Sun,Shu Wang,Yuxuan Ye,Bingcai Pan
Considerable amount of phosphorous is present as organic phosphonates (usually in the form of metal complexes, e.g., Ca(II)-phosphonate) in domestic and industrial effluents , which cannot be effectively removed by traditional processes for phosphate. Herein, we employed a proprietary process, i.e., Fe(III) displacement/UV irradiation/co-precipitation (denoted Fe(III)/UV/NaOH), to enable an efficient removal of Ca(II)-phosphonate complexes from water. The combined process includes three basic steps, i.e., Fe(III) replacement with the complexed Ca(II) to form Fe(III)-phosphonate of high photo-reactivity, UV-mediated degradation of Fe(III)-phosphonate to form phosphate and other intermediates, and the final phosphorous removal via co-precipitation at pH = 6. The operational conditions for the combined process to remove a typical phosphonate Ca(II)-NTMP (nitrilotrismethylenephosphonate) are optimized, where ∼60% NTMP is transformed to phosphate with the total phosphorous reduction from 1.81 mg/L to 0.17 mg/L. Under UV irradiation, the cleavage of NTMP is identified at the C-N and C-P bonds to form the intermediate products and phosphate in sequence. Also, the combined process is employed for treatment of two authentic effluents before and after activated sludge treatment, resulting in the phosphorous drop from 4.3 mg/L to 0.23 mg/L and from 0.90 mg/L to 0.14 mg/L respectively, which is much superior to other processes including Fenton/co-precipitation. In general, the combined process exhibits great potential for efficient removal of phosphonates from contaminated waters .
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
Materials Today Sustainability
·
2023
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IF 7.8
Cheng-Min Hou,Wei-Min Yan,Tian Liu
At present, the silver nanorods of UV conductive ink have the problems of easy agglomeration of silver nanorods , and slow curing speed. In this paper, firstly mace-like silver nanorods with inorganic particles were synthesized by using polycarbonate fibers as soft-templates, AgNO 3 as silver source. The diameters and lengths of silver nanorods were 0.25–0.35 μm and 2.1–5.1 μm. There are many wolf-tooth particles (0.20–0.35 μm) on the silver nanorods which prevented the silver nanorods from reuniting. The obtained silver nanorods were not easy to agglomerate. The minimum resistance value of the coating could reach 1∼10Ω. Secondly, a kind of water-alcohol UV conductive ink with low heat treatment temperature (140 °C), fast drying and curing speed and water-alcohol system was prepared. Water-alcohol soluble P(AA- r -HEMA)- g -GMA was used as the prepolymer , glycidyl triethylenetetraamine hexamethacrylate (TGMA) was used as the monomer , and 907 and ITX were used as photoinitiators. The effects of the types and contents of different photoinitiators (907:1%–5%, ITX: 0.2 %∼1 %), species and contents of prepolymer (30 %∼50 %), the number and content of monomers with different functional groups (30 %∼50 %) on the UV-curing rate were studied. The curing rate was the fastest when the mass fraction of photoinitiator ITX was 0.4 %, the mass fraction of the prepolymer with 30 % GMA content was 50 % and the mass fraction of monomer TGMA was 50 %. The curing speed can reach 2–3 s, and the ink film surface was smooth without bubbles. At last, UV conductive ink was prepared by using the obtained water-alcohol UV curing system as the bonding material and mace-like silver nanorods as the conductive filler . The influence of heat treatment temperature and time on the conductive properties of the coating was explored. The optimal heat treatment temperature was 140 °C, and the heat treatment time was 30 min.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 14
·47310
·
IF 1.901
Xiaoyong Zhang,Jinmei He,Lipei Yue,Yongping Bai,Huihui Liu
The development of adhesive tapes that can be applied at high temperature is a major challenge for pressure-sensitive adhesives (PSAs). To date, the heat resistance of PSAs has not been investigated in sufficient details. In this study, based on the relationship between curing structures and properties, a series of acrylic PSAs with excellent heat resistance were prepared. Commercial zirconium acetylacetonate (ZrACA), desmodur L75 (L75), and N , N , N ′, N ′-tetrakis(2,3-epoxypropyl)- m -xylene-α,α′-diamine (GA240) were employed as heat-curing agents. Trimethylolpropane triacrylate (TMPTA) was used as ultraviolet (UV)-curing agent to form semi-interpenetration polymer network structures after UV exposure. The influences of different curing agents on the thermal stability, adhesion performance, gel fraction, and viscoelastic of PSAs were explored. The results showed that the PSAs cured by L75, GA240, and TMPTA exhibited excellent heat resistance. Especially, when the content of L75 was 1.0 wt %, the PSAs could be peeled off substrate without residues on substrate surface after treatment at 170 °C for 4 h, while the nonmodified acrylic PSAs possessed residues after treatment from 110 °C. The cured PSAs adhesive performance was evaluated showing maximum 180° peel strength of 16.7 N/25 mm comparable to current PSAs. These resulting PSAs showed high heat resistance and they are suitable for a broad range of special fields. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47310.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shuangshuang Wang,Yonghang Yu,Chen Zhou,Shengyang Yang
This study addresses the challenges of mass production and extensive application of superhydrophobic coatings, focusing on adhesion and durability. We propose an innovative solution utilizing screen printing and UV curing techniques, offering a simple, replicable, and scalable process. Our two-step strategy involves applying a polyurethane diacrylate (PUA-2) adhesion layer to the glass surface through screen printing and UV curing to ensure superior adhesion. Next, a polyurethane hexaacrylate (PUA-6) based formulation is applied over the adhesion layer and subjected to light curing, resulting in excellent hydrophobicity, scratch resistance, and corrosion resistance. This method withstands a pullout force exceeding 5 MPa, achieving a water contact angle of 164.3° and a sliding angle of 1.6°. The coating maintains favorable superhydrophobicity after 80 rounds of sandpaper friction and demonstrates promising corrosion resistance in a 3.5 % NaCl solution. Notably, this approach streamlines large-scale production and delivers exceptional, well-defined performance, providing a promising avenue for widespread and sustainable applications of superhydrophobic coatings.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 12
·3005
·
IF 3.426
Yunxin Fan,Yan Song,Na He,Fei Cheng,Xiaojiao Jiao,Guoqiao Lai,Xilin Hua,Xiongfa Yang
A kind of hyperbranched silicone containing macrophotoinitiators (HBSMIs) were synthesized from 2-hydroxy-2-methyl-1-phenyl propanone (HMPP) and the UV-curing behaviors of HBSMIs were investigated in UV-cured transparent polyurethane-acrylate (PUA) coatings. HBSMIs show higher UV-initiating efficiency than HMPP. The migration of HBSMIs from the UV-cured coatings can be as low as 1.7–6.0 wt%, which is obviously lower than the migration of HMPP. There is a remarkable improvement of the tensile strength of the UV-cured materials initiated by HBSMI in comparison to that of the materials prepared with the same PUA initiated by HMPP. Especially for the UV-cured materials prepared from PUA with 20 wt% 1,1,1-tris(hydroxymethyl)propane (TMP), the tensile strength and the strain at break increased from 6.81 MPa to 12.14 MPa and from 43.0% to 71.9%, respectively. The fraction of improvement for the tensile strength and the strain at break is as high as 78.9% and 67.2%, respectively. The coatings prepared with HBSMI also have better UV resistance ability than those coatings prepared with HMPP because they turn slightly yellow when they are aged by UV for about 15 min while the coating prepared with 4 wt% of HMPP will turn yellow only aged by UV for 2 min. These results suggest that preparation hyperbranched silicone containing macrophotoinitiators will be one of the good strategies to improve the curing efficiency of the UV-curing system, reduce the migration of UV initiator from cured material, improve the mechanical and UV resistance performance of UV-cured materials.Keywords:UV-cured coating;hyperbranched silicone containing macrophotoinitiators;migration;the tensile strength
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Jia Deng,Guangxue Wu,Shoujun Yuan,Xinmin Zhan,Wei Wang,Zhen-Hu Hu
Ciprofloxacin (CIP) is a widely used third generation fluoroquinolone antibiotics, and has been often detected in wastewater treatment plants. Finding an effective way to remove them from wastewater is of great concern. Ultraviolet (UV)/chlorine advanced oxidation process (AOP) has many advantages in micropollutant removal. In this study, CIP degradation in UV/chlorine process was investigated. Only 41.2% of CIP was degraded by UV photolysis and 30.5% by dark chlorination in 30 min, while 98.5% of CIP was degraded by UV/chlorine process in 9 min. HCO 3 − had markedly inhibition, NO 3 − and SO 4 2- had slight inhibition, and Cl − had a marginal inhibition on CIP degradation in UV/chlorine system. The degradation of CIP in UV/chlorine process was mainly attributed to the attack of reactive species. The relative contributions of hydrated electrons (e aq ), hydroxyl radicals (HO ), chlorine atoms (Cl ), and UV photolysis were investigated. Under neutral condition in aqueous solution, CIP degradation had highest pseudo first-order reaction rate constant, in which e aq had the highest contribution, followed by Cl , HO , and UV photolysis. The intermediates and byproducts were identified and the degradation pathway was proposed. The total organic chlorine (TOCl) and biotoxicity were further assessed. CIP and natural organic matters (NOMs) were removed efficiently in real water. UV/chlorine showed the potential for the wastewater treatment containing CIP.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yanting Liu,Xiaochun Li,Hongjun Luo,Rui Huang,Xuewan Wu,Lei Tan,Jialiang Guo,Kaisong Yuan
We developed a three-dimensional (3D)-metal-printed ultraviolet (UV) detector with an aluminum alloy housing that allows it to withstand low-polarity organic solvents. The detector can be attached to the lower end of an open chromatography column to realize real-time monitoring of the separated and eluted colorless fractions. Open column chromatography is commonly used for the separation and purification of mixtures. However, open column chromatography is never coupled with UV detectors. In the context of open chromatography column experiments, thin-layer chromatography (TLC) is typically employed for the qualitative analysis of separated products. Nevertheless, this approach is both cumbersome and time-consuming. Therefore, to reduce workload and save time, we developed a 3D-metal-printed UV detector, which exhibits good stability and linearity (R 2 > 0.99). The feasibility of real-time monitoring using this 3D-metal-printed UV detector was verified by subjecting the mixture to separation and monitoring. On elution of a substance exhibiting light-absorbing properties, a decrease in voltage is observed. At this point, the collection of the fractions may be initiated to achieve the effect of substance tracking. The utilization of the 3D-metal-printed UV detector for real-time monitoring enables the elimination of the time previously spent on the collection of all fractions and the subsequent determination of whether the fractions contain the substance by TLC. It is also capable of determining the separation effect of the mixture based on the curve monitored in real time. Moreover, the device can modify the dimensions of the interface, thereby facilitating its utilization in conjunction with high-performance liquid chromatography (HPLC) for the real-time monitoring of the separation effect of the column. The device is characterized by low cost and small size.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）