Coatings
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2022
·Vol. 12
·期 9
·1246
·
IF 3.236
Pan Pan,Xiaoxing Yan,Wenting Zhao
In this paper, photochromic and thermochromic microcapsules were selected. There are three different coating processes: “the primer with the photochromic microcapsules, the topcoat with the thermochromic microcapsules”, “the primer with the thermochromic microcapsules, the topcoat with the photochromic microcapsules”, and “the photochromic and thermochromic microcapsules added into the primer and topcoats” to explore the color-changing effect of the coating on the surface of basswood (Tilia) and the comprehensive properties of the paint film. The optical properties, mechanical properties, cold liquid resistance, and aging resistance of the coating were mainly analyzed. It was concluded that the comprehensive performance of the coating was the best when thermochromic and photochromic microcapsules were mixed on the surface of basswood (Tilia). At a temperature of 80 °C, the color difference reached a maximum of 20.2, and the coating was completely discolored. The color difference of the coating after discoloration under visible light illumination was 56.9. The gloss under the angle of incidence at 60° was 37.4, hardness was 3H, adhesion grade was 1, impact resistance was 10.0 kg·cm, and cold liquid resistance grade was 1. The method of mixing the two microcapsules had better aging resistance. In this paper, the photochromic and thermochromic properties of the coating were studied, and the optimal discoloration of the surface coating of the basswood substrate was solved by different coating processes. This study provided a method for a coating to achieve both photochromic and thermochromic discoloration, broadening the application of discoloration coatings.Keywords:coating process;discoloration;microcapsules;paint film performance
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
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Jianfeng Zhu,Junjie Huang,Jianhong Yang,Jun Cai,Guoxiang Li
Lacquer sap is a precious natural emulsion collected from lac tree, mainly used as a coating. In order to improve its performance and reduce its usage cost, styrene was mixed into raw lacquer sap for modification. Under an oxygen atmosphere, the copolymerization of styrene and urushiol was achieved through the catalysis of laccase contained in the raw lacquer sap. The copolymerization process was characterized by GPC and NMR. To maintain the fluidity of the copolymerized lacquer, styrene couldn't be completely polymerized. Excessive reaction time could lead to explosive polymerization. Thus, controlling reaction time was particularly important. The copolymerized lacquer had a shorter drying time than the raw lacquer sap. The results from NMR, FT-IR, pyrolysis GC–MS and UV–Vis spectra showed that styrene had successfully polymerized into the dry lacquer film. Due to the introduction of styrene, the color of the lacquer film changed from dark brown to light yellow, and its pencil hardness and flexibility were improved, reaching 5H and 2 mm, respectively, while maintaining its excellent resistance to organic solvents. In addition, the thermal stability of the lacquer film was improved as well.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2020
·
IF 0
Huihui Zhao,Linyan Yang,Xueming Chen,Lankun Cai,Yejin Li,Mei Sheng,Guomin Cao,Qianhong She
The co-presence of haloacetic acids (HAAs) and Mg2+ in swimming pool waters and the potential interaction among Mg2+, HAAs, and membranes prompted a systematic investigation of membrane performance affected by Mg2+. The rejection behavior of the tight NF90 was not significantly affected by Mg2+ due to the predominant role of size exclusion. For loose NF270, HAA rejection and water flux were reduced by 27% and 12%, respectively, after the addition of 5 mM Mg2+. The notable magnesium content in NF270 exposed in Mg2+ indicated the binding of Mg2+ to membranes. The interaction between Mg2+ and membranes resulted in a less negatively charged and hydrophilic surface and a smaller effective pore radius for membranes. The reduction of the effective pore size by Mg2+ was verified as a result of competing effects between “-COO–-induced conformational change” and “cation-induced pore shielding”. The increased permeability for charged HAAs and NaCl in the presence of Mg2+ was mainly attributed to charge neutralization, while the reduced permeability for neutral surrogates and water was due to the reduced effective pore size and hydrophilicity. The underlying mechanism for resolving the interaction among different divalent cations, trace contaminants, and polyamide membranes may have significant implications for practical water purification by membrane technologies.
研究领域:
环境科学
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膜技术
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水处理工程
✓ 已验证
产品关联
DOI
Food Packaging and Shelf Life
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2024
·
IF 8.5
Huiyuan Zheng,Wanqing Deng,Bifen Zhu,Yun Deng,Danfeng Wang,Yu Zhong
In present study, the interaction between Tween20 and Span20, and its effects on bulk-phase property of gelatin solution and film performance produced by casting (CA) or electrostatic spraying (ES) were studied. Isothermal titration calorimetry and fluorescence probe spectrum indicated that Tween20 and Span20 were preferentially combined in solution and synergistically influenced the polarity and wettability. Surfactant aggregation in the resulted film became smaller and more uniform as the proportion of Tween20 increased with average distribution diameter decreasing about 93%, while water sensitivity of the film enhanced by nearly 40%. Correlation analysis further verified that the polarity of the gelatin solution could affect the water vapor permeability, elongation at break and transmittance of the film. The comprehensive performance of coating system was the best at Tween20/Span20 of 1:1, which also had the best preservation effect. ES produced film with better performance than CA, and would be a promisingly edible coating technology.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Yankun Li,Wenbo Luan,Peichen Yuan,Guanzhou Zhen,An Xing,Haitao Wu,Longhai Guo,Xiaoyu Li,Jun Ye,Teng Qiu
Bio-based bisphenols from Hou Po ( Cortex Magnoliae Officinalis, one of the popularly used herb in traditional Chinese medicine) was applied as a new kind of the chain extender for the synthesis of cationic waterborne polyurethane (CWPU). Since the representative Hou Po -bisphenols include magnolol (MAG), honokiol (HON) and Magnolia officinalis extract (MPE), to explore their subtle structure effects and distinguish them from their petrochemical analogs of bisphenol A (BPA) and 2,2′-biphenol (OBP), the CWPU modified by different bisphenols were systematically characterized and compared. It has been found that the copolymerization of MAG onto the backbone of CWPU can give out superior film toughness, damping factors and self-healing efficiency (>90%). The elastic film recovered from the cut-off damage exhibited the tensile strength of 41.5 MPa and the elongation at break of 940%. On the contrary, MPE modified CWPU exhibited remarkable reinforcement effect on the CWPU films, and the tensile strength reached ~50 MPa but with the sacrificed reversibility. The enhanced thermal stability and surface hydrophobicity were also pronounced on the MPE modified CWPU. The very different roles of the Hou Po- bisphenols are in sharply distinctive from their petrochemical analogs, providing new insights into the design of biologically sourced materials. Graphical
研究领域:
材料科学
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生物基材料
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高分子化学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 89
·73068-73076
·
IF 3.84
Lifang Zhu,Hongwei Yu,Huijuan Zhang,Jiangnan Shen,Lixin Xue,Congjie Gao,Bart van der Bruggen
Aromatic poly(m-phenyleneisophthalamide) (PMIA) and the metal-organic framework (MOF) MIL-53(Al) were employed as the polymer matrix and additive, respectively, to develop mixed matrix membranes (MMMs) via non-solvent induced phase separation for potential application in organic solvent nanofiltration. The prepared membranes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and water contact angle measurements. The membrane water permeance enhanced when MIL-53(Al) was incorporated into the membrane structure while the rejection had no significant change. The optimum MMM (with 0.5 wt% MOF concentration) passes mono and bivalent inorganic salts but rejects larger charged organic molecules and has a mean effective pore size of 0.7 nm. The influence of organic solvents on MMM performance was also investigated and the result shows that the performance shifts towards a lower pure water permeance and a higher rejection after exposure to organic solvents (ethyl acetate or methanol). The membrane performance in organic solvent nanofiltration was evaluated on the basis of the permeance and rejection of brilliant blue G in ethanol, and the result showed that the permeance of MMMs significantly increased (by 289%) while the rejection slightly reduced by 4% in contrast to the pure membrane.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2016
·
IF 5.267
Xiangju Song,Li Wang,Lili Mao,Zhining Wang
We investigated the effect of carbon nanotubes (CNTs) location on the property and performance of prepared membranes. Four different types of membranes were prepared, including (1) thin film composite (TFC, polyamide active layer on polysulfone substrate), (2) nanocomposite-supported thin film composite (nTFC, polyamide active layer on CNT-embedded polysulfone substrate), (3) thin film nanocomposite (TFN, CNT-incorporated polyamide active layer on polysulfone substrate), and (4) nanocomposite-supported thin film nanocomposite (nTFN, CNT-incorporated polyamide active layer on CNT-embedded polysulfone substrate). The water permeability followed the sequence of nTFN > TFN > nTFC > TFC. However, the rejection and salt permeability exhibited the opposite trend. The incompatibility between CNTs and polymers provided nanocorridors, through which both water and solutes could pass. The nTFN membrane exhibited the highest porosity and lowest structural parameter. Moreover, the nTFN membrane possessed the best antifouling capacity by preventing foulants to attach to the surface and clog the substrate pores. This work offered some systematic knowledge to design novel membranes with improved performance for desalination and water purification applications.
研究领域:
材料科学
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环境工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 32
·
IF 1.866
Hao-Cheng Yang,Ming-Bang Wu,Yong-Jiu Li,Yi-Fu Chen,Ling-Shu Wan,Zhi-Kang Xu
Mussel-inspired chemistry has attracted widespread interest in the surface modification of polymer membranes. We have previously demonstrated a dopamine (DA) assisted codeposition process of polyethyleneimine onto polypropylene microfiltration membranes (PPMMs) for surface hydrophilization. In this work, we further investigate the effects of PEI molecular weight and DA/PEI mass ratio on the codeposition process and membrane performance. The results indicate that only low-molecular-weight PEI bring a distinct promotion in both surface wettability and water permeation flux for PPMMs. On the other hand, either excess DA or PEI is detrimental to the surface hydrophilicity of the studied membranes. The optimized PEI molecular weight is 600 Da and the corresponding mass ratio is 1:1 for the surface hydrophilization of PPMMs. These results are beneficial to understand those codeposition processes of dopamine with other polymers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43792.
研究领域:
材料科学
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化学工程
·
生物仿生学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yuanyuan Yu,Zhan Lv,Shanshan Zhao,Le Han,Liang Shen,Zhongbo Zhou
Graphene oxide (GO) nanosheets are widely used for fabricating high-performance membranes due to self-assembled nanoscale/subnanoscale two-dimensional (2D) channels; however, the influence of GO physicochemical properties on the transport channels and desalination performance of GO membranes is not yet systematically investigated. Herein, GO membranes with different channel architectures and functional groups are prepared via ultrasonic and in situ thermal reduction methods. The 2D Fourier-transform infrared correlational spectroscopy analysis provides new insights into the dynamics of functional groups on GO nanosheets, and the quartz crystal microbalance with dissipation analysis further confirms the stability of smaller GO sheet (S-GO) membranes. The reduced S-GO (S-rGO) membrane has 86 % and 58 % rejection rates for 50 and 500 mM Na 2 SO 4 , respectively, and 97 % and 94 % for the methylene blue and orange II, respectively. The superior swelling resistance and elevated salt rejection is attributed to the GO nanosheets having a paucity of oxygen-containing functional groups and thus narrower interlayer spacing. A significant positive correlation is found between –COOH and GO membrane surface electronegativity, and between C–O–C and membrane hydrophilicity. A significant negative correlation is observed between the C/O ratio of the GO nanosheets and GO wet interlayer spacing, i.e., the fewer the oxygen-containing groups, the stronger the size-screening ability and swelling resistance of the GO membranes. Overall, GO separation layers with hydrophilic surfaces and weakly hydrophilic interior, could be designed so as to simultaneously enhance the permselectivity and swelling resistance of the GO membranes, which provides a roadmap for the development of high-performance GO membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jincheng Ding,Huiqing Wu,Peiyi Wu
A mussel-inspired sulfonated dopamine (SDA) was synthesized and used as an aqueous monomer to cross-link with trimesoyl chloride (TMC) via interfacial polymerization to prepare nanofiltration membranes . The sulfonic acid groups of SDA were credited with the enhancement of membrane performance , as a result of restraining the process of interfacial polymerization and oxidative-polymerization. Moreover, it also endowed these nanofiltration membranes with more hydrophilic , negatively-charged and smoother surfaces. The optimized nanofiltration membranes (NF-SDA-0.1) exhibited a water flux as high as 62.2 L∙m −2 ∙h −1 (0.6 MPa), while maintained applicable salt rejection of Na 2 SO 4 (~90.0%) and dye rejections of Congo red, Methyl blue, Methylene blue and Brilliant green (all > 99.9%). Thus, the sulfonated dopamine was considered as a promising candidate as aqueous phase monomer for the preparation of high-performance nanofiltration membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2020
·Vol. 17
·期 5
·1377-1387
·
IF 1.815
Peng Xiaoxiao,Liu Yan,Xin Binjie,Guo Hengyi,Yu Yunge
Intended for preparing silane-modified waterborne polyurethane dispersions and then applying them to the development of environmentally friendly nail enamels, the synthesis mechanism was investigated in this paper to determine the optimal technological parameters. Aimed at the synthesis of waterborne polyurethane dispersions, a one-step method was conducted on the prepolymers and the main raw materials, isophorone diisocyanate (IPDI), polycaprolactone diol (PCL), 1,4-butanediol (BDO), 2,2-dimethylol butyric acid (DMBA), (3-aminopropyl) triethoxysilane (APTES), triethylamine (TEA) and solvent water, were adopted. Subsequently, the water-based nail enamel together with its dry film was prepared by pigments and functional additives. Morphological characteristics and chemical composition of dry film of nail enamel were characterized by using atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). The crystallinity of film was analyzed by an X-ray diffractometer (XRD). Benefiting from a thermogravimetric analyzer (TG) and differential thermal analyzer (DSC), the thermal properties of the prepared film were characterized. The hardness, adhesion, glossiness, water absorption, drying time and some other indicators of the water-based nail enamel were tested using a loading pencil hardness tester and other equipment. The experimental results showed the waterborne polyurethane modified by silane coupling agent exhibited favorable film-forming property, glossiness, flexibility, hardness, and adhesion and can be used for developing the environmentally friendly water-based nail enamel with a concentration of silane coupling agent of 1.5%, showing a broad market prospect in the cosmetics field.
研究领域:
材料科学
·
化妆品化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7791-7803
·
IF 4.682
Ma Yanli,Wu Hailiang,Shen Yanqin
We herein report novel POSS-containing linear and star multi-arm organic–inorganic hybrid block copolymers (BCPs) L/S -(PGMA- b -PMAPOSS) 1,2,4,6 synthesized by the core-first ATRP method. Following, crosslinking of the BCPs conducted by the reaction of the glycidyl groups in the PGMA block in the presence of trimethylamine to form the 3-dimensional network and the crosslinking cured BCPs were used for the subsequent properties characterization. Based on the chemical structures being confirmed, the self-assembly behaviors in the aqueous solution and film surface property were investigated in detail. The results showed that linear L -(PGMA- b -PMAPOSS) 2 formed typical core–shell spherical micelles where the hydrophobic PMAPOSS blocks as the core and PGMA blocks as the shell. With the increasing number of arms of the hybrid BCPs, the aggregates were tuned from spherical micelles to dendritic cylinders. Besides, with the increases in the solubility of the solvent, the aggregates tended to form the spherical morphology. The hydrophobic property of the hybrid BCPs film improved gradually from linear monobrachial BCPs to star six-arm BCPs. The thermostability of the hybrid BCPs showed similar results owing to the similar MAPOSS proportion. For the adhesive performance to the glass substrate, S -(PGMA- b -PMAPOSS) 6 possessed the best adhesive strength due to the highest density of branches. Graphical abstract
The novel dual-functional linear and star POSS-containing organic-inorganic hybrid block copolymers (BCPs) L/S -(PGMA- b -PMAPOSS) 1,2,4,6 were successfully synthesized by the core-first ATRP method, then crosslinking the BCPs in the presence of trimethylamine to form the 3-dimensional network. And the self-assembly behavior in aqueous solution was studied in detail, as shown in the graphic image. In addition, the surface property, thermostability and adhesive performance were analyzed.
研究领域:
材料科学
·
化学
✓ 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）