PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Xiaomeng Li,Shuxue Zhou
Modification of MXene is usually necessary for their application in corrosion resistant coatings. Nevertheless, the influence of the grafting degree of modifier is not concerned in the past. In this work, modified Ti 3 C 2 nanosheets (G-Ti 3 C 2 ) with different grafting degree of (3-glycidyloxypropyl)trimethoxysilane (GPS) were obtained by changing GPS dosage, and further incorporated into waterborne epoxy resin coatings (WEP). GPS modification led to deteriorated dispersion in water but improved dispersion stability of Ti 3 C 2 nanosheets in waterborne epoxy resin at appropriate GPS-grafting degree presumably due to the interaction between the liquid epoxy resin droplet and G-Ti 3 C 2 nanosheets. The GPS grafting degree was also critical to get the corrosion resistant nanocomposite coatings . The best corrosion resistance, i.e., with impedance modulus four orders of magnitude higher than that of pure WEP after 30 days' immersion in salt solution as well as the lightest corrosion in salt spray test, was achieved using the Ti 3 C 2 nanosheets modified at the GPS-to-Ti 3 C 2 mass ratio of 30:1. Better dispersion of G-Ti 3 C 2 nanosheets and stronger interaction between epoxy resin matrix and G-Ti 3 C 2 nanosheets should be responsible for the excellent corrosion resistance of the coatings at optimum GPS grafting degree.
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
FOOD HYDROCOLLOIDS
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2014
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IF 4.28
Chen Li,Weizhe Zhu,Haoran Xue,Zhiyan Chen,Yajing Chen,Xingguo Wang
Peanut protein isolate (PPI) was glycated with gum Arabic for 3, 6 and 9 days respectively to study the effect of different degree of graft on the physical and structural properties of glycated films. As the glycation continued, the degree of graft of PPI-gum Arabic conjugates increased gradually, the degree of crosslinking between PPI and gum Arabic in films also increased. Compared to PPI films, glycated films had increased tensile strength, decreased water vapor permeability (WVP), but decreased elongation. As the glycation proceeded from 3 to 9 days, the tensile strength of glycated films decreased, the WVP and the elongation increased gradually. This phenomenon may be caused by the decreased crystalline and increased amorphous structure of glycated films with the glycation time, which was confirmed by X-ray diffractometry and scanning electron microscopy. Disulfide bonds were the predominant interactive forces involved in all film networks. The result suggested that as the glycation continued, the level of disulfide bonds in PPI-gum Arabic films reached equilibrium after 6 days glycation.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
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IF 4.1
Dan-Yang Liu,Guo-Peng Zhao,Yi-Di Wang,Jiang-Tao Hu,Xiao-Jing Guo,Xi Yan,Yan Chen,Xuan Zhang,Wan-Zhong Lang
A large amount of soluble beta-cyclodextrin (β-CD) was immobilized on polypropylene non-woven fabric (PP) by radiation and chemical grafting to obtain PP-g-MAH-β-CD, which can effectively adsorb bisphenol A (BPA) in water. A longer chemical chain was grafted by β-CD through the pre-modification, which effectively reduced the steric hindrance of further grafting reaction and made the grafting degree of β-CD on PP fabric higher. In addition, the adsorption mass transfer resistance of fabrics with different grafting degrees was calculated according to non-equilibrium thermodynamics to explore the effect of grafting degree on adsorption. The characterization results confirmed the successful preparation of PP-g-MAH-β-CD. The theoretical maximum saturated adsorption capacity of PP-g-MAH-β-CD was 146.55 mg/g. PP-g-MAH-β-CD was easy to recycle, and the adsorption capacity did not decrease significantly after 15 cycles of adsorption and desorption experiments.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2024
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IF 3.3
Zhi-Wei Guo,Heng-Juan Li,Ning Peng,Ying-Qiu Li,Yan Liang,Yu-Ru Zhao,Cai-Yue Wang,Zi-Yue Wang,Chenying Wang,Xidong Ren
BACKGROUND Pea protein isolate (PPI) is gaining increasing popularity in the food industry. It provides a diverse range of health benefits, such as hypoallergenic and gluten-free characteristics. However, the functional performance of PPI is hindered by its low solubility and poor stability. Therefore, in this article, PPI and dextran (DX) of different molecular weights were grafted to investigate the effects of grafting DX with different molecular weights on the interface properties and antioxidant properties of PPI. Additionally, the stability and digestive properties of the glycated PPI nanoemulsion system were explored. RESULTS The result showed that the grafting degree of PPI–DX conjugates (PPI–DC) decreased with an increase in the molecular weight of DX. Surface hydrophobicity, antioxidant activity and solubility of PPI–DC were significantly improved after grafting compared with PPI and PPI–DX mixtures (PPI–DM). Astaxanthin-loaded emulsions stabilized by grafted conjugates had smaller droplets and higher astaxanthin encapsulation rate compared to PPI emulsions. In vitro digestion demonstrated that the bioavailability of PPI–DC emulsions was higher than of PPI emulsion. Furthermore, after 24 days of storage, retention rate of astaxanthin-loaded emulsions prepared by conjugates remained above 70%, surpassing that of PPI emulsion. CONCLUSION These results indicated that DX grafting can improve the emulsion properties of PPI. In addition, the DX with a molecular weight of 5 kDa showed the most significant improvement. This study contributes to the advancement of natural emulsifiers by modifying PPI through glycation, and furnishes a valuable reference for its utilization in functional foods. © 2024 Society of Chemical Industry.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER TESTING
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2017
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IF 2.464
Jianxi Huang,Haijun Yang,Min Chen,Te Ji,Zhengchi Hou,Minghong Wu
Systematic study of FTIR spectra was carried out on the PES/PVP blends and PES-g-PVP copolymers . In the blends, no shift of carbonyl group absorbance was observed. In the copolymers, there was an occurrence of blue-shift that increases with the grafting degree, which can be used as a compelling evidence of PVP being grafted onto PES . This phenomenon was interpreted from the stereo-hindrance effect. Besides, as the intensity of carbonyl group absorbance increased proportionally with the degree of grafting obtained by elementary analysis, FTIR, a simple and easy tool, became feasible for the quantitative determination of PVP content in the graft copolymers . Calibration curves with high correlation coefficient were established from which the quantitative relationship between the intensity of carbonyl group absorbance normalized by a chosen internal reference and the grafting degree can be obtained.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Hui Zou,Xiancheng Ren,Jing Zhang
In this study, a superior hydrophilic polyvinylidene fluoride (PVDF) membrane with an enhanced monomer grafting ratio was prepared via an ultraviolet (UV) photografting polymerization method. The water contact angle (WCA) of the Bi2O3–acrylic acid (AA)-modified PVDF membrane reduces to 40.4° with the increasing of Bi2O3 content, illustrating significant enhancement of membrane hydrophilicity. Attenuated total reflection Fourier transform infrared spectra and atomic absorption spectroscopy reveal that Bi2O3–AA-modified membranes have more than five times AA grafting degree onto the surface of the hydrophobic PVDF membranes than only the AA-modified membrane. The mechanism of Bi2O3 promoting degree of AA grafting during the polymerization process is also especially explored in this research, and h+ and •O2– are proved to be primary active species in graft polymerization. Unexpectedly, the modified membrane has much better retention performance compared with the neat membrane. In addition, the Bi2O3–AA modified membrane also shows self-cleaning property for degradation dyes on the membrane surface.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Chuxin Ke,Shaoqi Zhang,Xiaoyu Yang,Liang Li
Soybean protein isolate-soluble soybean polysaccharide (SPI-SSPS) complexes and mixtures with varying SPI/SSPS concentration ratios (1: 1, 2:1, 4:1, 8:1) were prepared by Maillard reaction and blending, respectively, and their physicochemical, structure, and functional properties were compared studied. The physical stability of SPI-SSPS complex, which consisted of C N and C S bonds, was better than that of the SPI/SSPS mixture with electrostatic interactions and hydrogen bonds, and both were superior SPI alone. The complex with SPI/SSPS concentration ratio of 8:1 had the highest grafting degree (33.25 %) and a more ordered structure, making its solubility and emulsifying property lower than the SPI/SSPS mixture; however, the physical and thermal stability of the SPI-SSPS complex was higher than that of the SPI and SPI/SSPS mixture. In particular, the SPI-SSPS complex with a high grafting degree showed a higher thermal denaturation temperature (194.06 °C). This study aimed to provide effective modification methods to utilize soybean processing by-products by modifying soybean protein isolate with soluble soybean polysaccharide.
研究领域:
食品科学
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化学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
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2023
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IF 8.1
Siqi Yang,Guofang Zhang,Hong Chu,Peng Du,Aili Li,Libo Liu,Chun Li
The aim of this study was to prepare conjugates of casein (CA) with pectin (CP) or arabinogalactan (AG) by the Maillard reaction (wet-heating) and to investigate the effects of CP or AG on the structural and functional properties of casein. The results indicated that the highest grafting degree of CA with CP or AG was observed at 90 °C for 1.5 h or 1 h, respectively. Secondary structure showed that grafting with CP or AG reduced the α-helix level and increased the random coil level of CA. Glycosylation treatment of CA-CP and CA-AG exhibited lower surface hydrophobicity and higher absolute ζ-potential values, further significantly improving the functional properties of CA (e.g., solubility, foaming property, emulsifying property, thermal stability, and antioxidant activity). Accordingly, our results indicated that it is feasible for CP or AG to improve the functional properties of CA by the Maillard reaction.
研究领域:
食品科学
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化学
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生物技术
✓ 已验证
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）