- Development of photoactivable glycerol-based coatings containing quercetin for antibacterial applications
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The development of new antibacterial coatings (against Escherichia coli and Staphylococcus aureus) using a natural dye, quercetin, according to a green chemistry process was investigated. Quercetin was used as both a photosensitizer and antibacterial agent. The synthesized material was developed according to a cationic photopolymerization process under light irradiation. The photosensitizing mechanism involving quercetin and an iodonium-based cationic photoinitiator was described for the first time according to steady state photolysis and fluorescence experiments. The resulting coatings showed excellent adhesion on a stainless steel plate as demonstrated by nanoindentation and scratch tests, with a high thermal stability up to 375 °C. Finally, a primary investigation was conducted to assess the antibacterial properties of the glycerol-derived coatings against Escherichia coli and Staphylococcus aureus under light illumination. Electron paramagnetic resonance spectroscopy confirmed the generation of reactive oxygen species, such as singlet oxygen, which is responsible for inhibiting bacteria proliferation.
- Condat, Michael,Babinot, Julien,Tomane, Somia,Malval, Jean-Pierre,Kang, Inn-Kyu,Spillebout, Faustine,Mazeran, Pierre-Emmanuel,Lalevée, Jacques,Andalloussi, Samir Abbad,Versace, Davy-Louis
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- Study on the synthesis and surface active properties of a novel surfactant with triple quaternary ammonium groups and triple dodecyl chains derived from glycerin
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The new triple chain surfactant was firstly prepared by ring-opening and a quaternization reaction with 2-(chloromethyl)-oxirane, tertiary amine and propane-1,2, 3-triol as starting materials. The surfactant was characterized by MS and elementary analysis. Air-Liquid surface tension was measured by using a tensiometer at temperatures from 298 to 318 K respectively and in various salt solutions (NaX). The results show that with the increase of temperature, the values of critical micelle concentration (cmc) can achieve a minimum at 308 K. The maximum surface adsorption capacity τ decreases, while the minimum molecule Amin area increases. With the increase in temperature and the decrease in counterionic diameter, the values of cmc decrease from 8.09 9 10-5 to 5.52 9 10-5 mol/L, and the adsorption capacity τ increase from 1.80×10-10 to 2.74×10-10 mol/m2, while there are almost no influences to surface tension (γcmc). The free energy of micelle formation is negative (-85.2 to -92.0 kJ/mol). AOCS 2010.
- Xu, Hujun,Chen, Dandan,Cui, Zhenggang
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- Synthesis and characterization of novel surfactants 1,2,3-tri(2- oxypropylsulfonate-3-alkylether-propoxy) propanes
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A series of trimeric sulfonate surfactants 1,2,3-tri(2-oxypropylsulfonate- 3-alkylether-propoxy) propanes were prepared by the reaction of glycerin triglycidyl ether with long-chain alcohols, followed by sulfonation with 1,3-propane sultone. Glycerin triglycidyl ether was synthesized by the reaction of epichlorohydrin with glycerin. The chemical structures of the prepared compounds were confirmed by FTIR, 1H NMR and element analysis. Their solution properties were characterized by use of the method of equilibrium and dynamic surface tension, steady-state fluorescence spectroscopy of pyrene and fluorescence quenching. With the increasing length of the carbon chain, the values of their CMC initially decreased. All these trimeric sulfonate surfactants had good water solubility. These compounds were superior in surface active properties to the reference surfactant SDS. The efficiency of adsorption at the water/air interface (pC20) of these surfactants was very high. It is found that the shorter hydrocarbon chain length of the trimeric sulfonate surfactants, the faster the rate of decrease of surface tension, and the bigger the aggregation number of the trimeric sulfonate surfactants.
- Zhou, Ming,Zhao, Jinzhou,Wang, Xu,Jing, Jiaqiang,Zhou, Lizhi
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- A coating of anti-agent and its preparation method and application
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The present invention discloses an environment-friendly and excellent-performance coating material water repellent agent, which is an aqueous solution containing a multi-epoxy functional group resin, wherein the multi-epoxy functional group resin is a compound having the structure represented by a formula I. The present invention further provides a coating material water repellent agent preparation method with characteristics of easy performing, easy operation and easy control, wherein the preparation method comprises: carrying out a reaction of glycerol, concentrated sulfuric acid and epichlorohydrin for 60-90 min to obtain a first material solution, adding a strong base to the first material solution, reacting to obtain a second material solution, adjusting the pH value with an acid to 6-8, adding ammonia water to the material solution, reacting, and carrying out a post-treatment to obtain the aqueous solution containing the multi-epoxy functional group resin, wherein the aqueous solution is the coating material water repellent agent. The formula I is defined in the instruction.
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Paragraph 0028; 0029
(2017/05/12)
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- Polyether-polyol compound
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A polyether-polyol compound represented by the compositional formula C3nH6n+2O2n+1, wherein n is an integer of 4 or more, wherein the polyether-polyol compound has a total number of 1,2-diol unit and 1,3-diol unit of [(n/2)+1] in a case where n is an even number of 4 or more, or a total number of 1,2-diol unit and 1,3-diol unit of [((n?1)/2)+1] and one hydroxyl group which is not involved in the units in a case where n is an odd number of 5 or more; a polyglycerol alkyl ether, a part of hydroxyl groups in a polyglycerol being substituted by an alkyl group, wherein the polyglycerol is the polyether polyol compound mentioned above; and an ester prepared by the process comprising reacting the polyether-polyol compound mentioned above or the polyglycerol alkyl ether mentioned above with a fatty acid.
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Page column 15-16
(2008/06/13)
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- Amid group-containing diisocyanates and amide group-containing epoxy resins
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An amide group-containing epoxy resin obtained by reacting an epoxy resin with an amide group-containing diisocyanate obtained by reacting a diisocyanate with a dicarboxylic acid gives a uniform cured article showing high adhesiveness and is usable as an adhesive, a coating composition, and the like.
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