- Polyoxyethylene ether carboxylic acid dimeric surfactant type drag reducer as well as preparation method and application thereof
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The invention discloses a polyoxyethylene ether carboxylic acid dimeric surfactant type drag reducer as well as a preparation method and application thereof. The polyoxyethylene ether carboxylic aciddimeric surfactant type drag reducer has a structure formula m=2, 3, 4, and n=1, 2, 3. The drag reducer disclosed by the invention is a dimeric surfactant type drag reducer which has a head group of carboxylic acid, and the head group has the advantages of being very good in temperature resistance, salt resistance, environment protection and the like, and is capable of overcoming influence of a high-salt environment upon drag reduction performance, so that the drag reducer disclosed by the invention is high in drag reduction efficiency, good in shearing resistance, long-lasting and stable in drag reduction rate and good in salt resistance; and polyoxyethylene ether carboxylic acid dimeric surfactants of different mass concentrations are dissolved into water, a drag reduction solution whichis high in drag reduction efficiency, good in shearing resistance, long-lasting and stable in drag reduction rate and good in salt resistance can be prepared without any other compounded chemical reagent, solution blending steps are simple, the drag reducer is very convenient to use, and meanwhile, the salt resistance is greatly improved.
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Paragraph 0141; 0144-0145; 0150; 0153-0154; 0159; 0162-0163
(2019/09/13)
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- Facile Synthesis of Hydroxy-Substituted Thiacrown Ethers via Nucleophilic Ring Opening of Epoxides
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The title thiacrown ethers were prepared in a one-step procedure to give a series of unique macrocycles possessing two unsubstituted hydroxy groups that can be easily functionalized. In addition, epoxides and macrocycles derived from Cookson's birdcage diketone, were prepared. The nucleophilic ring opening of epoxides synthesis can be classified in the frame of click chemistry. Surprisingly, some of the prepared allyl substituted polyglycols as well as bis-epoxides, especially sulfur analogues, were prepared for the first time.
- Stefaniak, Monika,Romański, Jaros?aw
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p. 2214 - 2220
(2019/05/10)
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- One-pot Three Component Synthesis of ω-(oxathiolan-2-thion-5-yl)-α-oxazolidin-2-ones
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We report a practical and one-pot synthesis of novel series of ω-(oxathiolan-2-thione-5-yl)-α- oxazolidin-2-ones (3a-h). The obtained compounds have been designed, synthesized via reaction of oligoethylene glycols diglycidyl ethers, isocyanate and carbon disulfide in the presence of catalytic amount of lithium bromide. A variety of important oxazolidinone derivatives can be obtained from simple starting materials in good yields and the biological activity of these new products will be investigated in complementary study.
- Ghrab, Saad,Aroua, Lotfi,Beji, Mohamed
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p. 2397 - 2404
(2017/07/25)
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- Application of HPLC for the screening of separation of new macrocyclic systems
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The efficient synthesis of new macrocyclic systems via nucleophilic ring opening reaction of epoxides by thiols was described. Initially new macrocyclic compounds were obtained as a mixture of diastereomers. Preparative thin layer chromatography was applied to separate meso and pairs of enantiomer. The identification of products using a chiral HPLC column and mass spectroscopy was utilized.
- Stefaniak, Monika,Romański, Jaros?aw
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p. 245 - 248
(2017/01/22)
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- Diol glycidyl ether-bridged cyclens: Preparation and their applications in gene delivery
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Polymeric 1,4,7,10-tetraazacyclododecanes (cyclens) using diol glycidyl ether with different chain length as bridges (5a-e) were designed and synthesized from various diols, 1,7-diprotected cyclen and epichlorohydrin. The molecular weights of the title polymers were measured by GPC with good polydispersity. Agarose gel retardation and fluorescent titration using ethidium bromide showed good DNA-binding ability of 5. They could retard plasmid DNA (pDNA) at an N/P ratio of 4-6 and form polyplexes with sizes around 100-250 nm from an N/P ratio of 10 to 60 and relatively low zeta-potential values (5-22 mV). The cytotoxicity of 5 assayed by MTT is much lower than that of 20 kDa PEI. In vitro transfection against A549 and 293 cells showed that the transfection efficiency (TE) of 5c/DNA polyplexes is close to that of 20 kDa PEI at an N/P ratio of 5. Structure-activity relationship (SAR) of 5 was discussed in their DNA-binding, cytotoxicity, and transfection studies. The TE of 5c/DNA polyplexes could be improved by the introduction of 50 μM of chloroquine, the endosomolytic agents, to pretreated cells. These studies may extend the application areas of macrocyclic polyamines, especially for cyclen.
- Yi, Wen-Jing,Feng, Zhi-Hua,Zhang, Qin-Fang,Zhang, Ji,Li, Ling-Dong,Zhu, Wen,Yu, Xiao-Qi
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experimental part
p. 2413 - 2421
(2011/05/14)
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- Solvent-free synthesis of dihydroxy dithiacrown ethers
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The solvent-free reaction of oligoethylene glycol diglycidyl ethers with dimercaptoethane in the presence of benzyltrimethylammonium hydroxide (Triton B) gave, via regiospecific epoxide opening reactions, dihydroxy dithiacrown ethers in excellent yields and in short reaction times.
- Zoghlami, Houcine,Romdhani-Younes, Moufida,Chaabouni, Mohamed Moncef,Baklouti, Ahmed
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scheme or table
p. 881 - 883
(2011/03/20)
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- Polyoxyalkylene substituted and bridged triazine, benzotriazole and benzophenone derivatives as UV absorbers
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Triazine, benzotriazole and benzophenone derivatives which are substituted or bridged with polyoxyalkylene groups, according to claim1,and their use as UV absorbers, especially in photographic materials, in inks, including inkjet inks and printing inks, in transfer prints, in paints and varnishes, organic polymeric materials, plastics, rubber, glass, packaging materials, in sunscreens of cosmetic preparations and in skin protection compositions.
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Page column 69
(2010/11/29)
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