共查询到20条相似文献,搜索用时 15 毫秒
1.
Fanny Jaillet Myriam Desroches Rémi Auvergne Bernard Boutevin Sylvain Caillol 《European Journal of Lipid Science and Technology》2013,115(6):698-708
Soybean oil was modified into a novel biobased polyacid hardener by thiol‐ene coupling with thioglycolic acid. The structure of the initial soybean oil and polyacid triglyceride was carefully analyzed using 1H NMR and titration. The thermal crosslinking reaction between acid hardener and epoxidized resin was studied by differential scanning calorimetry (DSC) and rheology. Then, the synthesized biobased acid hardener was employed as a novel curing agent for bisphenol A diglycidyl ether to elaborate new partially biobased materials. These materials, formulated in stoichiometry ratio, were characterized by DSC, thermogravimetry analyses, dynamic mechanical analyses and exhibit interesting properties for coatings. Practical applications: The products of the chemistry described in this contribution, i.e., polyacid from soybean oil and thioglycolic acid, provide biobased building blocks for further epoxy resin syntheses by reaction with epoxy groups. The obtained epoxy resins are partially biobased and may be applied as binders and coatings. 相似文献
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Cationic polyelectrolyte, PDDA (Poly(diallyldimethylammonium chloride)), was impregnated on mesoporous silica SBA-15 (PDDA/SBA-15)
and amorphous conventional silica (PDDA/CS) supports. Acid dye adsorption characteristics, such as adsorption kinetics, adsorption
isotherms, maximum adsorption capacity, and breakthrough curves of the prepared PDDA/SBA-15 and PDDA/CS adsorbents, were examined
by batch and column adsorption techniques where the Acid Violet 17, Acid Red 44, and Acid Blue 45 were used as target adsorbates.
PDDA/SBA-15 adsorbent showed fast adsorption kinetics of less than 10 min and much higher adsorption capacities compared to
PDDA/CS due to large pore sizes, ordered cylindrical pore structures, and high amount of impregnated PDDA. Results from batch
and column experiments showed that practical use of PDDA/SBA-15 adsorbent for effective removal of acid dyes from aqueous
solution would be possible. Polyelectrolyte impregnation method was suggested as a simple method for the development of adsorbent
with large pore diameters and efficient adsorption characteristics. 相似文献
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Yasuji Ihara 《应用聚合物科学杂志》1986,32(6):5665-5667
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Photo‐polymerization behaviors of bisphenol‐A epoxy diacrylate (EPA) and six kinds of EPA‐derived resins containing different amounts of carboxylic acid, urethane, amide, and imide groups were studied by a photo differential scanning calorimetry. The dark polymerization was performed and pseudo‐steady state assumption of growing radicals was made to obtain the kinetic constants for propagation, bimolecular termination, monomolecular termination, and the concentration of growing radicals of different resins as a function of extent of reaction. Compared with EPA, it was found that the rate of polymerization and kinetic constants of the six resins were relatively small because the mobility of reacting species in resins was restricted by carboxylic acid, urethane, amide, and imide groups. Finally, three different photo‐initiators were used to initiate the polymerization, and their kinetic behaviors were compared. The effect of tertiary amine group of photo‐initiator on the rate of polymerization of resins having carboxylic acid group and the initiator efficiency were discussed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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The adsorption of cyanogen chloride on impregnated carbon containing copper and chromium compounds and other additives is accompanied by the formation of carbon dioxide. Presorbed water enhances the formation of carbon dioxide and decreases the desorption of cyanogen chloride. Cyanogen chloride is adsorbed irreversibly because hydrolysis takes place at a rate higher than that of desorption. 相似文献
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Elizabeth C. Smith P. M. Althouse James W. Shigley 《Journal of the American Oil Chemists' Society》1960,37(6):288-290
Summary N-Phthaloylglycylaminocthanol may be prepared in 24% yield by a modification of the Shechan carbodiimide synthesis of peptides
of hydroxy amino acids (6). The amino alcohol is characterized as to melting point, solubility in various solvents, the ability
to form a derivative with acetic anhydride, percentage of nitrogen, and infrared spectra. In acid solution this compound appears
to undergo the aminoacyl shift characteristic of compounds containing an amide linkage and a free hydroxyl group. Attempts
to isolated N-glycylaminoethanol by hydrolysis of the phthaloyl derivative with hydrazine hydrate have been unsuccessful.
Impure N-phthaloylalanylaminoethanol and N-phthaloylglycylglycylaminoethanol were also synthesized by means of this procedure.
Several other methods for synthesizing N-glycylaminoethanol are discussed.
Portion of a thesis presented by Elizabeth C. Smith as partial fulfillment of the requirements for the degree of Doctor of
Philosophy.
Authorized for publication as Paper No. 2399 on Sept. 1, 1959, in the Journal Series of the Pennsylvania Agricultural Experiment
Station. 相似文献
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Completely water‐insoluble resins containing amine, carboxylic acid, and sulfonic acid as ligand groups were synthesized by radical polymerization in solution. The yield was higher than 97%. The resins were characterized by FTIR spectroscopy and thermal analysis. The metal ion retention properties at different pH values were investigated by a batch method. Metal ions studied were: Cu(II), Cd(II), Zn(II), Hg(II), Pb(II), and Cr(III). The metal ion binding ability depended strongly on the pH. The retention properties were also tested under competitive conditions. Elution of the metal ion was investigated in acid medium at different concentrations. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 700–705, 2003 相似文献
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Suzuki偶联反应是合成联苯结构的重要方法之一,本文以溴带芳烃和有机硼酸酯为原料,尝试了带有裸露羧酸根的Suzuki反应,并以62%的产率得到了联苯羧酸衍生物。这为联苯衍生物以及含有联苯结构的生物活性分子的快速生产提供了更为多样化的合成路线,为有效地推动联苯结构化合物的工业化生产做出了贡献。 相似文献
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2-Amino-N-heterocycles, such as 2-aminopyridine 7 or 2-aminobenzimidazole 16 as well as benzamidines 19 possessing a N-(4-nitrobenzyl)-substituent react as N-C-N-C-synthons with formamide chlorides 5 , formamide acetals 2 or acetic anhydride (C1-building blocks) with formation of imidazole compounds 9 , 17 or 22 , respectively in the presence of triethylamine. In some cases, intermediate N-acetylation ( 20 ) or N-formylation products 21 are isolated. 相似文献
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Macroreticular copolymer beads were prepared by suspension polymerization of 4-vinylbenzyl chloride (VBC), divinylbenzene (DVB) and monomers with carboxylic ester groups like dibutyl maleate (DBM), dibutyl fumarate (DBF) and dibutyl itaconate (DBI) in the presence of toluene as diluent. The copolymer beads were phosphorylated at the chloromethylated phenyl rings with triethyl phosphite and hydrolyzed by an aqueous sodium hydroxide solution; the hydrolysis on the bead surface converted carboxylic ester/phosphonate groups into carboxylic acid/phosphono groups, respectively. The investigations on the metal ion chelation characteristics of the H-form copolymer beads revealed that they have good adsorptivity toward heavy metal ions like Pb2+, Cd2+ and Cu2+, and poor adsorptivity toward ions like Hg2+ and UO22+. The adsorptivity caused by the three carboxylic ester monomer derivatives was in the order DBM > DBI > DBF. Especially, the Na-form copolymer beads neutralized by alkali treatment were very available for the adsorption of all the metal ions under investigation. 相似文献
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Kunda Uma Maheswara Rao 《分离科学与技术》2017,52(7):1153-1159
The sorption kinetics of Pd(II) from hydrochloric acid solutions by 1 and 2 impregnated Amberlite XAD-7 resins (3 and 4) have been systematically studied. Both impregnated resins selectively and efficiently adsorb Pd(II) from single metal solution and automotive catalyst residue solution. In comparison between 3 and 4, 4 showed more efficiency toward Pd(II) with respect to contact time, loading, and stripping capacities. 3 and 4 were characterized by XRD and SEM analyses before and after Pd(II) sorption. We also studied the reusability of 3 and 4 and both the resins offer excellent performance for three times. 相似文献
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The adsorption of N-(phenyl)maleimide and its derivatives on iron electrodes in sulfuric acid medium has been studied by the capacitance method. The process investigated is well described by Frumkin's isotherm. The adsorption parameters characterizing the interaction forces between the species in the adsorbed layer, the area occupied by each species and the maximum surface excess have been calculated on the basis of this isotherm. Combining data from the electrochemical method with quantum-chemical calculations of the chemical structure and the partial electronic charges of the compounds studied a mechanism of adsorption on the iron surface is proposed. The inhibiting effect observed is explained in relation to the adsorption behaviour. 相似文献
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Urea formaldehyde, melamine formaldehyde, and melamine urea formaldehyde (MUF) are important industrial amino resins that find application in numerous diverse areas, most notably in the bonding of wood products. To understand the physical properties of these amino resins and, hence, optimize their performance, a knowledge of their chemical structure is necessary. This article reports the use of NMR spectroscopy to acquire this information in the solid and liquid states. 13C‐NMR experiments, supported and augmented by 1H‐NMR and 15N‐NMR results, showed that the two stages of resin synthesis, methylolation followed by condensation, occurred in each type of resin. However, in the various MUF samples analyzed, the second step appeared to be predominantly the self‐condensation of melamine and urea rather than the cocondensation of melamine and urea. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3504–3512, 2004 相似文献
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《分离科学与技术》2012,47(15):2361-2373
ABSTRACTAmino acid functionalized D301 resins (Tyr-D301, Phe-D301, and Ala-D301) are successfully prepared to remove phenols. The influences of adsorption condition on adsorption ability and the practical application value are investigated. The functionalized D301 resins possess strong adsorption ability toward phenol by ways of hydrogen bond interaction. The adsorption capacity of Tyr-D301, Phe-D301, and Ala-D301 is 388.2, 368.4, and 321.5 mg· g?1 at 293 K and pH of 2, respectively. The adsorption process could be described satisfactorily by Lagergren-first-order model and Langmuir model. The rate constant is 0.057, 0.042, and 0.035 min?1, respectively. The functionalized D301 can be used to dispose wastewater containing phenols. 相似文献
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分别用3-氨基-1,2-丙二醇(3-APD)和2-氨基-1,3-丙二醇(2-APD)对多孔氯甲基聚苯乙烯树脂(CMPS)进行修饰,制备得到含邻、间位二羟基官能团的硼螯合树脂:PS-3-APD和PS-2-APD。用傅里叶红外光谱仪(FTIR)、元素分析仪(EA)、压汞仪(MIP)和激光粒度仪(LPS)对材料进行表征,确认功能单体成功接枝于氯球上。对两种树脂进行了静态提硼性能研究,分别考察了原料液pH、初始硼酸浓度、外来金属离子对硼酸吸附量的影响,当溶液pH为9.15~9.20时,两种树脂对硼酸吸附量最大;溶液中Na+、Mg2+、Ca2+的存在会一定程度削弱树脂对硼酸吸附性能。吸附动力学表明其吸附速率较快,且均满足准二级动力学模型。与Freundlich相比,吸附等温线更符合Langmuir模型,拟合得到的理论最大吸附量分别为0.730mmol/g和0.868mmol/g。本文对未来新型硼螯合树脂的开发及工业化应用提供参考和指导。 相似文献