A series of carboxylic ester‐containing imidazolium‐based zwitterionic surfactants, namely, monoalkyl 2‐(3‐methylimidazolium‐1‐yl) succinate inner salts (CnMimSU, n = 8, 10, 12 and 14), have been synthesized. Their structures were confirmed by 1H NMR, 13C NMR and FTIR. The typical physicochemical properties parameters such as isoelectric point, critical micelle concentration (CMC), surface tension at CMC (γCMC), surface pressure at CMC (ΠCMC), adsorption efficiency (pC20), the maximum surface excess (Γm), the minimum molecular cross‐sectional area (Amin) and the value of CMC/C20 were determined. The effect of the long‐chain length on the important physicochemical properties of CnMimSU was studied. It is found that the surface activity of CnMimSU is enhanced with the long‐chain length increases.
Abstract. 4-(2-hydroxyphenoxy) phthalic nitrile was prepared by the nucleophilic substitution reaction of catechol and 4-nitro phthalic nitrile in DMF with the existence of N 2 and K 2 CO 3 . The optimal reaction conditions were obtained as follows: the mole ratio of catechol, K 2 CO 3 and 4-nitro phthalic nitrile is 2:1:1, with the quality of the solute concentration of 0.222g/mL and reaction temperature 80°C. Consequently, the yield of final product reached 87.64%, and the structure of the 4-(2-hydroxyphenoxy) phthalic nitrile was characterized by IR, 1 H NMR and DSC.
IntroductionWith the development of aerospace industry, the high-temperature resistant resin matrix composites have attracted a lot of attentions owing to their promising applications in aerospace manufacturing. Among the wide range of high-temperature resistant resin matrix composites, nitrile resin matrix composites, which possess excellent mechanical property, high-temperature resistance, abrasion resistance, flame resistance and high char yield, are widely applied in the preparation of new-style equipment [1][2]. Therefore, many researchers [3][4][5][6][7][8][9][10][11] have focused on their research of phthalic nitrile. Besides, a lot of researches [12][13][14][15] showed that phenol hydroxyl could improve the self-catalyzed property of phthalic nitrile monomer. However, at present, many researches about this resin monomer are mainly at the stage of laboratory research. One important reason is the lack of basic data for extensive industrial application. In this paper, we used the catechol and 4-nitro phthalic nitrile to synthesize 4-(2-hydroxyphenoxy) phthalic nitrile, and the structure was characterized by
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