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Indexed by:期刊论文

Date of Publication:2011-07-05

Journal:COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

Included Journals:SCIE、EI

Volume:384

Issue:1-3

Page Number:612-617

ISSN No.:0927-7757

Key Words:Single long-chain; Double long-chain; Triazine; Synthesis; Surface tension

Abstract:This paper discusses a series of single and double long-chain 1,3,5-triazine amphoteric surfactants, which were synthesized by cyanuric chloride, aliphatic amines and sodium 2-(methyl amino) ethane sulfonate. Their structures were confirmed by MS. NMR and IR. The critical micelle concentrations (CMC) and surface tensions at CMC (gamma(CMC)) of all prepared amphoteric surfactants were determined by K100C processor tensiometer at 25 degrees C. As the length of the hydrophobic chain of single long-chain 1,3,5-triazine amphoteric surfactants increases, the values of their CMC and gamma(CMC) gradually decrease, and the minimum average area per surfactant molecule (A(min)) increases. The gamma(CMC) values of double long-chain 1,3,5-triazine amphoteric surfactants are observed to be obviously lower than that of the single long-chain ones. For double long-chain 1,3,5-triazine amphoteric surfactants, the more symmetrical hydrophobic chains are, the lower gamma(CMC) values are. When two hydrophobic chains are symmetrical, the longer hydrophobic chains, the lower values of gamma(CMC) and A(min). However, the gamma(CMC) and A(min) of the surfactant with double 12 hydrophobic chains ascends. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.