Abstract
2, 6-Dichloro-4-alkyl(C816)-1, 3, 5-triazines obtained by the Grignard reaction of cyanuric chloride were treated with polyethylene glycols in the presence of potassium t-butoxide to give a series of homogeneous nonionics (Cn-TA-2 m: 2-5) with two poly (oxyethylene) (POE) chains in a molecule. The same poly (oxyethylen)ation of 2-hexyloxy-4, 6-dichloro- and 2, 6-bis (hexyloxy)-4- chloro-1, 3, 5-triazines also gave several nonionics carrying a 1, 3, 5-triazine ring (C60-TA-2 En, and (Ce0)2--TA-E, m, respectively). Cloud point, aqueous surface tension and critical micelle concentration (CMC) of these nonionics were determined and compared with those of POE monoalkyl ethers and of acetal type of nonionics having a general formula, RCH[O(E0), , H]2. Cn-TA-2E, Th showed a moderate surface activity (Fig.2) and higher cloud point (Fig.1).1, 3, 5-Triazine ring in Cn-TA-2E, , appeared to behave as a hydrophilic group equivalent to 2-3 units of oxyethylene (OE). On the other hand, (C60)2-TA-Em, showed rather higher surface activity and lower cloud point. The CMC of Cl2-TA-2E initially decreased and then, through a minimum, increased as the number of OE units was increased. This anomalous trend in OE number dependence of CMC is extremely analogous to that reported previously for acetal nonionics having geminal POE chains (Fig.3). The results may be related to a configurationally restricted state in POE chains owing to interaction between two POE chains located closely in a surfactant molecule.
