| The p-tert-butyl calix[n]arenes(n=4,6,8) were synthesized from p-tert-butylphenol and formaldehyde; 10-bromodecanoic-acid methyl ester was synthesized from 10-bromodecanoic-acid and methanol; 9 kinds of calixarene oligomeric surfactants were prepared by etherification of the calix[n]arenes(n=4,6,8) with 10-bromodecanoic-acid methyl ester, 1,3-propane sultone and 1,4-butane sultone. The structures of intermediates and final products were confirmed to be correct by FTIR and NMR.The products were qualitatively identified by dye method. The surface tensions of dilute aqueous solutions of the surfactants were measured at 25℃by drop-volume method. The surface activity properties of products were studied and the values of cmc,γcmc,Γmax and Am were given. The results indicated that with the calixarene cavity increased, cmc andΓcmc of the surfactants solution decreased, butγcmc and Am increased. Through scanning interfacial tension measurement, the interfacial performances of the surfactants were investigated, and nmin values of the six types of calixarene oligomeric surfactants were given. In addition, the dynamic interfacial tension behaviors were also studied.
|
PDF Full Text Request