Abstract
A series of poly nonylphenol polyoxyethylene ether nonionic surfactants with different polymerization degerees was synthesized with nonyl phenol and formaldehyde. The structures were characterized by infrared spectroscopy and nuclear magnetic resonance. Moreover,the surface properties were evaluated using the surface tension method. It is found that critical micelle concentration( cmc) of monomer,dimer and trimer incease with increasing of the number of hydrophilic group epoxyethane( EO) of the surfactants. In the case of the same number of EO,the cmc of surfactants were significantly reduce with the increase of the degree of polymerization. Although dimer and trimer show good surface properties,the surface property of trimer is more excellent than dimer. Moreover,dimer and trimer show more excellent adsorption and dispersion performance because the arrangments of them on the air / water boundary are significantly more compacted than dimer.
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