earticle

영어

Photo-responsive surfactants obtained from Tween 20 and coumarin derivatives, which attached on the ends of PEO fragment of Tween 20 through ester or ether bond. The molar ratios of the coumarin residues to Tween 20 in both of these two conjugates having ester bond (TCES) and ether bond (TCET) were about 1:1.Coumarin residues of TCES and TCET could be photo-dimerized, and the photo dimerization degrees were in the order of TCET >TCES >free coumarin derivative. The air/water interfacial activity was in the order of TCET >Tween 20 >TCES, and the interfacial activities of TCES and TCET increased with the UV irradiation time. This possibly comes from the photo-dimerization of the couamrin residues on Tween 20. The decrease in the interfacial activity of TCES was slightly greater than that of TCET, probably because of the differences in the length, the polarity and the flexibility of the linker between coumarin residue and Tween 20.