Abstract
A series of hyperbranched polymer surfactants (HBP-C8, HBP-C12 and HBP-C16) were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers (HBP) and fatty acyl chloride. The structure of obtained hyperbranched polymer surfactant was characterized by FTIR, NMR and GPC. The results showed that the products have amphiphilic structure. The thermal property of the hyperbranched polymer surfactant investigated by DSC and TGA was strongly influenced by the length of end alkyl chain. Surface activity of hyperbranched polymer surfactant was analyzed by surface tension method and UV spectrophotometry, respectively. The results showed that hyperbranched polymer surfactant took on better surface activity, which can effectively reduce the surface tension of the water. The hyperbranched polymer surfactant has a lower critical micelle concentration (CMC) and displays single molecular micellar properties, which can package small hydrophilic molecules in relatively low concentration.Graphical abstract
Highlights
Hyperbranched polymers are three-dimensional structures of highly branched with rich in active end groups, and have the characteristics of high solubility and strong shear resistance, and so on [1,2,3,4]
The results showed that hyperbranched polymers (HBP)-C has the characteristic absorption peak of alkyl chains, so they were successfully synthesized by the modification reaction
As shown in Figure, three kinds of modified product made the surface tension of the water obviously decrease. This is because there are many hydrophilic hydroxyls which can stretch into water and hydrophobic alkyl chains which penetrate into air on the special amphiphilic structure of hyperbranched polymer surfactants with different carbon chains (HBP-C)
Summary
Hyperbranched polymers are three-dimensional structures of highly branched with rich in active end groups, and have the characteristics of high solubility and strong shear resistance, and so on [1,2,3,4]. A kind of hyperbranched polymer surfactant was prepared by using fatty acyl chloride and hydroxyl terminated hyperbranched polymer in which there are large number of hydrophilic hydroxyl and hydrophobic alkyl chain, and its surface activity is studied by surface tension method and UV spectrophotometry. Such a new type of surfactant with multiterminal hydrophilic/hydrophobic structure demonstrates better surface activity, and has a lower critical micelle concentration and display single molecular micellar properties, which can package hydrophilic small molecule in relatively low concentration
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