Abstract
In this study, adsorption control and estimation of stimuli-reducing function of hydrophobic phospholipid polymer were carried out. The hydrophobic phospholipid polymer consisting of 2-methacryloyloxyethyl phosphorylcholine and stearyl methacrylate (PMS) was synthesized by ordinary radical polymerization. PMS nano-dispersion was prepared by the self-aggregation technique. Surface potential changes of PMS nano-dispersion were studied by laser-Doppler electrophoresis at pH conditions of 2 to 8. PMS nano-dispersion was positively charged under acidic conditions, and electrostatic adsorption to cotton fiber was observed by X-ray photoelectron spectroscopy (XPS) analysis. On the other hand, under neutral and basic conditions, non-charged and negatively charged nano-dispersions were not adsorbed. A fluorescence microscope observation of cotton fibers treated with PMS nano-dispersion that contained Nile Red suggested that a lamellar structure was formed in the PMS coat layer. The sulfur/carbon ratio (S/C) evaluated by XPS analysis showed that the amount of alkyl sulfate, which is a main component of laundry detergent, on the PMS treated cotton fibers was smaller than that on non-treated fibers after a laundry/rinse process. Cytotoxicity studies using three-dimensional skin models showed that the toxicity of surfactant was reduced by the PMS treatment.
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