Abstract-Polyurethane nanocapsules containing Cassia alata leaves extract were synthesized by an emulsion diffusion process. The influences of stirring speed and dilution time were studied on the chemical and physical properties of nanocapsules. Fourier Transform Infrared Spectroscopy (FTIR) was used to study the chemical structure of nanocapsules and Cassia alata leaves extract. Size distribution and morphology of nanocapsules were examined using laser particle size analyzer and Scanning Electron Microscopy (SEM) respectively. The encapsulated were applied to finish cotton fabrics to enhance antibacterial property. The results revealed that polyurethane nanocapsules containing Cassia alata leaves extract were successfully synthesized by an emulsion diffusion method. The dilution time influenced encapsulation yield. The stirring speed and dilution time do not have a significant effect on particle size distribution. The obtained nanocapsules are rather spherical shape and smooth surface. Cotton fabrics finished with nanocapsules showed antibacterial activity against Staphylococcus aureus.
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