Abstract
Double-encapsulated microcapsules (DEMs) were prepared and effectively adsorbed onto the cotton fabric surfaces during impregnation without crosslinking agents to obtain functional cotton fabrics. Specifically, Fourier transform infrared spectrometer (FTIR) and confocal laser scanning microscope (CLSM) showed two different molecules (lavender essence and dye indigo) were encapsulated into the microcapsules simultaneously, with loading capacity of 10% and 9.73%, respectively. The spherical shape of DEMs was confirmed by transmission electron microscopy (TEM), confocal laser scanning microscope (CLSM) and average particle sizes were about 617 nm, as measured by dynamic light scattering (DLS). According to the results of IR and X-ray photoelectron spectroscopy (XPS) experiments, DEMs was combined with cotton fabrics by hydrogen bond. The superior thermal stability of microcapsules and functional cotton fabrics was also demonstrated. The adsorption behavior and mechanism of microparticles onto cotton fabrics were further examined by chemical property characterization in combination with adsorption kinetic model. The kinetic adsorption process included three stages: fast adsorption, slow adsorption rate, and adsorption equilibrium. Finally, the good color fastness of the functional cotton fabrics was demonstrated by the tests of rubbing and accelerated laundering. Herein, this study will be beneficial to the development of functional cotton fabrics-based materials.
Highlights
Transmission electron microscopy (TEM) images suggested that uniform and evenly distributed spherical morphology with distinct color contrast between the center and the shell of the components, indicating the formation of vesicular structure after the simultaneous encapsulating of indigo and lavender essence, as well (Figure 1b), the experimental results are consistent with literature [26]
We reported our study into the microcapsule capsulating two substances simultaneously, which was applied to cotton fabrics to obtain functional cotton fabrics
The adsorption behavior and adsorption mechanism for the Double-encapsulated microcapsules (DEMs) onto cotton fabrics were studied by means of physicochemical properties and adsorption kinetics
Summary
As one of the most important vat dyes, has excellent water resistance, light resistance, and friction resistance, which is widely used in food, medicine, and in the printing and dyeing industries [1], but its strong low water solubility drastically limits its applications. For its hydrophobicity, high volatility, and poor stability to light, heat, and moisture, new technical approaches are required to overcome the current limitations of lavender essence. Microencapsulation technology has been widely used in food [5,6], dyeing and finishing [7,8], coating [9,10] and biotechnology [11], and many other fields, which can effectively improve the physical properties of substances (e.g., dye and essence), improve stability, etc
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