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. 2023 Feb 11;15(4):917.
doi: 10.3390/polym15040917.

Application of Lavender-Oil Microcapsules to Functionalized PET Fibers

Rita de Cássia Siqueira Curto Valle  1 , José Alexandre Borges Valle  1 , Fabricio Maestá Bezerra  2 , Jeferson Correia  1 , Cristiane da Costa  1 , Meritxell Martí  3 , Luisa Coderch  3 , Arianne López  4 , Manuel J Lis Arias  4
Affiliations

Application of Lavender-Oil Microcapsules to Functionalized PET Fibers

Rita de Cássia Siqueira Curto Valle et al. Polymers (Basel). .

Abstract

Surface treatments for textile substrates have received significant attention from researchers around the world. Ozone and plasma treatments trigger a series of surface alterations in textile substrates that can improve the anchoring of other molecules or particles on these substrates. This work aims to evaluate the effect of ozone and plasma treatments on the impregnation of polymeric microcapsules containing lavender oil in polyester fabrics (PES). Microcapsules with walls of chitosan and gum arabic were prepared by complex coacervation and impregnated in PES, plasma-treated PES, and ozone-treated PES by padding. The microcapsules were characterized for their size and morphology and the surface-treated PES was evaluated by FTIR, TGA, SEM, and lavender release. The microcapsules were spherical in shape, with smooth surfaces. The FTIR analyses of the textile substrates with microcapsules showed bands referring to the polymers of the microcapsules, but not to the lavender; this was most likely because the smooth surface of the outer wall did not retain the lavender. The mass loss and the degradation temperatures measured by TGA were similar for all the ozone-treated and plasma-treated polyester samples. In the SEM images, spherical microcapsules and the impregnation of the microcapsules of larger sizes were perceived. Through the lavender release, it was observed that the plasma and ozone treatments interfered both with the amount of lavender delivered and with the control of the delivery.

Keywords: drug delivery; essential oils; microcapsules; ozone; plasma; surface functionalization.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Optical micrographs of chitosan microcapsules.
Figure 2
Figure 2
Morphology of polyester-impregnated samples: (a) untreated polyester, (b) polyester treated with plasma, (c) polyester treated with ozone. Magnification of 2000 and 5000x.
Figure 3
Figure 3
FTIR spectra of the (a) polyester treated and untreated with and without microcapsules and (b) microcapsules and compounds isolated from the constitution.
Figure 4
Figure 4
The TGA measurements of the untreated polyester and plasma-treated samples, impregnated with lavender essential oil or microcapsules. Untreated polyester (black), plasma-treated polyester (red), plasma-treated polyester with microcapsules (blue), and plasma-treated polyester with the lavender essential oil (brown).
Figure 5
Figure 5
The TGA measurements of the untreated polyester and ozone-treated samples, impregnated with lavender essential oil or microcapsules. Untreated polyester (black), ozone-treated polyester (red), ozone-treated polyester with microcapsules (blue) and ozone-treated polyester with the lavender essential oil (brown).
Figure 6
Figure 6
The DTG comparison of the untreated polyester and plasma-treated samples, impregnated with lavender essential oil or microcapsules.. Untreated polyester (black), plasma-treated polyester (red), plasma-treated polyester with microcapsules (blue), and plasma-treated polyester with the lavender essential oil (brown).
Figure 7
Figure 7
The DTG comparison of the untreated polyester and ozone treated samples, impregnated with lavender essential oil or microcapsules. Untreated polyester (black), ozone-treated polyester (red), ozone-treated polyester with microcapsules (blue) and ozone-treated polyester with the lavender essential oil (brown).
Figure 8
Figure 8
Relative release of lavender oil, for the different square roots of time, from the microcapsules impregnated in polyester fabrics.
See this image and copyright information in PMC

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