Thermal Behavior of Microencapsulated Fragrances on Cotton Fabrics

Abstract

Abstract.Microencapsulated products are very common in some fields such as pharmacy and the textile industry has recently incorporated them into their products. Firstly, this research assessed the presence of flavour microcapsules on cotton fabric using different padding applications and evaluated them using Scanning Electronic Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). When the OH stretching region between 3700-3000 cm -1 from spectra are examined, we propose some area ratios to quantify the microcapsules presence on the fabric. The ratios proposed show that when the concentration of microcapsules in the padding bath increased their value increased too. Secondly, we analyze the effect that thermal treatment can cause on microcapsules. This was undertake using hot air at 120º C, 140º C and 160º C, or by ironing the fabric impregnated with microcapsules at 110º C, 150º C and 200º C, by ironing 1, 5 and 10 times on the analyzed zone. It was found that when the temperature is higher than 120º C, microcapsules are deflated and damaged. This could be seen using SEM images and checked using FTIR analysis. KEY WORDS Abstract.Firstly, this research assesses the presence of fragrance microcapsules on cotton fabric using different padding applications and evaluates them using Scanning Electronic Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). When the OH stretching region between 3700-3000 cm -1 from spectra are examined, we propose some area ratios to quantify the microcapsules presence on the fabric. The ratios proposed show that when the concentration of microcapsules in the padding bath increases their value increases too. Secondly, we analyze the effect that thermal treatment can have on microcapsules. This was undertaken using hot air at 120º C, 140º C and 160º C, or by ironing the fabric impregnated with microcapsules at 110º C, 150º C and 200º C, and by ironing 1, 5 and 10 times on the analyzed zone. It was found that when the temperature is higher than 120º C, microcapsules are deflated and damaged. This could be seen using SEM images and checked using FTIR analysis.

Preparation of coated thermo‐regulating textiles using Rubitherm‐RT31 microcapsules

“…Nowadays, textile industry shows a growing interest into the functionalization of textiles for innovative commercial applications. The emerging technologies based on microencapsulation are able to confer new properties and add value to the textiles that are not possible or cost‐effective using other technologies 1–3…”

“…Several methods of incorporating PCM microcapsules into a fibrous structure have been developed. The microcapsules can be applied by stamping works, exhaustion dyeing, impregnation, spraying and coating or by direct incorporation in the fiber without highly modifying its touch and color 3, 11, 12. In previous applications of PCM technology in the textile industry, for garments and home furnishing products, microencapsulated PCM were incorporated into acrylic fibers6 or polyurethane foams13 or were embedded into a coating compound and topically applied to a fabric 14.…”

Study on the Possibilities to Graft Microencapsulated Essential Oil on Natural Fibres and Terry Fabrics

“…As is evident from Figures 1.a -5.a, the microcapsules are of very regular spherical shape, without any deformations or changes in their shell. The authors in [20] also confirmed the fact that there were no transformations in peppermint microcapsules applied on cotton fabric heated by air at 120 °C. Additionally SEM analysis showed that with an increase in the temperature of up to 160 °C, the swelling was reduced considerably.…”

“…The yarn samples grafted with Eucalyptus microcapsules were analysed by SEM, which was a good technique for other qualitative research [3,20,29]. Researches in [3] confirmed that the effect of changing the concentration of micro-spheres in dispersion can be easily observed from SEM micrographs.…”

“…Research [20] confirmed that when different concentrations of microcapsules were used in the padding bath, the quantity of MC that remained on the cotton twill fabric was different. Furthermore the authors detected some deflated microcapsules by SEM analysing the fabric heated at 140 °C.…”