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Use and determination of beta-cyclodextrin on textile substrates

Use and determination of beta-cyclodextrin on textile substrates. Bojana Vončina University of Maribor, Textile Department, Smetanova 17, 2000 Maribor, Slovenia. Structure and dimensions of cyclodextrins. Conical structure of  cyclodextrin.

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Use and determination of beta-cyclodextrin on textile substrates

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  1. Use and determination of beta-cyclodextrin on textile substrates Bojana Vončina University of Maribor, Textile Department, Smetanova 17, 2000 Maribor, Slovenia ITSAPT seminar, Guimaraes, November 2005

  2. Structure and dimensions of cyclodextrins ITSAPT seminar, Guimaraes, November 2005

  3. Conical structure of  cyclodextrin ITSAPT seminar, Guimaraes, November 2005

  4. Host–guest complex of  cyclodextrin and toluene ITSAPT seminar, Guimaraes, November 2005

  5. Applications of  cyclodextrin in textile: Application methods (Surface modification): • Exhausting method • Pad-batch method • Printing Washing Preparation of polymers In fibre spinning Surface modification Encaptulation ITSAPT seminar, Guimaraes, November 2005

  6. Polycarboxylic acids like 1,2,3,4 butanetetracarboxlic acid (BTCA) are well known nonformaldehyde crosslinking reagents. BTCA has four carboxylic acid groups, which can react with hydroxyl groups of cellulose and form stable ester bonds Esterification can occur with heat alone or it can be accelerated by the presence of salts of weak acids, such as sodium hypophosphite (SHPI). Physical properties of cotton fabrics treated with BTCA were comparable with those obtained for cotton treated with the most effective N-methylol reagents such as N, N’-dimethyloldihydroxy-ethylene-urea (DMDHEU) ITSAPT seminar, Guimaraes, November 2005

  7. Grafting of-cyclodextrin on cotton using polycarboxylic acid ITSAPT seminar, Guimaraes, November 2005

  8. Mercerised cotton, immersed in treated baths • Wet pick up 100% • Predried at 110 º C, 10 minutes • Fixation at 170 º C, 3 minutes • Washed in cold water and at 60 º C 30 minutes ITSAPT seminar, Guimaraes, November 2005

  9. -cyclodextrin molecules linked to textile substrate can be determined qualitatively by Phenolphthalein and Phenol red. Alkaline solution of Phenolphthalein changes colour from carmine red for untreated textile substrate to colourless for BTCA/-CD treated textile materials. Phenol red forms a yellow coloured complex with -CD, so Phenol red changes colour from red to yellow when -CD is present at the textile substrate. These qualitative methods can be use for white textile materials only. ITSAPT seminar, Guimaraes, November 2005

  10. 20 g/l β-CD, 6 g/l BTCA, 3 g/l SHPI ITSAPT seminar, Guimaraes, November 2005

  11. 30 g/l β-CD, 6 g/l BTCA, 3 g/l SHPI ITSAPT seminar, Guimaraes, November 2005

  12. 30 g/l β-CD, 6 g/l BTCA, 6 g/l SHPI ITSAPT seminar, Guimaraes, November 2005

  13. Quantitative determination of linked -CD • Gravimetrical method • The objective of the present study has been to develop semi-quantitative method for the evaluation of -CD fixed onto the textile materials by UV/Vis spectroscopy using alkaline solution of phenolphthalein. ITSAPT seminar, Guimaraes, November 2005

  14. amountCD (mL) pH ABS (550 nm) AF-ADF A brez 11,35 0,9624 0,9624-0,9624 0 1 11,35 0,7400 0,9624-0,7400 0,2224 2 11,38 0,6341 0,9624-0,6341 0,3283 3 11,36 0,4576 0,9624-0,4576 0,5048 4 11,36 0,3729 0,9624-0,3729 0,5895 5 11,35 0,3482 0,9624-0,3482 0,6142 ITSAPT seminar, Guimaraes, November 2005

  15. Conversion of carboxylic acid groups to carboxylate anions After-treatment of BTCA/CD finished cotton fabrics with alkaline solution separate ester carbonyl band from carboxylic acid band ITSAPT seminar, Guimaraes, November 2005

  16. ATR FT-IR spectroscopy of nanoencaptulated cotton ITSAPT seminar, Guimaraes, November 2005

  17. Mechanism of grafting with policarboxylic acids ITSAPT seminar, Guimaraes, November 2005

  18. Conclusions • We successfully grafted -cyclodextrinonto cellulose substrate by using crosslinking reagent BTCA. • In our research the rapid and simple spectroscopic method for determination of micro-amount of cyclodextrin in solution was adopted to determine the amount of -cyclodextrin bonded onto the textile material. ITSAPT seminar, Guimaraes, November 2005

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