Ramie degum liquor: Wastage bio-macromolecule for making thermally stable functionalize polyester fabric
2022
Bhowmick, M. | Basak, S. | Samanta, Kartick K
Decorticated ramie fibre has been degummed with alkali based formulation and the wastage degummed liquor has been applied on the polyester fabric at different concentrations by following padding technique. Degummed liquor has been characterized by using Liquid chromatography mass spectroscopy (LCMS), Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC) and Thermo-gravimetry (TG) analysis to understand the major chemical groups present in it and its thermal behavior. Chromatography results revealed the presence of different polyphenols, pectin, tannin based compound in the degum liquor. TG curve of degum liquor reveals almost 50% mass retention at 500°C. Treated polyester fabric showed almost 40% more limiting oxygen index (LOI) as compared to the control fabric. In addition of it, melt dripping property of the treated polyester fabric also has been stopped with lower shrinkage during combustion. TG analysis of the said fabric showed 20–25% more char mass retention and lower rate of weight loss as compared to the control one. Char morphology of the control and the treated fabric was also examined and analyzed in detail. Besides, a mechanism lies behind the flame retardancy of the polyester fabric also has been postulated with the composition of the chemical compound present in the wastage liquor. It was found that high molecular weight phenolic components, pectin, natural coloring matter, tannin based polyphenols etc. present in the degum liquor playing a major role behind thermal stability. Lastly, tensile and physical properties of the treated fabric also have been measured and analytically compared with the untreated polyester.
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