Dyeability study of hemicellulose-rich man-made cellulosic fibers
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Journal Title
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Volume Title
Kemian tekniikan korkeakoulu |
Master's thesis
Authors
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Department
Major/Subject
Mcode
CHEM3024
Language
en
Pages
72+10
Series
Abstract
This thesis aimed to study the dyeability of hemicellulose-rich man-made cellulosic fibers, along with viscose, lyocell, and cotton, using two reactive dyes (C.I. RR141 and C.I.RY6). Before conducting the dyeability tests, preliminary experiments were carried out for the hemicellulose-rich fibers to understand the leaching behavior of hemicellulose from the fibers through alkali treatment. Sodium hydroxide (NaOH) at 5 and 10 g/L and sodium carbonate (Na2CO3) at 5, 10, and 20 g/L were tested. Various characterization processes conducted at this stage revealed the removal of hemicellulose content from the fiber when using a NaOH concentration of 10 g/L. However, the hemicellulose removal from the fiber was minimal, while 5 to 20 g/L Na2CO3 was used as an alkali agent. Having established that the hemicellulose content was stable when using Na2CO3 concentrations between 10 to 20 g/L, dyeability tests were carried out using 5 and 10 g/L NaOH concentrations and 15 g/L Na2CO3 concentrations. The results obtained showed that dyeing performance for the man-made cellulosic fibers is better compared to cotton across all alkali concentrations, with the highest color strength (K/S) values for hemicellulose-rich fibers for both dyes. Furthermore, the results obtained from the color change to washing, rubbing, and light fastness tests revealed that there is a minimal effect of different alkali concentrations on fastness properties, as all the fabrics showed very good to excellent color fastness results.Description
Supervisor
Tehrani, AliThesis advisor
Hummel, MichaelRoselli, Annariikka