Study on the cationic modification and dyeing of ramie fiber |
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Authors: | Zhao-Tie Liu Yani Yang Lili Zhang Zhong-Wen Liu Heping Xiong |
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Institution: | (1) Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry & Materials Science, Shaanxi Normal University, Chang’an South Street 199, Xi’an, 710062, P.R. China;(2) Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, P.R. China |
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Abstract: | A modification procedure for ramie fiber using 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTAC) as a cationic
agent and NaOH as a catalyst was developed in this paper. The morphological and structural transformations of the fiber induced
by modification were determined by XRD (XRD), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA).
XRD results show that the crystal structure of the modified fiber was still preserved although its crystallinity was decreased,
which was confirmed from the TGA results. The mechanisms for the modification and dyeing of ramie fiber were analyzed, and
the optimum modification conditions were determined to be the CHPTAC concentration of 30 g L−1, the NaOH concentration of 15 g L−1, the reaction temperature of 50 °C, and the reaction time of 60 min. The raw and the modified fibers were dyed with C.I.
reactive red 2. The K/S values for the cationic modified fiber increased to be three times as high as the unmodified fiber. The dye uptakes increased
greatly with an increase in the nitrogen contents up to 0.4% on the modified fibers. |
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Keywords: | Ramie fiber Cationic modification 3-chloro-2-hydroxypropyltrimethyl ammonium chloride C I reactive red 2 |
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