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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Abbreviations
- XRD:
-
X-ray diffraction
- DSC:
-
Differential scanning calorimetry
- TGA:
-
Thermogravimetry analysis
- CHPTAC:
-
3-chloro-2-hydroxypropyltrimethyl ammonium chloride
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Acknowledgments
The authors gratefully acknowledge the financial support of the Special Project of National Grand Fundamental Research Pre-973 Program of China (Program/Grant No. 2004CCA00700). We are also appreciated the support from the National Natural Science Foundation of China (NSFC) (Grant No. 20473051).
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Liu, ZT., Yang, Y., Zhang, L. et al. Study on the cationic modification and dyeing of ramie fiber. Cellulose 14, 337–345 (2007). https://doi.org/10.1007/s10570-007-9117-0
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DOI: https://doi.org/10.1007/s10570-007-9117-0