Abstract
A new amino-terminated hyperbranched polymer (at-HBP) was synthesized, and its salt-free dyeing property on ramie fabric was studied. The structure and molecular weight of at-HBP were established by Fourier transform infrared spectrometer, H nuclear magnetic resonance and gel permeation chromatography. The untreated ramie fabric and modified ramie fabrics were characterized by an X-ray diffraction (XRD) and field emission scanning electron micrograph (FE-SEM). XRD results showed a transformation of the crystalline structure from ramie cellulose I to cellulose II allomorph during mercerization and epichlorohydrin modification, and the crystalline structure of cellulose II was maintained with an obvious crystallinity index increase after at-HBP modification. FE-SEM results confirmed that at-HBP was successfully grafted onto the fabric surface. Dyed with reactive dye C.I. reactive Blue 4, the color strength of the at-HBP-modified fabric was enhanced, even when dyeing was carried out without the electrolyte. The washing and rubbing fastness of the salt-free dyeing of fabrics was also good compared with those obtained by conventional dyeing. The adsorption isotherm of C.I. reactive Blue 4 on modified fabric was examined and found to follow a Langmuir-type adsorption model. The at-HBP modification mechanism of ramie fabric and dyeing mechanism with reactive dye were suggested.
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Abbreviations
- at-HBP:
-
Amino-terminated hyperbranched polymer
- XRD:
-
X-ray diffraction
- FT-IR:
-
Fourier transform infrared spectrometer
- 1HNMR:
-
H nuclear magnetic resonance
- GPC:
-
Gel permeation chromatography
- FE-SEM:
-
Field emission scanning electron micrograph
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Acknowledgments
This work was supported by the Natural Science Founndation of Jiangsu Province (no. BK2011799 and no. BK20140939) and the specialized research fund for the Doctoral Program of Higher Education of China (no. 20113221120006). The authors also gratefully appreciate the support from the National Natural Foundation of Science, China (no. 51003047).
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Wang, GW., Zhuang, LH., Sun, J. et al. Salt-free dyeing of ramie fabric with an amino-terminated hyperbranched polymer. Cellulose 21, 3725–3736 (2014). https://doi.org/10.1007/s10570-014-0345-9
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DOI: https://doi.org/10.1007/s10570-014-0345-9