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Polymers 2018, 10(7), 709; https://doi.org/10.3390/polym10070709

In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption

1
Key Laboratory of Bio-Based Materials Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
2
Research Center of Wood Bionic Intelligent Science, Northeast Forestry University, Harbin 150040, China
3
School of Environment, Harbin institute of Technology, Harbin 150040, China
4
Dehua TB New Decoration Material CO., LTD, Deqing 313200, China
*
Author to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 21 June 2018 / Accepted: 26 June 2018 / Published: 27 June 2018
(This article belongs to the Special Issue Multi-functional Polymer Composites and Structures)
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Abstract

In-situ pH-sensitive cellulose fibers (IS-pH-SCF) were prepared by anchoring bromothymol blue (BTB) onto cellulose fibers (CF) modified with hydroxypropyltriethylamine (HPTTL) groups. Fourier transform infrared and X-ray photoelectron spectrum analyses demonstrated that the HPTTL groups were grafted onto the CF. X-ray diffraction proved that cellulose I in the CF transformed into cellulose II after quaternization. Scanning electron microscopy suggested that the quaternized CF (QCF) surface was clean and uniformly ridged. The adsorption of BTB onto QCF was carried out via batch adsorption experiments. A kinetic study illustrated that the adsorption was a spontaneous process and described well by pseudo-second-order, Freundlich and Temkin isotherms. The activation energy for the BTB adsorption onto QCF was 52.89 kJ/mol, which proved that the BTB adsorption onto QCFs was chemically controlled. The pH response demonstrated that the IS-pH-SCF was highly sensitive to pH, with an obvious color change for pH 4 to 8. The release tests showed that BTB was anchored on QCFs and that no BTB was released. IS-pH-SCF has a potential use for indicating pH changes in food. View Full-Text
Keywords: cellulose fiber; cationic modification; anchoring; bromothymol blue; in-situ pH-sensitive cellulose fiber; cationic modification; anchoring; bromothymol blue; in-situ pH-sensitive
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cao, L.; Liang, T.; Zhang, X.; Liu, W.; Li, J.; Zhan, X.; Wang, L. In-Situ pH-Sensitive Fibers via the Anchoring of Bromothymol Blue on Cellulose Grafted with Hydroxypropyltriethylamine Groups via Adsorption. Polymers 2018, 10, 709.

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