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Polymers 2018, 10(10), 1109; https://doi.org/10.3390/polym10101109

Study on the Effect of 1-Butanol Soluble Lignin on Temperature-Sensitive Gel

School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China
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Received: 14 August 2018 / Revised: 1 October 2018 / Accepted: 3 October 2018 / Published: 8 October 2018
(This article belongs to the Special Issue Lignin Polymers: Structures, Reactions and Applications)
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Abstract

A protocol for the fractionation of lignin with 1-butanol as solvent has been proposed in order to improve the utilization of industry alkali lignin. 1-butanol soluble lignin (BSL) was used as a building block for temperature-sensitive hydrogel with N-isopropylacrylamide (NIPAAm) through graft polymerization. The result shows that 1-butanol fractionation is an effective method to improve the molecular weight homogeneity of lignin (PDI, 2.5 to 1.83) and increase the hydroxyl group content (0.585–1.793 mmol/g). The incorporation of BSL into the temperature-sensitive hydrogel can enhance the thermal stability and increase the hydrophobicity of the gel, which leads to a decrease in lower critical solution temperature (LCST). In addition, the compression strength, swelling ratio, and pore size of the gel can be adjusted by the dosage of lignin. This stimuli-responsive gel, with an LCST around 32 °C, is expected to be applied in the agricultural field as a pesticide carrier by stimulating release and absorption properties based on the change in natural environmental temperature. View Full-Text
Keywords: 1-butanol; fractionation; industrial alkali lignin; temperature-sensitive gel 1-butanol; fractionation; industrial alkali lignin; temperature-sensitive gel
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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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Jiang, P.; Cheng, Y.; Yu, S.; Lu, J.; Wang, H. Study on the Effect of 1-Butanol Soluble Lignin on Temperature-Sensitive Gel. Polymers 2018, 10, 1109.

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