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Polymers 2018, 10(7), 743;

Preparation and Characterization of Softwood Kraft Lignin Copolymers as a Paper Strength Additive

State Key Laboratory of Biobased Material and Green Papermaking, Key Laboratory of Pulp & Paper Science and Technology of Shandong Province/Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Xuancheng Product Quality Supervision and Inspection Institute, Xuancheng 242000, China
Authors to whom correspondence should be addressed.
Received: 10 June 2018 / Revised: 29 June 2018 / Accepted: 3 July 2018 / Published: 5 July 2018
(This article belongs to the Special Issue Lignin Polymers: Structures, Reactions and Applications)
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Softwood kraft lignin is a renewable type of woody material that can be converted to value-added products, for example, as a paper strength additive in the paper industry. In this study, the monomers of methacryloxyethyltrimethyl ammonium chloride (DMC), acrylic acid (AA), and acrylamide (AM) were grafted on softwood kraft lignin (SKL) to prepare three different SKL copolymers. Fourier-transform infrared, proton nuclear magnetic resonance, charge density, elemental, and molecular weight analyses confirmed that the monomers were successfully grafted onto SKL. The grafting rates of SKL-DMC, SKL-AA, and SKL-AM copolymers were 80.35%, 82.70%, and 79.48%, respectively. The application of SKL copolymers as a paper additive for enhancing paper physical properties was studied. The results indicated that at a 2 wt % dosage of SKL copolymers, the increase in the physical properties of paper is maximum. View Full-Text
Keywords: softwood kraft lignin (SKL); SKL copolymers; paper additive; physical properties softwood kraft lignin (SKL); SKL copolymers; paper additive; physical properties

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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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Liu, Z.; Xu, D.; Xu, L.; Kong, F.; Wang, S.; Yang, G. Preparation and Characterization of Softwood Kraft Lignin Copolymers as a Paper Strength Additive. Polymers 2018, 10, 743.

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