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

Liu, Zhongming; Xu, Dingding; Xu, Lei; Kong, Fangong; Wang, Shoujuan; Yang, Guihua

doi:10.3390/polym10070743

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

by

Zhongming Liu

¹,

Dingding Xu

¹,

Lei Xu

²,

Fangong Kong

^1,*,

Shoujuan Wang

^1,* and

Guihua Yang

¹

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

²

Xuancheng Product Quality Supervision and Inspection Institute, Xuancheng 242000, China

^*

Authors to whom correspondence should be addressed.

Polymers 2018, 10(7), 743; https://doi.org/10.3390/polym10070743

Submission 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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Abstract

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.

Keywords: softwood kraft lignin (SKL); SKL copolymers; paper additive; physical properties

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MDPI and ACS Style

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. https://doi.org/10.3390/polym10070743

AMA Style

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(7):743. https://doi.org/10.3390/polym10070743

Chicago/Turabian Style

Liu, Zhongming, Dingding Xu, Lei Xu, Fangong Kong, Shoujuan Wang, and Guihua Yang. 2018. "Preparation and Characterization of Softwood Kraft Lignin Copolymers as a Paper Strength Additive" Polymers 10, no. 7: 743. https://doi.org/10.3390/polym10070743

APA Style

Liu, Z., Xu, D., Xu, L., Kong, F., Wang, S., & Yang, G. (2018). Preparation and Characterization of Softwood Kraft Lignin Copolymers as a Paper Strength Additive. Polymers, 10(7), 743. https://doi.org/10.3390/polym10070743

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

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