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Phenomenological Changes in Lignin following Polymerization and its Effects on Flocculating Clay Particles.

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In present work, cationic kraft lignin (CKL) macromolecules were produced via polymerizing kraft lignin (KL) with [-2-(Acryloyloxy)ethyl] trimethyl ammonium chloride (ATAC) or [-2-(methacryloyloxy)ethyl] trimethyl ammonium methyl sulfate (METAM). Despite slightly… Click to show full abstract

In present work, cationic kraft lignin (CKL) macromolecules were produced via polymerizing kraft lignin (KL) with [-2-(Acryloyloxy)ethyl] trimethyl ammonium chloride (ATAC) or [-2-(methacryloyloxy)ethyl] trimethyl ammonium methyl sulfate (METAM). Despite slightly different charge densities (2.3-2.5 mmol/g) of CKL, lignin-METAM (KL-METAM) had a significantly larger molecular weight and radius of gyration. A correlation was observed between the structure of CKLs and their impacts on the surface hydrophilicity of kaolin particles. In interacting with kaolin particles, KL-METAM generated larger and stronger flocs with looser structures than did KL-ATAC. Compared to ATAC, METAM had one additional methyl substituent on its structure, which provided fundamental evidence on how a small group (i.e., a methyl group) on the structure of a cationic monomer can have a substantial influence on its polymerization with lignin and subsequently on the efficiency of the induced macromolecule as a flocculant in a kaolin suspension system.

Keywords: polymerization; lignin; metam; lignin following; changes lignin; phenomenological changes

Journal Title: Biomacromolecules
Year Published: 2019

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