Purification of Monomers Leads to High-Quality Lignin Macromonomers

Abstract

Purification is critical in any chemical process. The removal of impurities will produce the product in better quality and high standard. In this study, a new type of monomer was prepared by condensation polymerization of alkali lignin (AL) and methacryloyl chloride (MAC). The effect of AL/MAC ratio and the purification of MAC were investigated. The physical and chemical properties of the product obtained which is lignin methacrylate (LMA) were characterized by Fourier Transformed Infrared spectroscopy (FT-IR) and Nuclear Magnetic Resonance (1H-NMR). The result reveals that the purification was successfully removed the hydroxyl groups from the stabilizer in MAC and it is found that all the hydroxyl groups are coming from AL. The single interaction between AL and MAC has successfully enhanced the product obtain which does show no hydroxyl groups. The 1H-NMR data also showed that the purification of MAC influences the outcome. The noise and impurities were eliminated after the purification of MAC, and more pure products were obtained. This new monomer (LMA) synthesis that can be further utilized for various applications.

An Affordable and Easily Accessible Approach for Acrylonitrile Monomer Purification through a Simple Column Technique

“…Researchers are increasingly interested in altering polymers into added-value products, especially in energy storage and conversion. Copolymerization, grafting, and crosslinking are all ways to change some properties of the host polymer, and they all need monomers as one of the reactants [3] [6]. As is well known, stabilizers are added to liquid monomers like styrene, acrylonitrile, vinyl chloride-d3, methyl acrylate, acryloyl chloride, 2-chloroethyl vinyl ether, etc., in the form of 4-tert-butylcatechol (TBC), 35 -45 ppm monomethyl ether hydroquinone (MeHQ), and 400 ppm phenothiazine (PTZ) to prevent the monomers from self-polymerizing or being started by light, heat, or air.…”