A Study of the Structural Properties of Lignin in Lignin-Containing Thermoplastic Polyurethane Composites
발표자
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초록
내용
Three distinct types of lignin, obtained from a variety of sources (softwood and hardwood) and extraction procedures (kraft and hydrothermal), were used to produce polymer composites with thermoplastic polyurethane (TPU) through a melt mixing process. Based on studies that focus on structure and properties, we conclude that the preservation of hydroxyl groups in lignin enhances the favorable interaction with the TPU matrix. The hardwood lignin extracted through a hydrothermal process (HW-HT) showed the highest hydroxyl conservation, as quantified by 31P Nuclear Magnetic Resonance (NMR), with a value of 6.03 mmol/g. A low addition of 0.5 vol% of HW-HT to the neat TPU resulted in a 58% increase in toughness. Additionally, the thermomechanical properties were shown to be improved in TPU composites containing low concentrations of lignin.