Structure and Property-focused Examination of Lignin-embedded Thermoplastic Polyurethane Composites
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초록
내용
Lignin is an abundant natural source of aromatic macromolecules, especially as a filler for polymer composite systems. A systematic study is essential to identify the key parameters of lignin that determine favorable interaction with the polymer matrix for the successful integration of lignin into polymers. Three different lignins, originating from various sources and recovery processes were selected and introduced into thermoplastic polyurethane as reinforcements through a melt mixing process. Extensive research elucidated that the aliphatic hydroxyl groups in the lignin structure play a key role in intermolecular hydrogen bond formation with the TPU matrix, influenced by the source and recovery methods. Hardwood lignin extracted via the hydrothermal process showed the highest aliphatic hydroxyl group content, resulting in remarkable thermal stability and increased mechanical properties. Tensile test results revealed a 58% enhancement in toughness compared to neat TPU, even with a minor addition of 0.5 vol%.