Abstract
Commercial Kraft lignin was successfully valorized into recyclable and flexible polyester thermosets. Kraft lignin was first processed into more well-defined lignin fractions via liquid-solid extra ...
Highlights
Lignin, as the most abundant terrestrial aromatic polymer, accounts for 30% of nonfossil organic carbon on Earth.[1]
Two thermosets were based on lignin fractions from liquid−solid extraction with methanol or ethanol, and two thermosets were based on lignin fractions from microwave processing (MwP) in ethanol at two different temperatures
Flexible and recyclable polyester thermosets were successfully fabricated by utilizing refined lignin fractions derived from liquid−solid extraction or MwP of Kraft lignin
Summary
As the most abundant terrestrial aromatic polymer, accounts for 30% of nonfossil organic carbon on Earth.[1]. Our group developed a combined microwave-assisted extraction/degradation process for producing high yields of narrow-dispersity lignin fractions with low molecular weight.[37] For example, the liquid−solid extraction with ethanol at room temperature (RT) with one or two extractions typically resulted in a yield of 37−48%.5,17,19. The microwave processing (MwP) in ethanol could increase the extraction yield to 64% while the molecular weight and dispersity remained similar.[37] it is important to investigate whether the MwP influences the reactivity of the lignin fractions during thermoset synthesis as well as the final material properties and recyclability of the resulting lignin-based thermosets compared to the thermosets produced from the original lignin or lignin fractions from liquid−solid extraction. The weight loss of lignin and the water content of the thermosets were tested using the same instrument by heating isothermally at 110 °C for 1 h
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