As the lignin ratio increased from 0 to 20%, the σ ρ and E ρ of RPU foams showed a trend of increasing values.
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Effects of Surface Functionalization of Lignin on Synthesis and Properties of Rigid Bio-Based Polyurethanes Foams.
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The sentences
The maximum mass loss rate (DTG-max) also showed a decreasing trend as lignin content in the foams increased.