The present investigation includes extraction of lignin from different biomass resources like flax fiber, alfalfa, wheat straw, and pine straw using organosolv treatment which was then characterized through FT-IR, DSC and TGA testing methods. FT-IR spectra showed homogeneity in the chemical structure of extracted lignin samples with treatments of organic solvents.
It was found that lignin obtained from alfalfa fiber provided the greatest yield of the various sources.
The extracted lignin’s thermal properties were observed using DSC and TGA.
DSC was used to observe the heat of reaction of lignin samples.
Enthalpy measurements were higher for lignin from flax fiber and alfalfa at 190.57 and 160.90 J/g, respectively.
The source of the lignin samples was seen to affect the thermal properties.
TGA was used to observe the degradation of biomass.
Overall, lignin extracted from wheat straw had the greatest thermal stability and highest char yield of 40.41% followed
by flax fiber (39.22%), alfalfa (35.04%), and pine straw (29.45%).
The increase in thermal degradation allows char to be formed on the surface which keeps the underling layers from getting burnt.
Hence, providing a greater char yield overall proves that the lignin samples have great fire resistant properties which can be attributed to their chemical structure which can provide enhanced thermal properties when they are used as partial replacements in phenolic resin systems.
The present investigation includes extraction of lignin from different biomass resources like flax fiber, alfalfa, wheat straw, and pine straw using organosolv treatment which was then characterized through FT-IR, DSC and TGA testing methods. FT-IR spectra showed homogeneity in the chemical structure of extracted lignin samples with treatments of organic solvents.It was found that lignin obtained from alfalfa fiber provided the greatest yield of the various sources. The extracted lignin’s thermal properties were observed using DSC and TGA. DSC was used to observe the heat of reaction of lignin samples. Enthalpy measurements were higher for lignin from flax fiber and alfalfa at 190.57 and 160.90 J/g, respectively. The source of the lignin samples was seen to affect the thermal properties. TGA was used to observe the degradation of biomass. Overall, lignin extracted from wheat straw had the greatest thermal stability and highest char yield of 40.41% followedby flax fiber (39.22%), alfalfa (35.04%), and pine straw (29.45%). The increase in thermal degradation allows char to be formed on the surface which keeps the underling layers from getting burnt. Hence, providing a greater char yield overall proves that the lignin samples have great fire resistant properties which can be attributed to their chemical structure which can provide enhanced thermal properties when they are used as partial replacements in phenolic resin systems.
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