Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 7, Pages 8816-8825Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b01170
Keywords
Lignin; Polyurethane; Carbon fibers; Thermal properties; Biopolymers
Categories
Funding
- BioBased Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation programme [720707]
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The production of carbon fibers based on lignin reduces the cost and the environmental impact associated with carbon fiber manufacturing. However, the melt processing of lignin as a carbon fiber precursor is challenging due to its brittleness and limited thermoplastic behavior. For this reason we produce biopolymer blends based on Alcell organosolv hardwood lignin, hydroxypropyl modified Kraft hardwood, and a thermoplastic elastomer polyurethane (TPU). Samples with TPU content greater than 30% showed excellent melt processability and carbonization yield (35% carbon yield for the samples containing 30% of TPU). The thermal properties were analyzed by differential scanning calorimetry, rheology and thermogravimetric analysis. Fourier infrared measurements were utilized to explain the lignin/TPU interactions which governed the thermal and rheological behavior of the blends. SEM analysis showed that the blends produce a homogeneous structure which was void free after carbonization. These structurally complementary biopolymeric blends should open up new avenues for lignin valorization and bring closer the realization of the production of carbon fibers from biosources.
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