Rheology of Polyacrylonitrile/Lignin Blends in Ionic Liquids under Melt Spinning Conditions

Autor:	Jinxue Jiang, Birgitte Kiær Ahring, Keerthi Srinivas, Andrew Geda, Alper Kiziltas
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	biorefinery lignin Chemical Phenomena Acrylic Resins Pharmaceutical Science Ionic Liquids 02 engineering and technology 010402 general chemistry dynamic rheology 01 natural sciences Chloride Lignin Article Analytical Chemistry lcsh:QD241-441 chemistry.chemical_compound lcsh:Organic chemistry Carbon Fiber Drug Discovery polyacrylonitrile medicine Physical and Theoretical Chemistry Spinning ionic liquid Spectrum Analysis Organic Chemistry Butyric anhydride Plasticizer Polyacrylonitrile 021001 nanoscience & nanotechnology 3. Good health 0104 chemical sciences chemistry Chemical engineering Chemistry (miscellaneous) Ionic liquid Molecular Medicine Melt spinning 0210 nano-technology Rheology medicine.drug
Zdroj:	Molecules Volume 24 Issue 14 Molecules, Vol 24, Iss 14, p 2650 (2019)
ISSN:	1420-3049
Popis:	Lignin, while economically and environmentally beneficial, has had limited success in use in reinforcing carbon fibers due to harmful chemicals used in biomass pretreatment along with the limited physical interactions between lignin and polyacrylonitrile (PAN) during the spinning process. The focus of this study is to use lignin obtained from chemical-free oxidative biomass pretreatment (WEx) for blending with PAN at melt spinning conditions to produce carbon fiber precursors. In this study, the dynamic rheology of blending PAN with biorefinery lignin obtained from the WEx process is investigated with the addition of 1-butyl-3-methylimidazolium chloride as a plasticizer to address the current barriers of developing PAN/lignin carbon fiber precursors in the melt-spinning process. Lignin was esterified using butyric anhydride to reduce its hydrophilicity and to enhance its interactions with PAN. The studies indicate that butyration of the lignin (BL) increased non-Newtonian behavior and decreased thermo-reversibility of blends. The slope of the Han plot was found to be around 1.47 for PAN at 150 ° C and decreased with increasing lignin concentrations as well as temperature. However, these blends were found to have higher elasticity and solution yield stress (47.6 Pa at 20%wt BL and 190 ° C) when compared to pure PAN (5.8 Pa at 190 ° C). The results from this study are significant for understanding lignin&ndash PAN interactions during melt spinning for lower-cost carbon fibers.
Databáze:	OpenAIRE
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