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Title: A path for lignin valorization via additive manufacturing of high-performance sustainable composites with enhanced 3D printability

Journal Article · · Science Advances

Here, we report the manufacture of printable, sustainable polymer systems to address global challenges associated with high-volume utilization of lignin, an industrial waste from biomass feedstock. By analyzing a common three-dimensional printing process—fused-deposition modeling—and correlating the printing-process features to properties of materials such as acrylonitrile-butadiene-styrene (ABS) and nylon, we devised a first-of-its-kind, high-performance class of printable renewable composites containing 40 to 60 weight % (wt %) lignin. An ABS analog made by integrating lignin into nitrile-butadiene rubber needs the presence of a styrenic polymer to avoid filament buckling during printing. However, lignin-modified nylon composites containing 40 to 60 wt % sinapyl alcohol–rich, melt-stable lignin exhibit enhanced stiffness and tensile strength at room temperature, while—unexpectedly—demonstrating a reduced viscosity in the melt. Further, incorporation of 4 to 16 wt % discontinuous carbon fibers enhances mechanical stiffness and printing speed, as the thermal conductivity of the carbon fibers facilitates heat transfer and thinning of the melt. We found that the presence of lignin and carbon fibers retards nylon crystallization, leading to low-melting imperfect crystals that allow good printability at lower temperatures without lignin degradation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1489603
Journal Information:
Science Advances, Vol. 4, Issue 12; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 107 works
Citation information provided by
Web of Science

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Desirable plant cell wall traits for higher-quality miscanthus lignocellulosic biomass journal April 2019
An Ionomeric Renewable Thermoplastic from Lignin‐Reinforced Rubber journal April 2019
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Stereolithography 3D Printing of Lignin-Reinforced Composites with Enhanced Mechanical Properties journal November 2019
Strategy To Improve Printability of Renewable Resource-Based Engineering Plastic Tailored for FDM Applications journal November 2019
Desirable plant cell wall traits for higher-quality miscanthus lignocellulosic biomass journal April 2019