Synthesis of Renewable Thermoset Polymers through Successive Lignin Modification Using Lignin-Derived Phenols [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 630.9 28 Agriculture and related technologies
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017
• Mô tả vật lý: Size: p. 5059-5066 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 263238
• Chủ đề: 1. 09 biomass fuels; 2. 37 inorganic, organic, physical, and analytical chemistry; 3. Biofuels (including algae and biomass); 4. Catalysis (heterogeneous); 5. Catalysis (homogeneous)

Tóm tắt

An approach to lignin-based epoxy networks from both organosolv lignin and lignin derived phenol (dihydroeugenol) are developed using multiple chemical modifications including demethylation, phenolation and phenol-formaldehyde reaction. Structures of lignin incorporated novolac polyphenols (LINPs) and epoxy networks (LINENs) were characterized using proton nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy. Compared to a common synthesis route in which lignin was epoxidized prior to blend with comonomers (LBEN), LINEN derivatives exhibited improved crosslink density ($?$), $?$-relaxation temperature ($T_?$) and storage modulus in glassy region ($E_g'$) as obtained from dynamic mechanical analysis (DMA), and increased thermal stability measured by thermogravimetric analysis (TGA). This study widens the routes of lignin modification. Renewable epoxy networks derived from both lignin and lignin derivatives are economically and ecologically attractive.