Thermal properties of epoxy resins crosslinked by an aminated lignin |
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| Authors: | Hong Pan Gang Sun Tao Zhao Gehui Wang |
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| Affiliation: | 1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, People's Republic of China;2. Division of Textiles and Clothing, University of California, Davis, California;3. Donghua Research Institute, Donghua University, Shanghai, People's Republic of China;4. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, People's Republic of China;5. Fashion Art Design Institute, Donghua University, Shanghai, People's Republic of China |
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| Abstract: | Aminated lignin possessing significant amount of reactive amino groups was studied as a curing agent of epoxy resin. Fourier transform infrared spectroscopy results proved the reactivity of the aminated lignin with the epoxy resin. Both appearance features and scanning electron microscopy images indicated that the transparent and homogeneous epoxy resin films could be formed with the aminated lignin less than 40% in the hardener mixture. In addition, thermogravimetric analysis and dynamic thermomechanical analysis results revealed that the epoxy resin cured by aminated lignin had better thermal stability compared with ones cured by a common hardener. The mass loss of the epoxy resin cured by the aminated lignin before 300°C was small around only 2.5%. The Tg (the glass transition temperature) of epoxy resin sample after cured by mixed hardener increased from 79°C to 93°C. The obvious difference (70–84°C) of Td (the thermal deformation temperature) was also observed from the samples with and without the aminated lignin after cured at a high temperature. POLYM. ENG. SCI., 55:924–932, 2015. © 2014 Society of Plastics Engineers |
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