POLYMERS AND POLYMER MATRIX COMPOSITES |
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Synthesis of High-Ortho Novolak Resins from Liquefied Products of Walnut Shell |
LU Yuhan, HUANG Yuanbo, YANG Xiaoqin, XU Kaimeng, LIU Can, ZHANG Quan, WANG Jida, ZHENG Zhifeng
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Yunnan Provincial International Joint Research Center for Bioenergy, Yunnan Provincial Engineering Laboratory for Highly-Efficient Utilization of Biomass, Yunnan Provincial University Key Laboratory for Biomass Chemical Refinery & Synthesis,School of Materials Science & Engineering, Southwest Forestry University, Kunming 650224 |
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Abstract Walnut shell bio-based high-ortho novolak resins were synthesized by using liquefied products of walnut shell as raw material and zinc hydroxide as catalyst, their structure and thermal property were characterized by nuclear magnetic resonance spectroscopy (NMR), fourier transforming infrared spectrum (FT-IR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA) and organic elements analysis (OEA). Results demonstrated that walnut shell bio-based high-ortho novolak resins can be synthesized by two-step addition of formaldehyde method, their long chain structure was consisted of phenol rings which linked with methylene by ortho-ortho connection (o-o), ortho-para connection (o-p), and para-para connection (p-p), in particular, structures of phenol rings with methylene by o-o and o-p were dominant, and the ratio of phenol rings with methylene by o-o to p-p were 1.22. Their number-average molecular weight was 4 499 g/mol, polydispersity index was 1.417. And their heat loss process included two stages which the maximum weight loss temperature was 375 ℃ with weight loss rate of 50%. According to OEA, their theoretical formula was C6H6O1.2.
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Published: 18 October 2018
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