期刊
EUROPEAN POLYMER JOURNAL
卷 117, 期 -, 页码 200-207出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2019.05.028
关键词
Lignin; Biomass; Renewable resources; Cyclic acetal; Recycle
资金
- National Natural Science Foundation of China [51773216, 51603221]
- Youth Innovation Promotion Association, CAS [2018335]
- Chinese MIIT Special Research Plan on Civil Aircraft [MJ-2015-H-G-103]
- National Key Research and Development Program of China [2017YFE0102300]
Thermosets are very versatile owing to their high dimensional stability, chemical resistance and thermal and mechanical properties; however, they are difficult to be recycled or reworked because of their permanent cross-linked structure. In this paper, we synthesized a novel fully bio-based diepoxy monomer via acetalization of lignin derivative vanillin with bio-based polyol erythritol followed by reacting with bio-derived epichlorohydrin. Due to the degradability of dicyclo diacetal structure in the diepoxy monomer, the cross-linked epoxy network could be readily decomposed (completely dissolved in 1 M HCl solution at 50 degrees C within 40 min). While it was stable under neutral and basic conditions even during hot-humid aging test. Meanwhile, due to the rigidity of the dicyclo diacetal structure, it showed high glass transition temperature of 184 degrees C, and its modulus (4.7 GPa) and hardness (0.30 GPa) are even higher than those of conventional bisphenol A epoxy resin.
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