Preparation of high-damping soft elastomer based on Eucommia ulmoides gum
- 12 Downloads
This paper focus on the nature of a high-damping soft elastic material based on Eucommia ulmoides gum (EUG) obtained by epoxidation of EUG first and then in situ reaction between epoxy group and sodium bisulfite. The influence of degree of modification (M mol%) and degree of sulfonation (S mol%) of the product sulfonated E. ulmoides gum (SEUG) on the melting–crystallization behavior, tensile properties and dynamic mechanical properties is analyzed mainly. The results show that M mol% is the key factor in controlling the aggregation structure and static or dynamic mechanical behavior of SEUG, while the introduced sodium bisulfite groups show strengthening and toughening effect to some extent. Besides, the SEUG with high M mol% shows dramatically high tanδ value. With M mol% increasing, the tensile strength and Shore A hardness of SEUG decrease sequentially, while the elongation at break increases visibly. SEUGs with M mol% above 20.3 display soft and elastic stress–strain behavior. At similar M mol% level, SEUG with higher S mol% shows higher tensile strength and lower elongation at break than the one with lower S mol% value. These are attributed to the transformation of the aggregate structure and the introduction of ion interaction. The maximum tanδ value of SEUG reaches up to 2.19. The removal of the restriction effect of crystal region on the molecular motion of amorphous and the increased intermolecular interaction are thought to be main causes.
KeywordsSulfonation Epoxidation Eucommia ulmoides gum Degree of modification Degree of sulfonation Damping
The authors gratefully appreciate financial support supplied by the National Key Research and Development Program of China (No. 2017YFB0306902) and the Opening subject of Key Laboratory of Synthetic Rubber of Chinese Academy of Sciences (No. KLSR201702).
- 2.Zhang J, Xue Z (2011) A comparative study on the properties of Eucommia ulmoides gum and synthetic trans-1,4-polyisoprene. Polym Test 30(7):753–759. https://doi.org/10.1016/j.polymertesting.2011.06.010 CrossRefGoogle Scholar
- 4.Yan R (2007) Insight into materials engineering of Eucommia ulmoides gum. In: International Symposium on Eucommia ulmoides, vol 1, pp 34–37. https://doi.org/10.3387/iseu.1.34
- 6.Zhang J, Li X, Xue Z, Yan R (2007) Modification of three general rubbers by Eucommia ulmoides resin. In: International symposium on Eucommia ulmoides, vol 1, pp 123–125. https://doi.org/10.3387/iseu.1.123
- 8.Yang F, Meng X, Yu H (2017) Synthesis and characterization of butyl methacrylate grafted on Eucommia ulmoides gum. Polym Mater Sci Eng 33(4):19–24. https://doi.org/10.16865/j.cnki.1000-7555.2017.04.004 Google Scholar