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Sci Bull (Beijing)

Title:		Design of next-generation cross-linking structure for elastomers toward green process and a real recycling loop
Author(s):		Zhang G; Feng H; Liang K; Wang Z; Li X; Zhou X; Guo B; Zhang L;
Address:		"Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: xinxinzhou@mail.buct.edu.cn. Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, China. Electronic address: psbcguo@scut.edu.cn. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: zhanglq@mail.buct.edu.cn"
Journal Title:		Sci Bull (Beijing)
Year:		2020
Volume:		20200310
Issue:		11
Page Number:		889 - 898
DOI:		10.1016/j.scib.2020.03.008
ISSN/ISBN:		2095-9281 (Electronic) 2095-9273 (Linking)
Abstract:		"Currently adopted cross-linking methods in rubber industry are suffering from variable persistent issues, including the utilization of toxic curing packages, release of volatile organic compounds (VOCs) and difficulties in the recycling of end-of-life materials. It is of great importance to explore a green cross-linking strategy in the area. Herein, we report a new 'green' strategy based on hydrolyzable ester cross-links for cross-linking diene-typed elastomers. As a proof of concept, a commercial carboxylated nitrile rubber (XNBR) is efficiently cross-linked by a bio-based agent, epoxidized soybean oil (ESO), without any toxic additives. ESO exhibits an excellent plasticization effect and excellent scorch safety for XNBR. The cross-linking density and mechanical properties of the ESO-cured XNBR can be manipulated in a wide range by changing simply varying the content of ESO. In addition, zinc oxide (ZnO) performs as a catalyst to accelerate the epoxide opening reaction and improve the cross-linking efficiency, serving as reinforcement points to enhance the overall mechanical properties of the ESO-cured XNBR. Furthermore, the end-of-life elastomer materials demonstrate a closed-loop recovery by selectively cleaving the ester bonds, resulting in very high recovery of the mechanical performance of the recycled composites. This strategy provides an unprecedented green avenue to cross-link diene elastomers and a cost-effective approach to further recycle the obtained cross-linked elastomers at high efficiency"
Keywords:		Carboxylated rubber Epoxidized soybean oil Green cross-linking Recycling;
Notes:		"PubMed-not-MEDLINEZhang, Ganggang Feng, Haoran Liang, Kuan Wang, Zhao Li, Xiaolin Zhou, Xinxin Guo, Baochun Zhang, Liqun eng Netherlands 2020/06/15 Sci Bull (Beijing). 2020 Jun 15; 65(11):889-898. doi: 10.1016/j.scib.2020.03.008. Epub 2020 Mar 10"