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ORIGINAL CONTRIBUTION

Preparation of graphene quantum dots modified hydrogenated carboxylated nitrile rubber interpenetrating cross-linked film Fei Xie 1 & Zhiwei Yang 1 & Enyun Xu 1 & Liqun Zhang 1,2 & Dongmei Yue 1,2 Received: 30 April 2020 / Revised: 9 July 2020 / Accepted: 24 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract In this paper, an amino-rich graphene quantum dots (GQDs) were efficiently prepared. Hydrogenated carboxylated nitrile latex (HXNBR) was prepared by hydrogenation of carboxylated nitrile latex (XNBR) by residual hydrazine hydrate during the preparation of GQDs, and a large amount of amino groups on the GQDs were reacted with carboxyl groups on the XNBR. Hence, a novel-interpenetrating network HXNBR film containing GQDs was successfully prepared. The physical properties and aging resistance of the films were investigated. The composite films have ultraviolet-visible excited fluorescence. By comparing the fluorescence of the films, it was confirmed that HXNBR grafting of GQDs to form an interpenetrating network enables GQDs to be well dispersed in the matrix. Keywords Quantum dots . Hydrogenated nitrile rubber . Fluorescence . Polymer interpenetrating network

Introduction The hydrogenated nitrile rubber is obtained by hydrogenation of a nitrile rubber, which has higher heat resistance and better aging resistance while maintaining the oil resistance of the nitrile rubber [1–3]. The solution hydrogenation and latex hydrogenation are the major preparation methods. The solution hydrogenation process is complicated and required harsh reaction conditions and precious metal catalysts, resulting in a high cost of HNBR [4]. The latex hydrogenation refers to the direct hydrogenation of the unsaturated chain segment in the latex state that is relatively simple, and the cost is low [5, 6]. It was reported that the diimide produced by hydrazine hydrate and the rapid addition of carbon-carbon double bonds of NBR has high hydrogenation degree [7]. However, the product contained lots of gel, which limited its application [8]. It was also reported that self-cross-linking HXNBR films can be produced by cross-linking of the system by latex [9]. It can

* Dongmei Yue [email protected] 1

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

2

Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, China

be functionalized to improve physical and mechanical properties further [10, 11]. In recent years, fluorescent polymers were reported to achieve functions such as fluorescence [12]. Fluorescent polymers can be used in radiation measurement, flexible display, etc. Most of the traditional rubber is made with rare-earth elements [13, 14]. Recently, it was reported in the literature that cerium- and europium-doped LaF3 nanoparticles can be mixed with rubber, using different rare-earth dopants and proportions to achieve specific emission patterns, for different appl