Even though considerable efforts have been applied toward self-healing materials, construction of a reversible network in a nonpolar elastomer with a high strength and self-healing behavior is still a considerable challenge. Herein, a novel method to construct a dual ionic network for natural rubber (NR)-based carboxylate ionomers with a high self-healing efficiency through an anionic mechanism is demonstrated. Maleic anhydride (MAH) was grafted with NR by an anionic mechanism to construct the first ionic network, with n-butyllithium as the metallization reagent. Subsequently, zinc dimethacrylate (ZDMA) reacted with the MAH-modified NR, and the second ionic network was constructed. Additionally, scanning electron microscopy analyses showed that the grafting of MAH improved the dispersity of ZDMA in NR, resulting in a stronger reinforcing effect. Compared to the reported ZDMA-based self-healing elastomers, the dual ionic network exhibited a better reinforcing effect with a high self-healing efficiency of 75% in full-cut mode. This concept offers a novel inspiration to design high-performance self-healing elastomers.
Abstract. Size control of silver nanoparticles (Ag NPs) to improve monodispersity and recyclability is crucial for application in nanocatalysts. Hence, a novel and effective protocol for in-situ synthesis of Ag NPs in the microemulsion was proposed. The surfactant-stabilized microcavity in microemulsion can provide a nanoscale reactor that limits nucleation, growth, and agglomeration of the particles. Ag NPs of 540-640 nm were successfully grown and exhibited excellent catalytic activity with the apparent rate constant (k) of 0.59 min -1 and the activation energy (Ea) of 23.03 kJ mol -1 toward the reduction of 4-nitrophenol. Moreover, the catalyst could be easily recycled and showed excellent reusability after 6 cycles. So, the silver nanoparticles can be extended to an important metalcatalyzed reduction in chemical industry, which is of great significance for the sustainable development.Keywords: Silver nanoparticles, microemulsion, 4-NP, catalytic [22]. Especially, microemulsion synthesis has been demonstrated to be a very promising method due to its precise control on morphology and dimension of nanoparticles [22]. From the viewpoints of colloid and interface chemistry, there are two types of microemulsions, reversed (water/oil) and direct (oil/water) microemulsion [23][24][25]. These systems are transparent, isotropic liquid media composed of discrete, thermodynamically stable [20]. The surfactant-stabilized microcavity in microemulsion can provide a nanoscale reactor that limits nucleation, growth, and agglomeration of the particles [22]. Accordingly, we could use this method to get Ag NPs with a controlled dimension. IntroductionAs we all know that 4-nitrophenol (4-NP) shows one of the most notorious toxic pollutants in the industrial effluents [26]. 4-aminophenol (4-AP) is very useful and important in many applications including analgesic and antipyretic drugs, photographic development, corrosion inhibition, anticorrosion lubrication, hair-dyeing agent etc [27]. Therefore enormous current interests have arisen in the development of catalysts for reduction of the 4-NP to 4-AP [28][29][30]. Traditional methods for this process usually involve reduction/catalytic hydrogenation [31][32][33][34][35]. Considering these aspects, sizecontrolled synthesis of Ag NPs for 4-NP transformations in a simple, cost-effective, and selective manner is highly demanding [26].We herein report our new efforts to synthesize Ag nanoparticles by the microemulsion method. Through our research, most of catalysts were alloy or compound of silver nanoparticles traditionally. A single metal of Ag NPs were manufactured in our work through a simple and fast method. In this system, o-phenylenediamine (oPD) was used as a weak reductive agent, who has been employed to produce silver
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.