Application of carboxylated ethylene/vinyl acetate copolymer-modified nanosilica in tire tread rubber
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ORIGINAL RESEARCH
Application of carboxylated ethylene/vinyl acetate copolymer‑modified nanosilica in tire tread rubber Yuan Tang1 · Qing‑feng Tian2,3 · Ya‑lan Liu2 · Yan‑peng Wang1,2,3 · Xiao‑hong Li2 · Zhi‑jun Zhang2 · Tao Ding1 Received: 2 February 2020 / Accepted: 7 July 2020 © Iran Polymer and Petrochemical Institute 2020
Abstract It is essential to keep the balance among rolling resistance, wet skid resistance and wear resistance (the so-called devil’s triangle) of tire treads so as to ensure the reliability and safety of the vehicles. For this purpose, hexamethyl-disiloxane (HMDS) and carboxylated polyethylene vinyl acetate copolymer (EVA, emulsion polymer latex) were used to modify nanosilica by in situ surface-modification method, thereby obtaining surface-capped nanosilica possessing good compatibility and strong interfacial interactions with rubber matrix. The surface-capped nanosilica of the above both modifications were introduced into the blend of solution polymerized styrene butadiene rubber (SSBR) and butadiene rubber (BR), and its effect on the mechanical properties and wear resistance of the SSBR/BR-matrix nanocomposites was investigated. The results indicated that both HMDS and EVA contribute to enhancing the compatibility and interfacial interactions of nanosilica with the rubber matrix, which is favorable for improving the mechanical properties and wear resistance of SSBR/BR-matrix nanocomposites. Particularly, HMDS can endow the rubber-matrix nanocomposites with increased wet skid resistance, and EVA can ensure the low rolling resistance of the nanocomposites. Therefore, the SSBR/BR blend filled with HMDS–SiO2–EVA possesses the desired mechanical properties and wear resistance and shows promising prospective as a candidate material for fabricating high-performance tire tread. Keywords Hexamethyldisiloxane · Carboxylated polyethylene vinyl acetate · Surface-capped nanosilica · Nanocomposite · Dynamic mechanical properties
Introduction Synthetic rubbers have no self-reinforcing ability, because their amorphous structure cannot undergo strain-induced crystallization as it does by natural rubber (NR) [1]. In this sense, it is essential to search potential fillers for improving the mechanical properties of synthetic rubbers * Xiao‑hong Li [email protected] * Tao Ding [email protected] 1
College of Chemistry and Chemical Engineering, Engineering Laboratory of Flame Retardant and Functional Materials, Henan University, Kaifeng 475000, Henan, China
2
Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475000, Henan, China
3
National and Local Joint Engineering Research Center for Applied Technology of Nano-Hybrid Materials, Jiyuan 459000, Henan, China
such as solution-polymerized styrene butadiene rubber (SSBR) and butadiene rubber (BR), which have been widely applied in tire tread industry for decades. Nanosilica (nano-SiO2) has rich sources, is non-toxic, and has important applications in both thermoplastic elastomers and thermosetting elastomers [
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