Using facile one-pot thiol-ene reaction to prepare elastomers filled with silica
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ORIGINAL PAPER
Using facile one‑pot thiol‑ene reaction to prepare elastomers filled with silica Haifeng Kuang1 · Qiyan Yin1,2 · Ruyi Zhang1 · Penghan Wang1 · Kai Gou1 · Huan Chen1,2 · Chenghao Dai1,2 · Gengsheng Weng1,2 Received: 16 April 2020 / Accepted: 18 September 2020 © The Polymer Society, Taipei 2020
Abstract Novel elastomers filled with different contents of silica through a two-step one-pot thiol-ene reaction were reported. Two monomers of poly (ethylene glycol) dimethacrylate and 1,6-hexanedithiol were used in the first step to synthesize a vinylterminated prepolymer at room temperature. In the second step, silica and chemical cross-linker trimethylolpropane tris(3mercaptopropionate) were directly added to the prepolymer in sequence and transparent elastomers were obtained in 30 min at room temperature. The cross-linking kinetics and mechanical properties in the presence of different contents of silica were investigated in detail by rheological, tensile and cyclic loading measurements. It was found that silica had a significant reinforcing effect on the mechanical properties of the elastomers. Our synthetic method is simple, solvent-free and energyand cost-efficient. Our findings pave a new way to fabricate novel sulfur-containing elastomers using thiol-ene chemistry. Keywords Thiol-ene reaction · Cross-linking · Elastomer · Silica · Mechanical reinforcement
Introduction Chemically cross-linked polymeric elastomers are highly stretchable and almost incompressible materials that have been extensively used in many applications and products, such as the treads of vehicle tires, shock absorbers and surgeon’s gloves [1–4]. As to the fabrication of those elastomers, cross-linking, or known as vulcanization is of vital importance, since the most important properties of elastomers including high elasticity, modulus and strength are determined by cross-linking [5–10]. To construct chemically cross-linked elastomers, the general choice is the using of sulfur or peroxides as cross-linkers [11–17]. However, complicated compounding steps and formulations are needed Haifeng Kuang and Qiyan Yin are equally contributed to this work. * Gengsheng Weng [email protected] 1
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
Ningbo Key Laboratory of Specialty Polymers, State Key Laboratory Base of Novel Functional Materials and Preparation Science, Ningbo University, Ningbo 315211, China
2
and high temperature vulcanization is required. Therefore, facile and energy-efficient fabrication strategies for polymeric elastomers are highly desired. As a typical click chemistry reaction, the thiol-ene reaction has gained prominence for its valuable advantages, including high yield, stereoselectivity, high reaction rate and mild reaction conditions [18–24]. Due to the advantages mentioned above, the thiol-ene reaction has received wide range of applications in materials and biomedical sciences. For example, the thiol-ene reaction can be used to prepare highly transparent
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