Abstract
In this work, graft copolymer poly (n-butyl acrylate)-g-polyacrylonitrile with poly (n-butyl acrylate) as backbones and polyacrylonitrile as side chains (PnBA-g-PAN) was synthesized by macromonomer method and emulsion polymerization. The macromonomer was synthesized by atom transfer radical polymerization and end-group modification. The chemical structures and thermal properties of macromonomer and graft copolymer were investigated by FTIR, GPC, NMR and TGA, etc. The mechanical properties of graft copolymer elastomer was also measured by uniaxial tensile test. Rheological properties at different temperature and mechanical property demonstrated that graft copolymer elastomer possessed elasticity until 180 oC because of cyclization of cyano groups. Ag nanowires@PnBA-g-PAN composite elastomer was developed, and the resulted material exhibited autonomic healing property on account of segments’ flexibility and dynamic interaction between Ag nanowires (AgNWs) and cyano groups. This is a general method for generation of elastomer with high temperature elasticity and fast self-healing. The composite elastomer has potential application in flexible electronic conductor.
Highlights
With the development of smart textiles, flexible electrodes play an important role in wearable and functional textiles (Åkerfeldt et al 2014)
Chemical structures of polymers The synthetic routes for PAN macromonomer and graft copolymer are shown in Scheme 1
The peak at 2246 cm−1 is assigned to stretching vibration of nitrile groups in Polyacrylonitrile with bromine end-group (PAN-Br) and PAN macromonomer (Shimada et al 1986)
Summary
With the development of smart textiles, flexible electrodes play an important role in wearable and functional textiles (Åkerfeldt et al 2014). Thermoplastic elastomers (TPEs) which have unique property of being spontaneously and thermoreversibly crossed-linked materials are widely used for a pyramid of important applications (Nian et al 2019; Hu et al 2019; Wang et al 2019). Block copolymer thermoplastic elastomers such as SBS and SIS with double bonds in the backbones are commercial and used in broad fields. The oxidation resistance is poor owing to the double bonds and it limits the application in high temperature. Developing elastomers with resistance to hydrocarbons and high temperature is significant for opening new applications in the automotive market (Dai et al 2020; Gopalan and Naskar 2019). The construction of self-healing elastomer materials has been driven by developments in materials science and flexible electronics with long lifetime and environmental sustainability (Xun et al 2020; Chen et al 2019)
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