Self-healing properties of poly(ethylene-co-vinyl acetate)
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Poly(ethylene-co-vinyl acetate) with 42 wt% of vinyl acetate shows autonomic self-healing at room temperature without macroscopic flow. Intermolecular diffusion of amorphous chains through the jointed boundary, which occurs because of the large amount of amorphous chains with low glass transition temperature, is responsible for the healing phenomenon. Furthermore, the healing efficiency is found to be enhanced when the separated pieces are recombined immediately after cutting. This result indicates that the cut surface has marked molecular mobility owing to the destruction of crystallites during the cutting process, which is supported by differential scanning calorimetry (DSC) measurements. The marked molecular mobility at the surface is, however, observed only for a short period after cutting, because further crystallization after cutting restricts the molecular motion.
KeywordsEthylene-co-vinyl acetate copolymer Self-healing Rheology Crystallinity
This work was promoted by COI program “Construction of next-generation infrastructure system using innovative materials”—realization of safe and secure society that can coexist with the Earth for centuries—supported by the Japan Science and Technology Agency (JST). Further, a part of this study was supported by Grand-in-Aid for Scientific Research No. 25410221.
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Conflict of interest
The authors declare that they have no competing interests.
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