Dual-cross network polymers by knitting method

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Bulk copolymerization of alkyl acrylates and cyclodextrin (CD) host monomers produced a single movable cross-network (SC). The CD units acted as movable crosslinking points in the obtained SC elastomer. Introducing movable crosslinks into a poly(ethyl acrylate/butyl acrylate) copolymer resulted in good toughness (Gf) and stress dispersion. Here, to improve the Young’s modulus (E) and Gf of movable cross-network elastomers, the bulk copolymerization of liquid alkyl acrylate monomer swelling in SC gave another type of movable cross-network elastomer with penetrating polymers (SCPs). Moreover, the bulk copolymerization of alkyl acrylate and the CD monomer in the presence of SC resulted in dual cross-network (DC) elastomers. The Gf of the DC elastomer with a suitable weight % (wt%) of the secondary movable cross-network polymer was higher than those of the SCP or SC elastomers.

a Single movable cross-network elastomers (SC elastomers), b single movable cross-network elastomers with penetrating polymer chains (SCP elastomers), and c dual movable cross-network elastomers (DC elastomers). d Proposed mechanical property map of the toughness and modulus of these elastomers.

Kawai, Y., Park, J., Ishii, Y. et al. Preparation of dual-cross network polymers by the knitting method and evaluation of their mechanical properties. NPG Asia Mater 14, 32 (2022). https://doi.org/10.1038/s41427-021-00348-2

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