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A novel multi-triggered reversible shape memory thermoplastic polyurethane blend

Lai, Sun-Mou ; Lin, Ting-Yu ; Huang, Guan-Lin

Journal of polymer research, 2023-02, Vol.30 (2) [Periódico revisado por pares]

Springer

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  • Título:
    A novel multi-triggered reversible shape memory thermoplastic polyurethane blend
  • Autor: Lai, Sun-Mou ; Lin, Ting-Yu ; Huang, Guan-Lin
  • Assuntos: Polyurethanes ; Small and medium sized companies
  • É parte de: Journal of polymer research, 2023-02, Vol.30 (2)
  • Descrição: The shape memory properties of thermoplastic polyurethane (TPU)/polycaprolactone (PCL) based blends were studied. In the literature, most two-way shape memory polymers under stress-free conditions were prepared using single polymer or copolymer networks, and rare studies focused on the simple elastomer/plastic blend systems, particularly on the solvent vapor-triggered cases. For the two-way shape memory effect (SME), the entropy-induced elongation was found to be quite significant, not just the crystallization-induced elongation for the developed blends under large external load. Regarding vapor-triggered TPU/PCL blends (polar/polar blends) exposed to THF and n-hexane, the selected TPU showed a slightly better affinity to THF than PCL resins. However, both resins exhibited fewer affinities to n-hexane. Interestingly, the bent TPU sample expanded first, instead of shrinking, on exposing THF vapor. Unfortunately, the reversible behavior was not perceived after exposure to the air. However, with the addition of PCL, most TPU/PCL blends remarkably demonstrated the reversible shrinking/expanding behavior on exposure to the THF/air environment. This observation can't be explained by the simple gradient swelling/crystallization mechanism described in the literature. In overviewing our previous blends with different combinations in polarity on exposing the selective vapors, we propose a competing swelling/internal stress mechanism, that the dominant forces between solvent expansion/shrinkage through the (gradient) swelling effect and solvent-induced contraction/drying-induced elongation through the internal stress effect in the typical two-way shape memory behavior played an important role. To the best of our knowledge, this is the first study to comprehensively outline the possible competing factors to justify this interesting contrast in their solvent vapor-triggered reversible shape memory behavior for those blends. This simple blending method reveals numerous potentials to prepare multi-triggered two-way shape memory polymer blends.
  • Editor: Springer
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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