Effects of chitosan fiber addition on the properties of polyurethane with thermo-responsive shape memory

Kyotaro Kawaguchi, Masahiro Iijima, Hiroshi Miyakawa, Mitsuru Ohta, Takeshi Muguruma, Kazuhiko Endo, Futoshi Nakazawa, Itaru Mizoguchi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We investigated the effects of the addition of chitosan fiber (biomass nanofiber made by Sugino (BiNFi-s)) to polyether-based thermoplastic polyurethane (TPU) on material properties. BiNFi-s (2 and 5 wt %)/TPU composite materials were prepared via compression molding, and glass fiber (2 and 5 wt %)/TPU composite materials and plain TPU were also prepared for comparison. The glass transition temperature was analyzed using differential scanning calorimetry, and the crystal structure was investigated using X-ray diffraction. 20-mm-long test specimens with cross-sectional dimensions of 1 mm × 1 mm were cut from sheets of the composite materials, and three-point bending tests were carried out using a universal testing machine to investigate their mechanical properties and shape memory. The addition of BiNFi-s or glass fiber to TPU did not influence the glass transition temperature, although the crystal structure changed from semi-crystalline to amorphous. The elastic modulus increased 40% by the addition of 5 wt % BiNFi-s (2.31 MPa) compared with plain TPU (1.65 MPa), and these composites exhibited shape recovery with clinically relevant changes in temperature. The addition of 5 wt % BiNFi-s into TPU resulted in an improvement in the elastic modulus without any decrease in the shape memory effect.

Original languageEnglish
Pages (from-to)1151-1156
Number of pages6
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Issue number5
Publication statusPublished - 2017 Jul
Externally publishedYes


  • chitosan
  • mechanical properties
  • polymer
  • shape memory
  • thermoplastic polyurethane

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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