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Effects of chitosan fiber addition on the properties of polyurethane with thermo‐responsive shape memory
Author(s) -
Kawaguchi Kyotaro,
Iijima Masahiro,
Miyakawa Hiroshi,
Ohta Mitsuru,
Muguruma Takeshi,
Endo Kazuhiko,
Nakazawa Futoshi,
Mizoguchi Itaru
Publication year - 2017
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33664
Subject(s) - materials science , thermoplastic polyurethane , composite material , differential scanning calorimetry , glass transition , composite number , fiber , dynamic mechanical analysis , glass fiber , amorphous solid , compression molding , polyurethane , elastomer , polymer , crystallography , mold , chemistry , physics , thermodynamics
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. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1151–1156, 2017.