title: Effects of chitosan fiber addition on the properties of polyurethane with thermo-responsive shape memory.
abstract: 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.
authors.affiliation: Division of Orthodontics and Dentofacial Orthopedics, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Kyotaro
authors.initials: K
authors.lastname: Kawaguchi
authors.affiliation: Division of Orthodontics and Dentofacial Orthopedics, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iijima
authors.affiliation: Division of Oral Microbiology, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Miyakawa
authors.affiliation: Analytical Applications Department, Kyoto Application Development Center, Shimadzu Corporation, Kyoto, Japan.
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Ohta
authors.affiliation: Division of Orthodontics and Dentofacial Orthopedics, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Muguruma
authors.affiliation: Division of Biomaterials and Bioengineering, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Endo
authors.affiliation: Division of Oral Microbiology, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Futoshi
authors.initials: F
authors.lastname: Nakazawa
authors.affiliation: Division of Orthodontics and Dentofacial Orthopedics, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
authors.forename: Itaru
authors.initials: I
authors.lastname: Mizoguchi
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D055119:Elastic Modulus; D006358:Hot Temperature; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D011140:Polyurethanes; D048271:Chitosan
keywords: chitosan; mechanical properties; polymer; shape memory; thermoplastic polyurethane