TY - JOUR
T1 - Preparation of Mechanically Anisotropic Polysaccharide Composite Films Using Roll-Press Techniques
AU - Sagawa, Takuya
AU - Nikaido, Yuichi
AU - Iijima, Kazutoshi
AU - Sakaguchi, Masahiro
AU - Yataka, Yusuke
AU - Hashizume, Mineo
N1 - Funding Information:
The authors thank Tomonori Shibata for the additional SEM observations of the hot-pressed films. The authors also thank Editage (www.editage.com) for English language editing.
Funding Information:
JSPS KAKENHI Grant Numbers JP25410178 and JP16K05799.
Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.
PY - 2023/2/14
Y1 - 2023/2/14
N2 - Natural polysaccharides are biocompatible and biodegradable; therefore, they can be used as feedstock for biodegradable structural materials and biomaterials. In this study, anisotropic polysaccharide composite films consisting of chondroitin sulfate C (CS) and chitosan (CHI) were fabricated from their polyion complex (PIC) gels by roll-press techniques. The obtained films (CS/CHI films) were thin and transparent, similar to the composite films prepared by hot-press techniques. The roll-press conditions were optimized, and it was observed that the molecular weight of CHI did not significantly affect the formability of the films, whereas the roll temperature and rolling speed were important. The tensile tests of the roll-pressed films revealed that the mechanical strength of the films in the mechanical direction (MD) was approximately 5 times higher than that in the transverse direction (TD), indicating that the roll-press techniques imparted mechanical anisotropy to the films. Additionally, the films shrank in the MD and expanded in the TD after immersion in aqueous solutions, followed by drying. Such anisotropic shrinking and expanding properties indicate that these films can be used as shape-memory materials.
AB - Natural polysaccharides are biocompatible and biodegradable; therefore, they can be used as feedstock for biodegradable structural materials and biomaterials. In this study, anisotropic polysaccharide composite films consisting of chondroitin sulfate C (CS) and chitosan (CHI) were fabricated from their polyion complex (PIC) gels by roll-press techniques. The obtained films (CS/CHI films) were thin and transparent, similar to the composite films prepared by hot-press techniques. The roll-press conditions were optimized, and it was observed that the molecular weight of CHI did not significantly affect the formability of the films, whereas the roll temperature and rolling speed were important. The tensile tests of the roll-pressed films revealed that the mechanical strength of the films in the mechanical direction (MD) was approximately 5 times higher than that in the transverse direction (TD), indicating that the roll-press techniques imparted mechanical anisotropy to the films. Additionally, the films shrank in the MD and expanded in the TD after immersion in aqueous solutions, followed by drying. Such anisotropic shrinking and expanding properties indicate that these films can be used as shape-memory materials.
UR - http://www.scopus.com/inward/record.url?scp=85147219527&partnerID=8YFLogxK
U2 - 10.1021/acsomega.2c07077
DO - 10.1021/acsomega.2c07077
M3 - Article
AN - SCOPUS:85147219527
SN - 2470-1343
VL - 8
SP - 5607
EP - 5616
JO - ACS Omega
JF - ACS Omega
IS - 6
ER -