Polycarbonate/Titania Hybrid Films with Localized Photo-Induced Magnetic-Phase Transition

Nanomaterials

Sei Kurebayashi¹  Takeshi Toyama¹  Hiroki Ikake¹  Takehiro Kaneko¹  Shigeru Shimizu¹  Shuta Hara¹  Shota Watanabe¹  Genza Sanae¹ 

[1] Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, 1-8-14 Kandasurugadai, Chiyoda-ku, Tokyo 101-8308, Japan;

关键词: networks;    nanocomposites;    polycarbonates;    magnetic polymers;    oligomers;    Small Angle X-ray Scattering (SAXS);   

DOI  :  10.3390/nano11010005

来源: DOAJ

【 摘 要 】

Materials that exhibit the photo-induced magnetic-phase transition of titania are receiving significant attention because they can be easily switched between diamagnetism and paramagnetism by UV irradiation. However, it is difficult to store photo-induced titanium (Ti³⁺) in air because of its easy oxidation upon oxygen exposure. In this study, titania/polycarbonate hybrid films were prepared using linear 1,6-hexanediol (PHMCD), cyclic 1,4-cyclohexanedimethanol (PCHCD), or their copolymerized carbonate oligomers using the sol–gel method. The oxygen permeability of the hybrid film decreased as the ratio of the ring structure increased by a factor of approximately 32 from PHMCD with only the chain structure to PCHCD with only the ring structure. These hybrid films can generate Ti³⁺ under a UV irradiation of 250 W for 2 h, and the difference in oxygen permeability significantly affected the lifetime of the Ti³⁺ by a factor of up to 120. In addition, the tensile tests and IR measurements demonstrated that UV irradiation had little effect on the mechanical intensity and matrix chemical structure. Moreover, the magnetic susceptibility of Ti³⁺ present in PCHCD was confirmed to be 6.2 (10⁻³ emu/g(titania)) under an external magnetic field of 5 T induced using a superconducting quantum interference device.

【 授权许可】

Unknown