Segmented polyurethanes containing movable rotaxane units on the main chain: Synthesis, structure, and mechanical properties

POLYMER

卷:193

Article

Sawada, Jun¹  Sogawa, Hiromitsu^1,3  Marubayashi, Hironori^2,4  Nojima, Shuichi²  Otsuka, Hideyuki²  Nakajima, Ken²  Akae, Yosuke¹  Takata, Toshikazu¹ 

[1] Tokyo Inst Technol, Dept Chem Sci & Engn, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Dept Chem Sci & Engn, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528552, Japan

[3] RIKEN, Ctr Sustainable Resource Sci, Biomacromol Res Team, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[4] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

关键词: Rotaxane;    Segmented polyurethane;    Thermoplastic elastomer;   

DOI  :  10.1016/j.polymer.2020.122358

来源: Elsevier

【 摘 要 】

In this study, segmented polyurethanes (SPUs), including those with rotaxane structures, were synthesized in high yields (>83%) using a [2]rotaxane diol that has a hydroxy group in each wheel and axle component. The traditional prepolymer method was applied to introduce rotaxane structures at different locations in the soft segment and at the boundary between soft and hard segments. The mechanical properties of the formed SPUs were evaluated via tensile tests, and we determined that the introduction of an appropriate amount of rotaxane structure improved their extensibility, toughness, and stress-relaxing properties. Differential scanning calorimetry (DSC), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR), and synchrotron Xray measurements revealed that the phase-separated structures of the SPUs were almost independent of the amount of rotaxane. The highly movable rotaxane scaffold was even effective for toughening the SPU, which is a physically cross-linked network, without changing their phase-separated structures.

【 授权许可】

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