Castor oil-based polyurethane networks containing diselenide bonds: Self-healing, shape memory, and high flexibility

• Published in: Progress in organic coatings 2022-02, Vol.163, p.106615, Article 106615
• Main Authors: Liu, Ruitong, Li, Shouhai, Yao, Na, Xia, Jianling, Li, Mei, Ding, Haiyang, Xu, Lina, Yang, Xiaohua
• Format: Article
• Language: English
• Subjects: Biopolymers; Bonding; Castor oil; Covalent bonds; Dynamic covalent bond; Elongation; Functional polyurethane network coatings; Mechanical properties; Metathesis; Networks; Polymer coatings; Polyurethane resins; Recyclability; Renewable resources; Segments; Self-healing; Shape memory; Tensile strength
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2021.106615

Multifunctional coating materials from bio-renewable resources have attracted significant attention in recent years. In this study, a series of multifunctional castor oil-based polyurethane (PU) networks with different hard segments containing diselenide bonds are prepared. The characteristics of PU networks such as self-healing, shape memory, mechanical behavior, and recyclable properties are investigated. All PU networks containing diselenide bonds exhibited self-healing properties under heating due to the metathesis of diselenide. PU network with a hard segment of asymmetric alicyclic structure heals entirely within 2 h under a moderate temperature (70 °C). The shape fixation and recovery ratio are kept above 99.3% and 60.6% after three cycles, respectively. Furthermore, the PU network exhibited high tensile strength (6.9 MPa), superior elongation at break up to 468%, and excellent recyclability. This work would be helpful to the development of research on functional bio-based polymer coatings containing materials dynamic covalent bonds of diselenide. [Display omitted] •A series of multifunctional castor oil-based polyurethane (PU) networks containing diselenide bonds were designed.•All PU networks containing diselenide bonds exhibited self-healing properties due to the metathesis of diselenide.•The prepared IP–SeSe films exhibited excellent self-healing efficiency while retaining high flexibility.•The shape fixation and recovery ratio of IP–SeSe films were kept above 99.3% and 60.6% after three cycles, respectively.