Self-antiglare waterborne coating with superior mechanical robustness and highly efficient room-temperature self-healing capability

• Published in: Progress in organic coatings Vol. 146; p. 105717
• Main Authors: Huang, Huihua, Zhou, Wei, Zhong, Ziyuan, Peng, Shuangshuang, Peng, Xiaohong
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.2020; Elsevier BV
• Subjects: Aromatic disulfide metathesis; Arrays; Coatings; Gloss; H-bond array; Mechanical properties; Metathesis; Polymers; Robustness; Room temperature; Self healing materials; Self-antiglare; Self-healing; Substrates; Tensile strength; Waterborne polyurethane; H-bond array; Self-healing; Aromatic disulfide metathesis; Waterborne polyurethane; Self-antiglare
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2020.105717

Polymeric antiglare coatings are suitable for use on flexible substrates but are vulnerable to accidental scratches and cuts. Presently, polymers which can automatically heal the damages, has been successfully developed. However, the room-temperature self-healing polymers with excellent mechanical properties still is highly desirable and vast challenge. To solve these problems, aromatic disulfide containing two amino groups was introduced into waterborne poly(urea-urethane) (WPU), with unique H-bonds of zigzag array undergoing efficiency exchange at room temperature and inducing disulfide metathesis. Therefore, the tensile strength of the film could reach up to 11.0 MPa, and the mechanical property could be recovered to more than 83 % at room temperature after the sample was cut in half and reconnection. Meanwhile, the film displayed high transparency (91.4 %) and low gloss (27.2), showing excellent antiglare property when exposed to strong light. This finding can provide a novel insight into the research of robust room-temperature self-healing polymers and antiglare coatings. [Display omitted] •An environmentally friendly method to prepare self-antiglare and self-healing polymers.•The room-temperature self-healing polymers possess excellent mechanical properties.•A new strategy to construct the room-temperature self-healing polymers with robust mechanical properties.•The nano particles of room-temperature self-healing polymers endow the self-antiglare property. Polymeric antiglare coatings are suitable for use on flexible substrates but are vulnerable to accidental scratches and cuts. Presently, polymers which can automatically heal the damages, has been successfully developed. However, the room-temperature self-healing polymers with superior mechanical robustness are still formidable challenge to prepare and highly desirable. Reported herein is an self-antiglare waterborne poly(urea-urethane) (WPU) (the transparency and the 60° gloss are 91.4 % and 27.2, respectively) possessing the superior robust mechanical properties at room-temperature self-healing materials, with the tensile strength and toughness up to 11.0 MPa and 52.1 MJ m−3, respectively. For this purpose, aromatic disulfide containing two amino groups, which can offer a unique quadruple H-bond and a disulfide bond, were incorporated into the hard segment. Compared with linear-array H-bond, unique H-bond of zigzag array can undergo efficiency exchange at room temperature, inducing nearby disulfide metathesis. Therefore, the mechanical properties could be recovered to more than 83 % at room temperature after the sample was cut in half and reconnection. This finding can provide a novel insight into the research of robust room-temperature self-healing polymers and antiglare coatings.