Abstract
A self-healing waterborne polyurethane (WPU) materials containing dynamic disulfide (SS) bond was prepared by introducing SS bond into polymer materials. The zeta potential revealed that all the synthesized WPU emulsions displayed excellent stability, and the particle size of them was about 100 nm. The characteristic peaks of N-H and S-S in urethane were verified by FTIR, and the chemical environment of all elements were confirmed by the XPS test. Furthermore, the tensile strength, self-healing process and self-healing efficiency of the materials were quantitatively evaluated by tensile measurements. The results showed that the self-healing efficiency could reach 96.14% when the sample was heat treated at 70 °C for 4 h. In addition, the material also showed a good reprocessing performance, and the tensile strength of the reprocessed film was 3.39 MPa.
Highlights
To date, polymer materials have been widely used in various fields because of their excellent corrosion resistance and mechanical and barrier properties
The polydispersity index shows that the distribution of WPU2 dispersion is more uniformwhere than that of WPU1 dispersion
Into paper, polymer, functional self-healing waterborne polyurethane was synthesized ing into polymer, functional self-healing waterborne polyurethane was synthesized with PTMG as soft segment, IPDI as hard segment and Dimthylolpropionic acid (DMPA) containing hydrophilic with as soft The segment, IPDI as hard segment andthe zeta potential revealed that all synthesized
Summary
Polymer materials have been widely used in various fields because of their excellent corrosion resistance and mechanical and barrier properties. It is accessible to produce micro-slaps on the surface and inside of the traditional polymer materials due to the influence of mechanical, light and chemical substances in the manufactural processing and practical applications. These cracks are difficult to detect with the naked eye and may cause further damage to the materials, reducing the mechanical properties and safety of the materials and shortening their service time. From the perspective of bionics, self-healing materials can be divided into extrinsic and intrinsic types according to whether they contain additional repair reagents or not. It is not necessary to add additional repair reagents in advance [7,8]
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