Lanzhou Institute of Chemical Physics, Cas

Lanzhou Institute of Chemical Physics

Zenghui Yang

Xiaoyue Wang

Yaoming Zhang

Tingmei Wang

Xinrui Zhang

Qihua Wang

Jing Xu

Provided are a self-healing polyurethane (PU) material, a double-layer self-healing PU film, and a preparation method and use thereof. In the disclosure, the self-healing PU material includes a PU material I and a PU material II that are packaged separately. A soft-layer PU film prepared based on the PU material I and a hard-layer PU film prepared based on the PU material II could be combined to form a double-layer PU film.

Self-healing polyurethane (PU) material, double-layer self-healing PU film, and preparation method and use thereof

The present disclosure belongs to the technical field of polymer materials, and in particular relates to a chain extender and a preparation method and application thereof, a recyclable thermosetting polyurethane and a preparation method thereof. The present disclosure provides a chain extender whose chemical formula is shown in formula I. The chain extender provided by the present disclosure contains two types of dynamic covalent bonds, and the total number of dynamic covalent bonds is 4. The thermosetting polyurethane prepared by the provided chain extender has better hot-pressing repair efficiency. The results of the examples show that under the same hot-pressing conditions, the repair efficiency of the thermosetting polyurethane prepared by the 4,4'-dithiodianiline chain extender is 59%. The repair efficiency of thermosetting polyurethane is 97%, which is significantly improved.

Chain extender, preparation method and application thereof, recyclable thermosetting polyurethane and preparation method thereof

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Lanzhou, China

Zenghui Yang