Abstract
A flexible hard coating material displaying extreme scratch resistance and foldable flexibility was developed via the design of an organic-inorganic hybrid coating material employing an alkoxysilyl-functionalized polyrotaxane cross-linker (PRX-Si1). PRX-Si1 has a molecular necklace-like structure that can form organic-inorganic cross-linking points and provide large molecular movements. It was postulated that the scratch resistance and flexibility could be simultaneously increased because of the hybrid cross-linking points and dynamic molecular movements. To confirm this hypothesis, the crystalline structure and mechanical properties of the PRX-Si1-based hard coating material were analyzed via transmission electron microscopy, small-angle X-ray diffraction, tensile, pencil hardness, and scratch tests. Finally, the PRX-Si1-based hard coating material could form homogeneously dispersed nanoscale siloxane crystalline domains, and the strain at the break point was 3 times higher than that of a commercial hard coating material, resulting in no defect formation even after 5000 folding test runs. Moreover, the material displayed extremely high pencil hardness (9H) and scratch resistance.
Original language | English |
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Pages (from-to) | 27306-27317 |
Number of pages | 12 |
Journal | ACS Applied Materials and Interfaces |
Volume | 11 |
Issue number | 30 |
DOIs | |
Publication status | Published - 2019 Jul 31 |
Bibliographical note
Funding Information:This research was partially supported by the KCC Research Institute and Korea University-Future Research Unit (K1822141). This research was also supported by the X-Project, funded by the National Research Foundation, Republic of Korea (NRF-2018R1E1A2A02086660).
Publisher Copyright:
© 2019 American Chemical Society.
Keywords
- antiscratch
- coating material
- cross-linker
- hybrid
- polyrotaxane
- siloxane
ASJC Scopus subject areas
- General Materials Science