Shock absorption of semi-interpenetrating network acrylic pressure-sensitive adhesive for mobile display impact resistance
| Autor: | Ji-Won Park, Hyun-Joong Kim, Seongju Lee, Joo-Young Jang, Dooyoung Baek, Jong-Ho Back |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering 030206 dentistry 02 engineering and technology Dynamic mechanical analysis Dissipation 021001 nanoscience & nanotechnology Biomaterials 03 medical and health sciences Shock absorber chemistry.chemical_compound 0302 clinical medicine Monomer chemistry Flexible display Damping factor Adhesive Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | International Journal of Adhesion and Adhesives. 99:102558 |
| ISSN: | 0143-7496 |
| Popis: | With the development of mobile display shapes from flat to flexible, the conventional glass cover window must be replaced by a film-type window. However, film-type cover windows have low impact resistance owing to their poor shock absorption. Therefore, to realize their application to flexible displays, it is essential to characterize and improve the shock-absorbing characteristics of the display film. In this study, a semi-interpenetrating network (semi-IPN) acrylic pressure-sensitive adhesive (PSA) consisting of a crosslinked network structure with a linear acrylic polymer chain was developed. The influence of the multi-functional monomer content and UV dose on the properties of the semi-IPN PSA was studied. The peel strength of the semi-IPN PSA was higher than 10 N/25 mm, which is generally considered as the PSA standard for mobile displays. With an increase in crosslink density, the storage modulus increased, but the damping factor decreased. To evaluate shock absorption, a falling ball impact tester was used to estimate the shock absorption ratio (ΔF) of the film. The semi-IPN PSA incorporating 30 phr of the multi-functional monomer exhibited higher ΔF (31.2%) than that of a conventional UV-curable PSA film (24.6%). This shows that even with the relatively low damping factor of the semi-IPN PSA, its structure could improve shock absorption. Moreover, we suggested two mechanisms for shock absorption of the semi-IPN PSA, energy dissipation into the PSA layer and extended contact time. |
| Databáze: | OpenAIRE |
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