Journal
ACS APPLIED POLYMER MATERIALS
Volume 4, Issue 5, Pages 3802-3810Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.1c01768
Keywords
intrinsic self-healing; dynamic hindered urea bond; dynamic polymer network; photo-thermal effect; NIR absorption; automotive clearcoat; scratch-healing coating
Funding
- KRICT [KS2241-20]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1C1C1005569]
- Technology Innovation Program - Ministry of Trade, Industry, and Energy (MOTIE, Korea) [20011133, 20017544]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20011133, 20017544] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020R1C1C1005569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, a self-healing automotive clearcoat based on a reversible polymer network and a photothermal dye was designed and demonstrated excellent self-healing performance and high transparency under sunlight irradiation.
Dynamic polymer networks containing photo-thermal materials have been reported to demonstrate highly efficient intrinsic self-healing under irradiation. In particular, organic near-infrared-absorbing ionic salts, such as diimmonium dyes, function as transparent polymer heaters and can enhance the self-healing properties of clearcoats. In this study, we designed a self-healing automotive clearcoat with a reversible polymer network based on acryl polyol (AP) and dynamic hindered urea (HU) bonds and introduced N-butyl-substituted diimmonium borate dye (DID) as a photothermal dye. To optimize the self-healing efficiency of the clearcoat and its transparency in the visible light region, the effects of the presence or absence of dynamic HU bonds and the concentration of the photothermal dye were precisely investigated. For a polymer system containing HU with 0.1 wt % DID (AP/HU-DID_0.1), the transparent automotive clearcoat was heated to similar to 70 degrees C under focused sunlight irradiation and exhibited excellent (similar to 100% healing efficiency) and fast (<30 s) scratch-healing performance compared with a commercial automotive clearcoat. In addition, this photothermal effect-based self-healing clearcoat exhibited outstanding transparency (over 95%) and has a strong advantage with respect to energy consumption because it enables faster and more localized healing compared with thermal healing processes that require heating the entire product.
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