Reversible polymer networks based on the dynamic hindered urea bond for scratch healing in automotive clearcoats

Gi Young Kim; Sujin Sung; Minsoo P. Kim; Soon Cheon Kim; Sang Ho Lee; Young Il Park; Seung Man Noh; In Woo Cheong; Jin Chul Kim

doi:10.1016/j.apsusc.2019.144546

Reversible polymer networks based on the dynamic hindered urea bond for scratch healing in automotive clearcoats

Gi Young Kim, Sujin Sung, Minsoo P. Kim, Soon Cheon Kim, Sang Ho Lee, Young Il Park, Seung Man Noh, In Woo Cheong, Jin Chul Kim

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

A series of dynamic polyacrylate urethane urea networks containing hindered urea (HU) groups (C-HU-ethylene glycol, C-HU-EG; C-HU-tetra(ethylene glycol), C-HU-TEG; C-HU-poly(ethylene glycol), C-HU-PEG) were successfully synthesized for use in automotive clearcoats. The material properties of the clearcoats were controlled using different HU adducts and by adjusting their contents in the polymer networks. The indentation hardness (H_IT), modulus (E_IT), thermal stability (T_d), and glass-transition temperature (T_g) of the polymer networks were characterized by nano-indentation tests, thermogravimetric analysis, dynamic mechanical analysis, and differential scanning calorimetry, respectively. The scratch-resistance and healing performances of the polymer networks were evaluated quantitatively using a micro-scratch tester in conjunction with optical microscopy. The results reveal that the C-HU-TEG polymer networks not only exhibited physical properties most similar to those of the commercial clearcoat (T30) but also demonstrated the best self-healing performance. The balanced chemical structure of the HU-TEG adduct between the flexible unit (TEG) and the rigid unit (IPDI, urea, and urethane bond) played an important role of increasing scratch-healing performance while maintaining the clearcoat material properties.

Original language	English
Article number	144546
Journal	Applied Surface Science
Volume	505
DOIs	https://doi.org/10.1016/j.apsusc.2019.144546
State	Published - 1 Mar 2020

Keywords

Automotive clearcoat
Dynamic hindered urea bond
Dynamic polymer network
Intrinsic self-healing
Scratch healing
Scratch resistance

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10.1016/j.apsusc.2019.144546

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title = "Reversible polymer networks based on the dynamic hindered urea bond for scratch healing in automotive clearcoats",

abstract = "A series of dynamic polyacrylate urethane urea networks containing hindered urea (HU) groups (C-HU-ethylene glycol, C-HU-EG; C-HU-tetra(ethylene glycol), C-HU-TEG; C-HU-poly(ethylene glycol), C-HU-PEG) were successfully synthesized for use in automotive clearcoats. The material properties of the clearcoats were controlled using different HU adducts and by adjusting their contents in the polymer networks. The indentation hardness (HIT), modulus (EIT), thermal stability (Td), and glass-transition temperature (Tg) of the polymer networks were characterized by nano-indentation tests, thermogravimetric analysis, dynamic mechanical analysis, and differential scanning calorimetry, respectively. The scratch-resistance and healing performances of the polymer networks were evaluated quantitatively using a micro-scratch tester in conjunction with optical microscopy. The results reveal that the C-HU-TEG polymer networks not only exhibited physical properties most similar to those of the commercial clearcoat (T30) but also demonstrated the best self-healing performance. The balanced chemical structure of the HU-TEG adduct between the flexible unit (TEG) and the rigid unit (IPDI, urea, and urethane bond) played an important role of increasing scratch-healing performance while maintaining the clearcoat material properties.",

keywords = "Automotive clearcoat, Dynamic hindered urea bond, Dynamic polymer network, Intrinsic self-healing, Scratch healing, Scratch resistance",

author = "Kim, {Gi Young} and Sujin Sung and Kim, {Minsoo P.} and Kim, {Soon Cheon} and Lee, {Sang Ho} and Park, {Young Il} and Noh, {Seung Man} and Cheong, {In Woo} and Kim, {Jin Chul}",

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doi = "10.1016/j.apsusc.2019.144546",

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AU - Kim, Gi Young

AU - Sung, Sujin

AU - Kim, Minsoo P.

AU - Kim, Soon Cheon

AU - Lee, Sang Ho

AU - Park, Young Il

AU - Noh, Seung Man

AU - Cheong, In Woo

AU - Kim, Jin Chul

PY - 2020/3/1

Y1 - 2020/3/1

N2 - A series of dynamic polyacrylate urethane urea networks containing hindered urea (HU) groups (C-HU-ethylene glycol, C-HU-EG; C-HU-tetra(ethylene glycol), C-HU-TEG; C-HU-poly(ethylene glycol), C-HU-PEG) were successfully synthesized for use in automotive clearcoats. The material properties of the clearcoats were controlled using different HU adducts and by adjusting their contents in the polymer networks. The indentation hardness (HIT), modulus (EIT), thermal stability (Td), and glass-transition temperature (Tg) of the polymer networks were characterized by nano-indentation tests, thermogravimetric analysis, dynamic mechanical analysis, and differential scanning calorimetry, respectively. The scratch-resistance and healing performances of the polymer networks were evaluated quantitatively using a micro-scratch tester in conjunction with optical microscopy. The results reveal that the C-HU-TEG polymer networks not only exhibited physical properties most similar to those of the commercial clearcoat (T30) but also demonstrated the best self-healing performance. The balanced chemical structure of the HU-TEG adduct between the flexible unit (TEG) and the rigid unit (IPDI, urea, and urethane bond) played an important role of increasing scratch-healing performance while maintaining the clearcoat material properties.

AB - A series of dynamic polyacrylate urethane urea networks containing hindered urea (HU) groups (C-HU-ethylene glycol, C-HU-EG; C-HU-tetra(ethylene glycol), C-HU-TEG; C-HU-poly(ethylene glycol), C-HU-PEG) were successfully synthesized for use in automotive clearcoats. The material properties of the clearcoats were controlled using different HU adducts and by adjusting their contents in the polymer networks. The indentation hardness (HIT), modulus (EIT), thermal stability (Td), and glass-transition temperature (Tg) of the polymer networks were characterized by nano-indentation tests, thermogravimetric analysis, dynamic mechanical analysis, and differential scanning calorimetry, respectively. The scratch-resistance and healing performances of the polymer networks were evaluated quantitatively using a micro-scratch tester in conjunction with optical microscopy. The results reveal that the C-HU-TEG polymer networks not only exhibited physical properties most similar to those of the commercial clearcoat (T30) but also demonstrated the best self-healing performance. The balanced chemical structure of the HU-TEG adduct between the flexible unit (TEG) and the rigid unit (IPDI, urea, and urethane bond) played an important role of increasing scratch-healing performance while maintaining the clearcoat material properties.

KW - Automotive clearcoat

KW - Dynamic hindered urea bond

KW - Dynamic polymer network

KW - Intrinsic self-healing

KW - Scratch healing

KW - Scratch resistance

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JO - Applied Surface Science

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Reversible polymer networks based on the dynamic hindered urea bond for scratch healing in automotive clearcoats

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