Scratch properties of clear coat for automotive coating comprising molecular necklace crosslinkers with silane functional groups for various environmental factors

Sung Wook Moon, Jiae Seo, Ji Hun Seo, Byoung Ho Choi

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Automotive coatings, which comprise multiple layers, i.e., primer, base coating, and clear coat layers, are exposed to various environmental conditions that pose various types of damages to them. In particular, the outer layer of the automotive coating, i.e., the clear coat, is affected significantly by such damages. Therefore, a reliable and durable clear coat must be developed to improve the appearance of automobiles. In this study, a new clear coat based on an acrylic-based clear coat modified using polyrotaxane crosslinkers, which are necklace-shaped supramolecules composed of ring-shaped host molecules, is developed and characterized. The effects of polyrotaxane and silane on the scratch properties and mechanisms of the clear coating are analyzed. It is observed that the critical loads of the clear coat from scratch tests can be improved by adding optimal molecular necklace crosslinkers comprising silane functional groups. The improvement in the scratch properties of the modified acrylic-based clear coat may be attributed to the crosslinking characteristics and dynamic molecular movements of the polyrotaxane. In addition, the effects of environmental factors on the scratch characteristics of the modified acrylic-based clear coat are investigated by addressing the scratch durability of the clear coat.

    Original languageEnglish
    Article number3933
    JournalPolymers
    Volume13
    Issue number22
    DOIs
    Publication statusPublished - 2021 Nov 1

    Bibliographical note

    Funding Information:
    Funding: This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021R1A2C2012958).

    Publisher Copyright:
    © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

    Keywords

    • Automotive coat
    • High temperature
    • Polyrotaxane
    • Scratch
    • Silane functional group
    • Ultraviolet

    ASJC Scopus subject areas

    • General Chemistry
    • Polymers and Plastics

    Fingerprint

    Dive into the research topics of 'Scratch properties of clear coat for automotive coating comprising molecular necklace crosslinkers with silane functional groups for various environmental factors'. Together they form a unique fingerprint.

    Cite this