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Influence of material properties on scratch-healing performance of polyacrylate-graft-polyurethane network that undergo thermally reversible crosslinking

Author(s)
Kim, So YoungLee, Tae HeePark, Young IlNam, Joon HyunNoh, Seung ManCheong, In WooKim, Jin Chul
Issued Date
2017-10
DOI
10.1016/j.polymer.2017.09.021
URI
https://scholarworks.unist.ac.kr/handle/201301/22772
Fulltext
http://www.sciencedirect.com/science/article/pii/S0032386117308832?via%3Dihub
Citation
POLYMER, v.128, pp.135 - 146
Abstract
Scratch-healing poly (methyl methacrylate)-co-[poly (methyl metharyleate)-graft-(oligo-caprolactone)] urethane networks containing a Diels Alder (DA) adduct unit (GCPNp-DAs) were successfully synthesized and shown to be capable of undergoing thermally reversible crosslinking. The synthesized polymers were coated on steel substrates to investigate the influence of their material properties on their scratch-healing performance. The reversible formation of crosslinked and de-crosslinked structures of the GCPNp-DAs at DA and retro-DA (rDA) reaction temperatures was demonstrated using FT-IR spectroscopy, differential scanning calorimetry (DSC), oscillatory rheology, and nanoindentation. The scratch-resistance and healing performances of the GCPNp-DA coatings were evaluated quantitatively using a scratch test machine equipped with an optical microscope (OM) and an atomic force microscope (AFM). These results were found to be greatly influenced by the material properties of the coatings such as the elastic modulus, indentation hardness (HIT), crosslinking density (vc), and thermal transition temperature as well as by whether the deforming load that produced the scratches was increased in a progressive (gradual) or step-wise manner.
Publisher
ELSEVIER SCI LTD
ISSN
0032-3861
Keyword (Author)
Diels alder reactionGraft copolymerIntrinsic self-healingReversible crosslinkingScratch resistanceScratch-healing
Keyword
DIELS-ALDER REACTIONHINDERED UREA BONDSACRYLIC LATEXTHIOL-ENEPOLYMERTEMPERATURECOATINGSCOMPOSITESCHEMISTRYMOIETIES

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