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

Kim, So Young; Lee, Tae Hee; Park, Yong Il; Nam, Joon Hyun; Noh, Seung Man; Cheong, In Woo

doi:10.1016/j.polymer.2017.09.021

Cited by 32 publications

(25 citation statements)

References 55 publications

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“…Local thermal analysis allows the determination of thermomechanical behaviour at the microscopic scale, whereas nano-indentation is used to create well-controlled microscopic damage. Similarly, other studies have reported the advantage of a localized evaluation of the healing performance [21,22] and corrosion protection [23,24] of coatings. In this work, polymer networks that are reversibly crosslinked by the Diels-Alder cycloaddition reaction are considered.…”

Section: Introductionmentioning

confidence: 89%

Coupling the Microscopic Healing Behaviour of Coatings to the Thermoreversible Diels-Alder Network Formation

et al. 2018

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While thermally reversible polymer network coatings based on the Diels-Alder reaction are widely studied, the mechanisms responsible for the heating-mediated healing of damage is still not well understood. The combination of microscopic evaluation techniques and fundamental insights for the thermoreversible network formation in the bulk and coating shed light on the mechanisms behind the damage healing events. The thermomechanical properties of thermoset and elastomer coatings, crosslinked by the furan-maleimide Diels-Alder cycloaddition reaction, were studied in bulk and compared to the thermal behaviour applied as coatings onto aluminium substrates. The damage sealing of thermoset (Tg = 79 °C) and elastomer (Tg = −49 °C) coatings were studied using nano-lithography and atomic force microscopy (AFM). The sealing event is studied and modelled at multiple temperatures and correlated to the changes in the network structure and corresponding thermomechanical properties.

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Section: Introductionmentioning

confidence: 89%

Coupling the Microscopic Healing Behaviour of Coatings to the Thermoreversible Diels-Alder Network Formation

et al. 2018

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“…hydroxyl or amine, as a termination for polyurethane prepolymers. [8][9][10][11][12] However, the low loading capability of the functionalities and the decreased molecular weight of the polyurethanes are two main disadvantages for the chain termination methods. Alternatively, functional groups can be directly introduced into polyurethane hard-segment by using chain extenders with pendant desirable functionalities as a functional building block.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polyurethanes with pendant azide groups attached on the soft segments and the surface modification with mPEG by click chemistry for antifouling applications

et al. 2018

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“…Temperature for thermal treatment was chosen in accordance with the peak of r‐DA endotherm, while avoiding thermal degradation of the material (i.e., the maximum temperature for the healing cycle was maintained ≈50 °C lower than the onset of thermal degradation as assessed by TGA in air, see Figure S1, Supporting Information). Notably, the time required for the healing treatment in this work was slightly shorter (90 min) compared to the majority of furan polyacrylates/maleimide networks previously reported in the literature (typically > 2h) …”

Section: Thermal Properties Of Copolymers After Crosslinking With C6 mentioning

confidence: 81%

“…In this context, dynamic covalent chemistries have emerged as an efficient tool to embed reversible linkages into acrylate networks, in order to provide healing ability under a suitable external stimulus. While recent efforts have been addressed to the development of approaches based on disulfide bond exchange, alkoxyamine dissociation, thiol‐Michael reaction, Alder‐ene addition, and bulky urea bonds, the most widely reported systems are based on the well‐established Diels–Alder (DA) cycloaddition …”

Section: Thermal Properties Of Copolymers After Crosslinking With C6 mentioning

confidence: 99%

Highly Transparent and Colorless Self‐Healing Polyacrylate Coatings Based on Diels–Alder Chemistry

Fortunato

Tatsi

Rigatelli

et al. 2020

Macro Materials & Eng

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the development of approaches based on disulfide bond exchange, [3] alkoxyamine dissociation, [4] thiol-Michael reaction, [5] Alder-ene addition, [6] and bulky urea bonds, [7] the most widely reported systems are based on the well-established Diels-Alder (DA) cycloaddition. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] DA is a click-type addition reaction between a dienophile and a diene, typically a maleimide and a furan. The design of a polymer network where crosslinks are constituted by DA adducts would result in the ability to cleave the crosslinks at mildto-high temperature through a retro Diels-Alder process (r-DA), while enabling their reformation upon cooling through the direct DA reaction. Therefore, the r-DA/ DA sequence can be exploited to repair cracks or to remold the crosslinked material. [24] The concept, firstly described in a patent [25] and then in the milestone work of Wudl [26] has been exploited for the dynamic crosslinking of different polymer matrices like epoxies, [27,28] elastomers, [29,30] polyesters, [31,32] and polyketones. [33,34] A straightforward strategy to design DA crosslinked acrylates is based on the combination of linear copolymers of furfuryl methacrylates (FMAs) with difunctional maleimide linkers. [8][9][10]12,16,20] The reported systems are typically characterized by high healing efficiency. However, they lack in transparency and usually exhibit a yellow-to-orange color, predominantly due to the use of aromatic bismaleimide linkers. This feature factually forbids the utilization of DA-based acrylates for optical applications, where high levels of transmittance in the visible wavelength range are inevitably required.To bridge this gap, a straightforward strategy to prepare colorless and transparent thermoresponsive acrylates based on the DA chemistry is proposed in this work. Furan functional polyacrylates were synthetized via free radical polymerization of FMA with methacrylates bearing different aliphatic groups. Two aliphatic bismaleimides, with different chain length, were synthesized starting from the respective diamines. The obtained linear copolymers containing furan moieties were combined with the bismaleimides in solvent, and colorless, high-transmittance, crosslinked coatings were obtained. The thermal reversibility of the DA-coatings was assessed by means of differential scanning calorimetry (DSC) and solubility experiments. After assessing the self-healing ability of the acrylicbased polymeric materials, the effect of network structure (i.e.,

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

Cited by 32 publications

References 55 publications

Coupling the Microscopic Healing Behaviour of Coatings to the Thermoreversible Diels-Alder Network Formation

Coupling the Microscopic Healing Behaviour of Coatings to the Thermoreversible Diels-Alder Network Formation

Synthesis of polyurethanes with pendant azide groups attached on the soft segments and the surface modification with mPEG by click chemistry for antifouling applications

Highly Transparent and Colorless Self‐Healing Polyacrylate Coatings Based on Diels–Alder Chemistry

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