Effect of diisocyanate structure on steric restructuring of hindered urea bonds for self-healable coating

Yun, Su Min; Lee, Hyang Moo; Ahmed, Sana; Kim, Jin Chul; Cheong, In Woo

doi:10.1016/j.porgcoat.2022.106730

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…Unlike cLPH, in case of cLPtB, change in the G ′ value in the range of 25∼180 °C was much larger than change in the G ″ value in the same temperature range. This behavior well reflects the dissociation and recombination of the HUB network structure of cLPtB. , …”

Section: Resultsmentioning

confidence: 66%

“…This behavior well reflects the dissociation and recombination of the HUB network structure of cLPtB. 2,61 The self-healing latex in this work is a one-pot system consisting of all three reagents (latex resin, blocked isocyanurate, and catalyst) coexisting in water. Therefore, it can be problematic if large amounts of water are present at the temperature at which DtBPy is deblocked.…”

Section: Thermomechanical Properties Of Crosslinkedmentioning

confidence: 70%

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Design of Eco-Friendly Self-Healing Polymers Containing Hindered Urea-Based Dynamic Reversible Bonds

Ahmed

Bae

Jeong

et al. 2022

ACS Appl. Polym. Mater.

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This work describes an emulsion polymer with self-healing capability based on a dynamic covalent bonding mechanism. A latex prepolymer (LPtB) containing bulky amine units was synthesized via soap-free emulsion polymerization. Then, a one-pot crosslinkable self-healing emulsion polymer was prepared by adding a blocked isocyanurate and a catalyst into the latex prepolymer, and subsequently, a crosslinked self-healing polymer film (cLPtB) was prepared. Syntheses of self-healing polymers were confirmed by Fourier transform infrared, size exclusion chromatography, proton nuclear magnetic resonance, dynamic light scattering, and transmission electron microscopy analyses. A control latex prepolymer (LPH) was also synthesized without bulky amine functionality, and the self-healing properties of crosslinked LPH (cLPH) were compared to those of cLPtB under the same crosslinking and healing conditions. In addition, the effects of drying and crosslinking conditions at various temperatures on the film formation and crosslinking degree of polymer films were evaluated through atomic force microscopy and gel content analysis. cLPtB demonstrated a T g,DMA of 47 °C and onset dissociation of urea linkages at 120 °C, as confirmed by DMA. The cLPtB films exhibited complete restoration of mechanical properties after cutting and healing at a film formation temperature of 80 °C; they exhibited a self-healing efficiency (σSHE%) of 100%. The cLPtB coating surface also manifested a rapid healing process with 100% wound suturing at 100 °C for 5 min, as recorded by optical microscopy.

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Section: Resultsmentioning

confidence: 66%

Section: Thermomechanical Properties Of Crosslinkedmentioning

confidence: 70%

Design of Eco-Friendly Self-Healing Polymers Containing Hindered Urea-Based Dynamic Reversible Bonds

Ahmed

Bae

Jeong

et al. 2022

ACS Appl. Polym. Mater.

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“…Therefore, self-healing copolymers also exhibited the presence of Si–O–Si stretching and Si–O bending peaks. Moreover, the carbonyl peak from bulky urea appeared at 1650 cm –1 . , …”

Section: Resultsmentioning

confidence: 99%

“…As demonstrated in Figure S1c, the FTIR spectra for PtB prepolymer, PDMS, IPDI, and cross-linked self-healing Moreover, the carbonyl peak from bulky urea appeared at 1650 cm −1 . 38,39 DSC analyses were conducted to determine T g , as shown in Figure S1d. The PtB prepolymer exhibited a T g at 20 °C, while the other self-healing copolymers showed T g s ranging from 26 to 28 °C.…”

Section: Characterization Of Ptb Prepolymer and Self-healingmentioning

confidence: 99%

Microphase Separation Effects on Surface Scratch-Healing and Thermo-Mechanical Properties of Self-Healing Copolymers with Dynamic Covalent Bonds

Han,

Saddique,

Lyu

et al. 2024

ACS Appl. Polym. Mater.

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Achieving an equilibrium between the self-healing performance and thermo-mechanical properties of polymers is crucial, but exploration of the properties of self-healing polymers based on dynamic covalent bonding (DCB) in microphaseseparated polymer structures remains underinvestigated. This study examines the effects of microphase separation on the self-healing and thermo-mechanical properties of a poly(dimethylsiloxane), bis(3-aminopropyl) terminated, herein denoted as PDMS, crosslinked acrylic copolymer with hindered urea bonds (HUB). This combination leverages the benefits of both acrylic copolymers and PDMS. The phase separation of the self-healing copolymer was manipulated by using solvent blending and thermal annealing methods. Two PDMSs with different molecular lengths were used to study the effects on domain size and cross-linking density. It was confirmed that solvent blending curtails microphase separation, leading to crushed nanodomains of PDMS, while thermal annealing promotes clear microphase separation with distinct nanodomains. The observations from microphase morphology, stress− strain curves, moduli, and hardness indicate a significant correlation between self-healing performance, mechanical properties, and microphase-separated structure. The self-healing capabilities of this material were validated at nano (nanoscratch test via AFM), micro (single-scratch test using optical microscopy), and macro (crosscut-healing test using UTM) scales. These findings highlight the material's versatile nanostructures and mechanical properties, achieved through different processes, and its potential applicability in a wide range of fields.

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“…33 Similarly, Yun et al prepared a series of healable polymers by controlling the steric hindrance of isocyanate substituents. 34 Both results demonstrate the prepared materials containing dynamic urea bonds with larger steric hindrance show higher temperature sensitivity, leading to a higher rate of network rearrangement.…”

Section: Introductionmentioning

confidence: 83%

Enhancing the healability and degradability of epoxy via synergetic steric and electron-withdrawing effects for green electrical packaging

Zhang,

Sun,

Guo

et al. 2024

J. Mater. Chem. A

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Effect of diisocyanate structure on steric restructuring of hindered urea bonds for self-healable coating

Cited by 6 publications

References 29 publications

Design of Eco-Friendly Self-Healing Polymers Containing Hindered Urea-Based Dynamic Reversible Bonds

Design of Eco-Friendly Self-Healing Polymers Containing Hindered Urea-Based Dynamic Reversible Bonds

Microphase Separation Effects on Surface Scratch-Healing and Thermo-Mechanical Properties of Self-Healing Copolymers with Dynamic Covalent Bonds

Enhancing the healability and degradability of epoxy via synergetic steric and electron-withdrawing effects for green electrical packaging

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