Effect of covalent cross-links on the network structure of thermo-reversible ionic elastomers

Mora-Barrantes, I.; Malmierca, M. A.; Valentín, Juan López; Rodrı́guez, A.; Ibarra, L.

doi:10.1039/c2sm06975j

Cited by 47 publications

(62 citation statements)

References 51 publications

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“…Such a weak transition has also been observed in other ion-containing elastomers. 29,30 With increasing ATA content, the relaxation transition temperature and tan i max height increase which shows that the strength of the nanophase separated aggregates is increasing. The strengthening of these aggregates plays an important role in the self-healing property.…”

Section: Resultsmentioning

confidence: 98%

Preparation of supramolecular thermally repairable elastomer by crosslinking of maleated polyethylene‐octene elastomer with 3‐amino‐1,2,4‐triazole

Kashif

Chang

2014

Polymer International

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Section: Resultsmentioning

confidence: 98%

Preparation of supramolecular thermally repairable elastomer by crosslinking of maleated polyethylene‐octene elastomer with 3‐amino‐1,2,4‐triazole

Kashif

Chang

2014

Polymer International

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“…The underlying mechanisms resonate at different frequency regimes e while the thermal dissipation for many transition metals is most intense in the visible region, the radiofrequency (RF, kHz e MHz) fields employed for the activation of magnetic nanoparticles show a high penetration depth for many materials including biosystems and polymers. The absorption of RF waves and transformation into heat is mainly concentrated by certain antenna materials, including metals and superparamagnetic or ferromagnetic nanostructures, and therefore ensures a high selectivity and control of the heat evolution [36,37].…”

Section: Introductionmentioning

confidence: 99%

Remote-controlled activation of self-healing behavior in magneto-responsive ionomeric composites

Hohlbein

Shaaban

Schmidt

2015

Polymer

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“…[41][42][43][44][45][46][47][48] However, the co-existence of the two types of cross-links may give rise to conflicting properties, and it is still a challenge to integrate multiple functionalities such as self-healing and shape memory properties with good mechanical performance into a single component material. [41][42][43][44][45][46][47][48] However, the co-existence of the two types of cross-links may give rise to conflicting properties, and it is still a challenge to integrate multiple functionalities such as self-healing and shape memory properties with good mechanical performance into a single component material.…”

Section: Introductionmentioning

confidence: 99%

Intelligent rubber with tailored properties for self-healing and shape memory

et al. 2015

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A strategy of combining covalent and non-covalent cross-links to construct multifunctional rubber materials with intelligent self-healing and shape memory ability is demonstrated. The rubbers were prepared by self-assembly of complementary polybutadiene oligomers bearing carboxylic acid and amine groups through reversible ionic hydrogen bonds via acid-base reaction, and then further covalently cross-linking by tri-functional thiol via thiol-ene reaction. The resulting polymers exhibit self-healing and shape memory functions owing to the reversible ionic hydrogen bonds. The covalent cross-linking density can be tuned to achieve tailorable mechanical and stimuli-responsive properties: a low covalent cross-linking density remains the rubber remarkable self-healing capability at ambient temperature without any external stimulus, while a high covalent cross-linking density improves the mechanical strength and induces shape memory behavior, but effective self-healing needs to be triggered at high temperature. This strategy might open a promising pathway to fabricate intelligent multifunctional polymers with versatile functions. 9 and 9.2 mol%, respectively. Fig. 2b shows the typical FTIR spectra of pristine PB, PB-NH 2 , PB-COOH, and PB-COOH/NH 2 . For PB-NH 2 and PB-COOH, the presence of absorbance at 3382 cm -1 corresponding to -NH 2 stretching vibration and 1714cm -1 corresponding to C=O stretching vibration indicates the incorporation of amine and carboxylic acid groups into the PB backbone, respectively. For the prepared supramolecular polymer PB-COOH/NH 2 , the peak at 1714 cm -1 for neutral COOH almost completely disappears, and a new peak at 1570 cm -1 emerges, which can be attributed to carboxylate anions arising from proton transfer reaction (acid-base reaction) between carboxylic acid groups on PB-COOH and amine groups on PB-NH 2 , thus confirming the formation of ionic hydrogen bonds in the supramolecular polymers. Fig. 2 (a) 1 H NMR spectra of PB, PB-NH 2 and PB-COOH in CDCl 3 , (b) FTIR spectra of PB, PB-NH 2 , PB-COOH and supramolecular polymer PB-COOH/NH 2 .11 observed with the increase of the frequency. At low frequencies, the supramolecular interactions are able to break and re-form at the time scale probed, which is longer than the lifetime of the dynamic bonds, thus leading to a viscoelastic liquid behavior. At higher frequencies, however, the experimental time is not long enough for the supramolecular interactions to dissociate, thus the polymers exhibit elastic-like behavior. Furthermore, the crossover frequency (ω cross ) between G′ and G″ (tan δ=1) shifts to lower frequencies with the increase in covalent cross-linking density for all three samples. The lifetime of the reversible supramolecular networks can be measured as the inverse of the crossover frequency (ω cross ) of G′ and G″ (τ=1/ω). 64 Thus, the supramolecular networks with higher covalent cross-linking density possess longer life time arising from the decrease of the polymer chain mobility, which is consistent with the DSC results. Fi...

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Effect of covalent cross-links on the network structure of thermo-reversible ionic elastomers

Cited by 47 publications

References 51 publications

Preparation of supramolecular thermally repairable elastomer by crosslinking of maleated polyethylene‐octene elastomer with 3‐amino‐1,2,4‐triazole

Preparation of supramolecular thermally repairable elastomer by crosslinking of maleated polyethylene‐octene elastomer with 3‐amino‐1,2,4‐triazole

Remote-controlled activation of self-healing behavior in magneto-responsive ionomeric composites

Intelligent rubber with tailored properties for self-healing and shape memory

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