A solvent-free, transparent, self-healing polysiloxanes elastomer based on unsaturated carboxyl-amino ionic hydrogen bonds

Mo, Jiaheng; Chen, Xinyu; Fu, Yubing; Li, Rui; Lin, Yaling; Zhang, Anqiang

doi:10.1016/j.polymer.2021.123903

Cited by 16 publications

(7 citation statements)

References 42 publications

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“…As in α,β-unsaturated acids, unsaturated carboxylic acids behave exceptionally compared with regular carboxylic acids. In our previous work, the association constant of unsaturated carboxylic acid/amine and carboxylic acid/amine in dimethyl sulfoxide (DMSO) was determined to be 45.4 and 7.25 M –1 , respectively, revealing that the ionic strength between unsaturated carboxylic acid and amine groups is much stronger than that between saturated carboxylic acid and amine groups. The strengthening carboxylic acidity is mainly contributed by conjugated double bonds, which are beneficial for forming more stable acid/base interactions.…”

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confidence: 99%

Self-Healing, Self-Adhesive Strain Sensors Made with Carbon Nanotubes/Polysiloxanes Based on Unsaturated Carboxyl–Amine Ionic Interactions

Mai

Shan

et al. 2021

ACS Appl. Mater. Interfaces

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Strain sensors with high sensitivity, long-term durability, and stretchability are required for flexible and wearable electronic devices. This paper reports a bilayer strain sensor consisting of carboxyl-functionalized carbon nanotubes (CNTs) and ionically crosslinked polysiloxane substrates based on unsaturated acid–amine interactions. Vacuum filtration was adopted to prepare the CNT films (2.74–4.70 μm in thickness) onto the polysiloxane substrates to prepare stretchable conductive strain sensors. The strain sensor exhibited self-healing ability, self-adhesiveness, high sensitivity, linearity, low hysteresis, and long-term durability with a gauge factor of 33.99 at 55% strain. The sensitivity and linearity could be adjusted by the thickness of the CNT layer. A crack-related mechanism was proposed in which increasing the thickness of the CNT layer led to simultaneously enhanced sensitivity and linearity. Finally, we investigated the detection of human activities (bending/unbending of fingers or knees) and subtle motions (coughing and swallowing). The fabricated strain sensor succeeded in meeting various needs with satisfactory sensing performance.

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confidence: 99%

Self-Healing, Self-Adhesive Strain Sensors Made with Carbon Nanotubes/Polysiloxanes Based on Unsaturated Carboxyl–Amine Ionic Interactions

Mai

Shan

et al. 2021

ACS Appl. Mater. Interfaces

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“…The interaction energies of hydrogen bonding and pi-pi stacking are distributed between 25–40 and 1–50 kJ/mol, respectively, while that of ionic interactions is more than 100 kJ/mol [ 26 , 27 ]. The carboxyl groups of SA and the amino group of PEI are complementary ionic structures, resulting in a synergistic effect of hydrogen bonds and ionic interaction [ 28 ]. In terms of Coulomb’s law, electrostatic interaction energies depend on the dielectric constant of the charged particles and the distance between charged particles.…”

Section: Resultsmentioning

confidence: 99%

The Dispersion and Coagulation of Negatively Charged Ca2Nb3O10 Perovskite Nanosheets in Sodium Alginate Dispersion

Zhang

Miao

et al. 2022

Nanomaterials

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Chemically exfoliated nanosheets have been extensively employed as functional nanofillers for the fabrication of polymer nanocomposites due to their remarkable electrical, magnetic and optical properties. However, achieving a good dispersion of charged nanosheets in polymer matrix, which will determine the performance of polymer nanocomposites, remains a challenge. Herein, we investigated the dispersion and aggregation behavior of negatively charged Ca2Nb3O10 (CNO) perovskite nanosheets in negatively charged sodium alginate (SA) aqueous dispersion using dynamic light scattering (DLS). When CNO nanosheets meet with SA, aggregation and coagulation inevitably occurred owing to the absorption of SA on nanosheets. By controlling the electrostatic attraction between positively charged poly(ethylene imine) (PEI) and negatively charged SA, the charge density and hydrodynamic size of SA can be tuned to enable the good dispersion of CNO nanosheets in SA. This result may provide a new strategy to achieve the good dispersion of charged nanosheets in charged polymers for the rational design of multifunctional nanocomposites.

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“…The latter then act as robust physical crosslinks comparable to the chemical crosslinks in conventional elastomers or the glassy and/or semicrystalline domains in thermoplastic elastomers, leading to the so-called thermoplastic silicone elastomers or TPSEs. In this context, a variety of noncovalent interactions has been proposed, such as hydrogen bonding, ,− metal-ligand association, − π-stacking, − and ionic pairing. − Tuning the strength of the interaction through chemical design or through an external stimulus alters the connectivity of the physical network and can thus provide self-healing properties to silicone-based materials. This has in particular been shown with hydrogen bonding with numerous stickers of different strengths.…”

Section: Introductionmentioning

confidence: 99%

“…Not only such networks meet the constraints of materials self-repair mentioned above, but they also open new perspectives in terms of processability and ways to reuse/recycle the materials at its end of life. From a structural point of view, such materials can be prepared by considering various strategies such as the introduction of reversible covalent bonds, − physical interactions, − or a combination of the two. ,− …”

Section: Introductionmentioning

confidence: 99%

Extra-Soft Self-Healable Supramolecular Silicone Elastomers from Bis-Amide-PDMS Multiblock Copolymers Prepared by Aza-Michael Reaction

Fauvre

Fleury

Ganachaud

et al. 2023

ACS Appl. Polym. Mater.

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Silicone elastomers involving self-associating bis-amide groups were synthesized by aza-Michael addition between N,N′-methylenebis(acrylamide) and low molecular weight bis(3-aminopropyl)-terminated poly(dimethylsiloxane). In mild conditions that favor monoaddition (reaction of a primary amine) over diaddition (reaction of the resulting secondary amine), a library of non-crosslinked copolymers was prepared by tuning the vinyl-to-primary amine reactive function molar ratio. Almost no diadduct was observed for a reactive function molar ratio lower than 0.8, thus leading to linear polymers with predictable molecular weights. On the other hand, diaddition occurs at higher molar ratios such that polymers with some branches, high molecular weights, and large dispersity were synthesized. Regardless of the polymers considered, the amide groups develop some H-bond interactions as demonstrated by FTIR, leading to phase-separated domains, as revealed by DSC, which alters rheological and viscoelastic properties of the polymers. By increasing the molecular weight of the polymers, it was possible to turn the copolymers from viscoelastic liquids to viscoelastic solids and further to elastomers. Moreover, the latter material presents self-healing propensity at room temperature, which may be related to the diffusion of short chains, while the mechanical properties (strain and stress at break) are endowed by the long entangled linear-like chains, properties that are recovered after healing.

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A solvent-free, transparent, self-healing polysiloxanes elastomer based on unsaturated carboxyl-amino ionic hydrogen bonds

Cited by 16 publications

References 42 publications

Self-Healing, Self-Adhesive Strain Sensors Made with Carbon Nanotubes/Polysiloxanes Based on Unsaturated Carboxyl–Amine Ionic Interactions

Self-Healing, Self-Adhesive Strain Sensors Made with Carbon Nanotubes/Polysiloxanes Based on Unsaturated Carboxyl–Amine Ionic Interactions

The Dispersion and Coagulation of Negatively Charged Ca2Nb3O10 Perovskite Nanosheets in Sodium Alginate Dispersion

Extra-Soft Self-Healable Supramolecular Silicone Elastomers from Bis-Amide-PDMS Multiblock Copolymers Prepared by Aza-Michael Reaction

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