Study of a Polydimethylsiloxane (PDMS) Elastomer Generated by γ Irradiation: Correlation Between Properties (Thermal and Mechanical) and Structure (Crosslink Density Value)

Meléndez-Zamudio, Miguel; Villegas, Abelardo; González-Calderón, J. A.; Meléndrez, R.; Meléndez‐Lira, M.; Cervantes, Jorge

doi:10.1007/s10904-017-0503-2

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…The decomposition temperature at 5% weight loss is 298, 321, and 332 °C for PDMS‐PU‐1, PDMS‐PU‐2, and PDMS‐PU‐3, respectively. This is because thermal stability of PDMS is superior to PU . The bond strength of silicon oxygen bond is higher than CC bond, so that the degradation temperature of PDMS is significantly higher than that of polymer containing CC bond.…”

Section: Resultsmentioning

confidence: 99%

“…The interaction between the silicones molecular is very weak, because the polarities of the siloxane bonds is offset from each other in the ordered molecular structure of the helical crimp of the linear polysiloxane . And the nonpolar groups are arranged in the outer side of the spiral of the main chain of silicon, the polarity of the silicone bonds from the shield effect, so the entire polysiloxane molecular showed nonpolar, intermolecular force is weak, showing low cohesive energy density, so the mechanical property of silicone is poor . This is the very reason why the tensile strength of samples becomes weaker and weaker along with the ever‐increasing contents of PDMS.…”

Section: Resultsmentioning

confidence: 99%

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Heat‐triggered poly(siloxane‐urethane)s based on disulfide bonds for self‐healing application

et al. 2018

J of Applied Polymer Sci

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Polydimethylsiloxane (PDMS) is one of the most widely employed silicon‐based polymers for its high flexibility, low usage temperature, excellent water resistance, outstanding electrical insulting property, and physiological inert, etc. However, the covalent‐bonded SiO bonds are unable to heal automatically when damaged, which would result in the failure of the materials and devices. Disulfide bond based polymers show high healing efficiency at moderate temperature and have been investigated intensively. Herein, we report a PDMS‐based polyurethane self‐healing polymer (PDMS‐PU) modified with disulfide bonds, which exhibited a reinforced thermal stability, excellent stretchability, and satisfactory self‐healing ability. The effect of different ratio of PDMS and disulfide bond contents on the elastomer properties was investigated. With the increase of PDMS content, the decomposition temperature of the PDMS‐PU‐3 (332 °C) elastomer with highest content of PDMS was increased by 34 °C compared to PDMS‐PU‐1 (298 °C) with lowest content of PDMS and exhibited a largest elongation at break of 1204%. PDMS‐PU‐1 with highest content of disulfide bond possessed a highest healing efficiency of 97%. The results indicated the PDMS‐PU elastomers can be used as self‐healing flexible substrate for flexible electronics. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46532.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Heat‐triggered poly(siloxane‐urethane)s based on disulfide bonds for self‐healing application

et al. 2018

J of Applied Polymer Sci

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“…The PDMS precursor exhibited a thickness of 700 ± 100 nm on PET fibers (Figure S2). The cross-linking mechanism of PDMS exposed to high-energy radiation has been intensively studied previously. ,, Generally, the PDMS precursor simultaneously underwent dissociation, polymerization, and silicification in an Ar plasma atmosphere, while the dissociation includes dehydrogenation and demethylation. Compared with oxygen plasma treatment or chemical cross-linking, a new peak of r (CH 2 ) at 779.4 cm –1 appeared after Ar plasma treatment (Figure S3).…”

Section: Results and Discussionmentioning

confidence: 99%

Earthworm-Inspired Ultradurable Superhydrophobic Fabrics from Adaptive Wrinkled Skin

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Wrapped by periodically wrinkled skin, soft earthworm shows excellent robustness against sticky soil. Mimicking this deformation adaptability, here, we report an ultradurable superhydrophobic fabric by exploiting the formation of adaptive, soft wrinkled poly(dimethylsiloxane) (PDMS) skins. Uniform wrinkles are created on woven fabric fibers due to the surface instability of PDMS coating with a cross-linking gradient induced by Ar plasma treatment. Both the surface topography of wrinkles and the viscoelasticity of the underlying compliant layer to release stress endow the treated superhydrophobic fabrics with extraordinary durability, withstanding 800 standard laundries or 1000 rubbing cycles under 44.8 kPa. Additionally, superhydrophobic fabrics are self-healable after heating or plasma treatment. This insight of engineering soft skins with periodic submicron surface topography and gradient modulus provides a pathway for the design of ultradurable, multifunctional wearables.

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“…The number of elastic chains per volume η FR has been calculated as described elsewhere, see Supporting Information Section III for details. − …”

Section: Methodsmentioning

confidence: 99%

Impact of the Network Density of Rough Poly(dimethylsiloxane)-Model Systems on the Hydrophobicity Assessment and Dynamic Wetting Behavior

Praße

Kornhuber

Voit

et al. 2022

ACS Appl. Polym. Mater.

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Silicone-based elastomers are widely in use as a housing material for composite insulators, e.g., for high-voltage outdoor applications. Especially, their outstanding hydrophobic properties make them suitable for high-voltage applications since conductive electrolytic paths on the surface that result in short circuits need to be avoided. While static hydrophobicity can be analyzed by contact-angle measurements, the analysis is more difficult for moving droplets. In this paper, we show that not only dynamic contact-angle measurements should be used to evaluate the hydrophobic properties of insulator materials, but also the occurrence of the so-called pearling effect must be considered. This effect describes the instability of accelerated drops resulting in small, pinned droplets on a material surface. We observed that occurrence of the pearling effect is dependent not only on external parameters (such as droplet volume) but also on the network density of the silicone elastomer. We have synthesized variable silicone elastomers with tunable network structures by reacting vinyl-terminated poly(dimethylsiloxane) and tetrakis(dimethylsiloxy)silane via hydrosilylation. The network properties are varied by controlling the stoichiometric balance between the monomers. The well-defined materials obtained that way allowed a careful examination of the impact of network densities (i.e., mechanical properties) and low-molecular-weight residues (sol) on the hydrophobic behavior in terms of dynamic wetting.

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Study of a Polydimethylsiloxane (PDMS) Elastomer Generated by γ Irradiation: Correlation Between Properties (Thermal and Mechanical) and Structure (Crosslink Density Value)

Cited by 14 publications

References 34 publications

Heat‐triggered poly(siloxane‐urethane)s based on disulfide bonds for self‐healing application

Heat‐triggered poly(siloxane‐urethane)s based on disulfide bonds for self‐healing application

Earthworm-Inspired Ultradurable Superhydrophobic Fabrics from Adaptive Wrinkled Skin

Impact of the Network Density of Rough Poly(dimethylsiloxane)-Model Systems on the Hydrophobicity Assessment and Dynamic Wetting Behavior

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