Fluorosilicones as High Temperature Elastomers

Pierce, O. R.; Kim, Yung K.

doi:10.5254/1.3544816

Cited by 19 publications

(5 citation statements)

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“…Another important starting point that allowed us carrying out the present study is the discovery and use of a chaotropic salt first applied to carry out silanol polycondensation of PDMSs in bulk [33]. We found out previously that this complex allows dissolving elastomers strongly crosslinked by physical interactions, e.g.…”

Section: Why and How Studying Sulfoned Silicone Polymersmentioning

confidence: 99%

Syntheses and Supramolecular Associations of New Phosphonated and Sulfoned Silicone Block and Grafted Copolymers

Pouget,

Holgado Garcia,

Kostjuk

et al. 2024

Preprint

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This paper summarizes some works exploiting the ate-type addition of electron-withdrawing monomers to hydrogenosiloxane groups so as to generate new silicone materials. Two types of monomers were oligomerized onto silicone backbones, namely unsaturated phosphonate and sulfone monomers. Phosphonated silicones are thermally more resistant than conventional silicones and can be transformed into amphiphilic polymers after selective ester hydrolysis. Sulfoned silicones generate solid supramolecular elastomers thanks to the strong pseudo-ionic interactions in play between sulfone groups. Rheology and modulated DSC show a solid/viscoelastic transition around 175°C, which allows using these thermoplastic materials on a larger scale than conventional silicone urea copolymers. These results open new avenues in the generation of silicone block- and grafted-copolymers with unique functionality and properties.

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Section: Why and How Studying Sulfoned Silicone Polymersmentioning

confidence: 99%

Syntheses and Supramolecular Associations of New Phosphonated and Sulfoned Silicone Block and Grafted Copolymers

Pouget,

Holgado Garcia,

Kostjuk

et al. 2024

Preprint

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“…They perform well at low temperatures and have favorable non-stick properties, low vapor permeability [16], low toxicity [10] and they are largely considered environmentally inert [3]. Fluorosilicones have properties that are similar to general silicone elastomers and offer an even greater advantage in their solvent resistance [9]. They show only slight attack when subjected to most solvents, fuels, and oils over a temperature range beyond the capabilities of any nonfluorosilicone elastomer [8].…”

Section: Introductionmentioning

confidence: 98%

Multi-Method Characterization of Compression Set in Fluorosilicone O-Rings

Harley

Mayer

Glascoe

et al. 2014

Silicon

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Fluorosilicone o-rings with varying levels of compression set were investigated with a variety of methods. Low field NMR experiments were able to elucidate if the sample had taken a compression set; however, this technique did not have the sensitivity to quantify the relative level of compression set of the o-ring. Water sorption isotherms probe the interior void structure through void space occupation and while complex, the sorption isotherms indicate a systematic loss of void volume with increasing compression set. Similarly, variable temperature 129 Xe NMR experiments indicate an elimination of macroscopic void space with increasing compression. The NMR techniques, being noninvasive, have a unique ability to assess the service status of an o-ring in real time.

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“…Hydrosilylation, the addition of silicon hydride bonds across unsaturated molecules (Scheme 1), has industrial applications in silicone-based materials 1–8 such as resins, adhesives, oils, lubricants, and coatings. 9–11 In 1957, Speier's catalyst H 2 PtCl 6 / i PrOH 12 was employed until it was further improved in 1973 with Karstedt's platinum(0) complex containing a vinyl-siloxane ligand.…”

Section: Introductionmentioning

confidence: 99%