Thermally self-healing silicone-based networks with potential application in recycling adhesives

Gou, Zhiming; Zuo, Yujing; Feng, Shengyu

doi:10.1039/c6ra14659g

Cited by 32 publications

(21 citation statements)

References 31 publications

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“…However, because they require energy-intensive and polluting processes to synthesize such as using carbothermal reduction approaches, , natural degradation is not an ideal pathway for disposal. Therefore, methods that either increase their longevity through self-healability, − or other recycling processes are ideal.…”

Section: Introductionmentioning

confidence: 99%

Full Circle Recycling of Polysiloxanes via Room-Temperature Fluoride-Catalyzed Depolymerization to Repolymerizable Cyclics

Rupasinghe

Furgal

2021

ACS Appl. Polym. Mater.

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Siloxane-based polymeric materials are widely used all over the world because of their chemical, mechanical, and thermal stability and due to their low toxicity. Despite their usefulness, the high energy cost used to make them is lost when they are discarded, wasting resources and energy. Practical and simple methods of recycling these materials are therefore required. However, the simplification of these methods is underdeveloped. The present techniques used to recycle silicone-based materials, such as polydimethylsiloxanes, often involve high temperatures/pressures and complicated setups. To address this issue, we have established an efficient room-temperature technique for the depolymerization of silicone-based polymers, elastomers, and resins in the presence of low catalytic amounts of fluoride in specific high swell organic solvents. The products primarily contain cyclic siloxane units (D 4 , D 5 , and D 6 ) as verified by GCMS and 29 Si nuclear magnetic resonance. Nearly any silicone resin can be depolymerized rapidly using these methods. Silicone-rich systems result in the best conversions and the highest quantity of identifiable cyclics, while complex resins resulted in complicated products alongside discernible cyclics. We have also repolymerized the products from this process to reform silicones via acid, base, and fluoride catalysis. This process has the potential for large-scale industrial processing because of the use of mild conditions and solvent recycling ability.

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Section: Introductionmentioning

confidence: 99%

Full Circle Recycling of Polysiloxanes via Room-Temperature Fluoride-Catalyzed Depolymerization to Repolymerizable Cyclics

Rupasinghe

Furgal

2021

ACS Appl. Polym. Mater.

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“…Researchers have also built-in recyclable cross-links to polysiloxanes to promote decross-linking as opposed to depolymerization of siloxane units. Gou et al modified tetramethyltetravinylcyclotetrasiloxane with furan by a thiol–ene reaction, forming thermally reversible cross-links via Diels–Alder reactions with bismaleimide . Decross-linking took place at 120 °C via the retro Diels–Alder reaction, forming a liquid that was reshaped and cooled to a solid.…”

Section: Introductionmentioning

confidence: 99%

Facile Approach to Recycling Highly Cross-Linked Thermoset Silicone Resins under Ambient Conditions

Krug

Asuncion²,

Laine

2019

ACS Omega

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Silicone resins are traditional thermoset polymers with an inorganic backbone, affording chemical inertness and high thermal stability, which also makes them inherently difficult to recycle by traditional methods. Here, we demonstrate that catalytic amounts of fluoride ion at room temperature solubilize highly cross-linked silicone resins initially cured up to 250 °C. After solubilization equilibria are achieved, solvent is removed to reform the polymer network. Coatings on aluminum substrates and monoliths of virgin and recycled silicone resins were evaluated for hydrophobicity, wear resistance, substrate adhesion, and thermal stability. Silicones recycled under optimized conditions retained nearly 100% wear resistance, thermal stability, and adhesion properties. In some instances, the recycled coatings offer properties superior to the initial materials.

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“…This composite was mechanically robust with tensile strength of 36 MPa by adding 0.5 wt % functionalized graphene nanosheets. With many excellent properties such as biocompatibility, stretchability, excellent hydrophobicity, and atomic oxygen resistance, polysiloxane has been used widely in fields of electronics, coatings, adhesives and composites . Rao et al .…”

Section: Introductionmentioning

confidence: 99%

Functionalized graphene‐reinforced polysiloxane nanocomposite with improved mechanical performance and efficient healing properties

Zhao

Jiang

Huang

2019

J of Applied Polymer Sci

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It is a challenge to design nanofiller reinforced self‐healing nanocomposites with both improved mechanical properties and highly efficient self‐healing properties. In this work, we report a self‐healing polysiloxane nanocomposite using furan‐functionalized graphene (G‐FA) as reinforcement based on Diels−Alder (DA) chemistry. The formed interactions between G‐FA and polysiloxane chains were reversible DA bonds, which negligibly affected the nanocomposites healing efficiency. The self‐healing polysiloxane nanocomposite with 6% G‐FA has a tensile strength of 0.25 MPa that was improved by 140% when compared to an elastomer without G‐FA. The healable polysiloxane nanocomposite recovered more than 90% of its tensile strength and 98% of its elongation‐at‐break, demonstrating that the nanocomposite exhibited highly efficient self‐healing properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47725.

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Thermally self-healing silicone-based networks with potential application in recycling adhesives

Abstract: A simpler approach is developed to obtain recyclable self-healing polysiloxane networks based on the thiol-ene reaction and Diels–Alder (DA) reaction which found potential applications in recyclable adhesives especially for glass bonding.

Cited by 32 publications

References 31 publications

Full Circle Recycling of Polysiloxanes via Room-Temperature Fluoride-Catalyzed Depolymerization to Repolymerizable Cyclics

Full Circle Recycling of Polysiloxanes via Room-Temperature Fluoride-Catalyzed Depolymerization to Repolymerizable Cyclics

Facile Approach to Recycling Highly Cross-Linked Thermoset Silicone Resins under Ambient Conditions

Functionalized graphene‐reinforced polysiloxane nanocomposite with improved mechanical performance and efficient healing properties

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