Volume 58, Issue 44 pp. 15883-15889
Research Article

Polyethylene Aerogels with Combined Physical and Chemical Crosslinking: Improved Mechanical Resilience and Shape-Memory Properties

Douriya Khedaioui

Douriya Khedaioui

Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616 Villeurbanne, France

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Dr. Christophe Boisson

Dr. Christophe Boisson

Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616 Villeurbanne, France

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Dr. Franck D'Agosto

Dr. Franck D'Agosto

Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616 Villeurbanne, France

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Dr. Damien Montarnal

Corresponding Author

Dr. Damien Montarnal

Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616 Villeurbanne, France

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First published: 09 September 2019
Citations: 38

Graphical Abstract

Taking shape: Polyethylene aerogels with low density and excellent mechanical resilience were obtained by combining and maximizing physical crosslinking, by crystallization, and chemical crosslinking, controlled by hydrosilylation reactions. These materials display remarkable shape-memory properties.

Abstract

While the introduction of polymers into aerogels strongly enhances their toughness, truly elastic monolithic aerogels which restore their dimensions upon extensive compression are still challenging to synthesize. In this context hydrophobic semi-crystalline polymers with low glass transition temperatures, and combined stiffness and flexibility, have only recently attracted attention. Shown here is that polyethylene aerogels with a low density, and combined chemical crosslinking and high crystallinity, display high moduli and excellent mechanical resilience. To maximize the crystallinity of these aerogels while maintaining a high crosslinking density, polyethylene networks with well-defined segments were synthesized by hydrosilylation crosslinking of telechelic, vinyl-functionalized oligomers obtained from catalyzed chain-growth polymerization. Recoverable deformations both above and below the melting temperature of polyethylene affords remarkable shape-memory properties.

Conflict of interest

The authors declare no conflict of interest.

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