Soft elastomer without cross-linking shows excellent elasticity dominated by knotted rings and entanglements

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Abstract

Conventional elastomer elasticity origins from the permanent elastomer networks formed by cross-links. Recently, an extremely soft silicone elastomer without cross-links has been shown to exhibit excellent strain recovery from extreme elongation (>5000%), namely 82% after 10 cycles [1]. This observation challenges conventional elasticity of cross-linked elastomers because a network with virtually no covalent crosslinks should not be able to recover strain to such extent. In this work, the microscopic structure of this elastomer was identified by use of nuclear magnetic resonance and size-exclusion chromatography. It was found that the elastic properties were dominated by the knotted rings and entanglements. Knotted rings are permanently trapped and form the network and can therefore be regarded as pseudo cross-linking. The knotted rings and entanglements in the elastomer can be controlled well by changing the preparation conditions.
Original languageEnglish
Publication date2019
Number of pages1
Publication statusPublished - 2019
Event Rubber Division, ACS International Elastomer Conference: 16th Student Colloquium, - cleveland, United States
Duration: 8 Oct 201910 Oct 2019

Conference

Conference Rubber Division, ACS International Elastomer Conference
CountryUnited States
Citycleveland
Period08/10/201910/10/2019

Cite this

Hu, P., Huang, Q., Jeppe Madsen, P., & Skov, A. L. (2019). Soft elastomer without cross-linking shows excellent elasticity dominated by knotted rings and entanglements. Abstract from Rubber Division, ACS International Elastomer Conference, cleveland, United States.