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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 language | English |
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Publication date | 2019 |
Number of pages | 1 |
Publication status | Published - 2019 |
Event | ACS Rubber Division International Elastomer Conference: 16th Student Colloquium - Cleveland, United States Duration: 8 Oct 2019 → 10 Oct 2019 |
Conference
Conference | ACS Rubber Division International Elastomer Conference |
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Country/Territory | United States |
City | Cleveland |
Period | 08/10/2019 → 10/10/2019 |
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Dive into the research topics of 'Soft elastomer without cross-linking shows excellent elasticity dominated by knotted rings and entanglements'. Together they form a unique fingerprint.Activities
- 1 Participating in or organising a conference
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2020 International Elastomer Conference
Hu, P. (Organizer)
20 Oct 2020Activity: Attending an event › Participating in or organising a conference
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