Dynamically Cross-Linked Polydimethylsiloxane Networks with Ambient-Temperature Self-Healing

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• 作者：Willi Schmolke ; Norman Perner ; Sebastian Seiffert
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：December 22, 2015
• 年：2015
• 卷：48
• 期：24
• 页码：8781-8788
• 全文大小：460K
• ISSN：1520-5835

文摘

Dynamically cross-linked polymer networks have promising potential to serve as self-healing materials, but this is often limited to occur at elevated temperature. We overcome this limitation by refinement of an earlier approach to synthesize dynamically cross-linked polydimethylsiloxane networks such to show stress relaxation and self-healing at room temperature on short time scales, which we probe by oscillatory shear rheology and piercing experiments. Our studies reveal a direct correlation between the amount of anionic groups in the polymer networks and their stress-relaxation and self-healing rates, allowing these materials to be designed in a rational fashion.