Catalytic Control of the Vitrimer Glass Transition

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• 作者：Mathieu Capelot ; Miriam M. Unterlass ; Fran莽ois Tournilhac ; Ludwik Leibler
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：July 17, 2012
• 年：2012
• 卷：1
• 期：7
• 页码：789-792
• 全文大小：264K
• 年卷期：v.1,no.7(July 17, 2012)
• ISSN：2161-1653

文摘

Vitrimers, strong organic glass formers, are covalent networks that are able to change their topology through thermoactivated bond exchange reactions. At high temperatures, vitrimers can flow and behave like viscoelastic liquids. At low temperatures, exchange reactions are very long and vitrimers behave like classical thermosets. The transition from the liquid to the solid is reversible and is, in fact, a glass transition. By changing the content and nature of the catalyst, we can tune the transesterification reaction rate and show that the vitrimer glass transition temperature and the broadness of the transition can be controlled at will in epoxy-based vitrimers. This opens new possibilities in practical applications of thermosets such as healing or convenient processability in a wide temperature range.