Room-temperature autonomous self-healing glassy polymers with hyperbranched structure
- 26 May 2020
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 117 (21), 11299-11305
- https://doi.org/10.1073/pnas.2000001117
Abstract
Glassy polymers are extremely difficult to self-heal below their glass transition temperature (T-g) due to the frozen molecules. Here, we fabricate a series of randomly hyperbranched polymers (RHP) with high density of multiple hydrogen bonds, which show Tg up to 49 degrees C and storage modulus up to 2.7 GPa. We reveal that the hyperbranched structure not only allows the external branch units and terminals of the molecules to have a high degree of mobility in the glassy state, but also leads to the coexistence of "free" and associated complementary moieties of hydrogen bonds. The free complementary moieties can exchange with the associated hydrogen bonds, enabling network reconfiguration in the glassy polymer. As a result, the RHP shows amazing instantaneous self-healing with recovered tensile strength up to 5.5 MPa within 1 min, and the self-healing efficiency increases with contacting time at room temperature without the intervention of external stimuli.This publication has 56 references indexed in Scilit:
- Polymers with autonomous life-cycle controlNature, 2016
- Self-healing polymeric materialsChemical Society Reviews, 2013
- Multiphase design of autonomic self-healing thermoplastic elastomersNature Chemistry, 2012
- Silica-Like Malleable Materials from Permanent Organic NetworksScience, 2011
- Self-Healing MaterialsAdvanced Materials, 2010
- A Self-Healing ElastomerAngewandte Chemie, 2008
- Self-healing and thermoreversible rubber from supramolecular assemblyNature, 2008
- Self-healing materials with microvascular networksNature Materials, 2007
- A Thermally Re-mendable Cross-Linked Polymeric MaterialScience, 2002
- Autonomic healing of polymer compositesNature, 2001