Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202210023
Keywords
Commodity Monomer; Isoprene; Polymerization; Rare-Earth Catalysts; Self-Healing Materials
Categories
Funding
- RIKEN
- Ministry of Science and Technology (MOST) of China under the National Key R&D Program of China [2022YFE0103800]
- JSPS KAKENHI [20K05483, JP22K05135]
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The synthesis of self-healing polymers from simple commodity dienes, such as isoprene, using catalyst-controlled polymerization has shown to produce excellent self-healing elastomers. The self-healability is attributed to nanoscale heterogeneities formed by microphase separation of hard 3,4-segments from a flexible cis-1,4-segment matrix.
The creation of self-healing polymers from commodity olefins is of great interest and importance but has remained a challenge to date. We report here for the first time the synthesis of self-healing polymers by catalyst-controlled polymerization of a simple commodity diene, isoprene. We found that polyisoprenes having an appropriate mixture (ca. 70/30) of 3,4- and cis-1,4-microstructures synthesized by using a half-sandwich scandium catalyst could act as excellent self-healing elastomers without any external intervention. The unprecedented self-healability could be ascribed to nanoscale heterogeneities formed by microphase separation of the relatively hard 3,4-segments from a flexible cis-1,4-segment matrix. The hydrogenated polyisoprenes (without C=C bonds) with the analogous microstructures also exhibited excellent mechanical and self-healing properties, further demonstrating that even simple polyolefins can be made self-healable if the microstructures are appropriately regulated.
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