Journal
CHEM
Volume 7, Issue 3, Pages 670-685Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2021.02.003
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Funding
- Colorado State University (CSU)
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office (AMO)
- Bioenergy Technologies Office (BETO)
- National Renewable Energy Laboratory [DE-AC36-08GO28308]
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The article introduces a new hybrid monomer design strategy that combines high ceiling temperature (HCT) and low ceiling temperature (LCT) sub-structures within the same monomer to achieve high polymerizability and depolymerizability. This innovative approach resulted in a polymer with high performance properties, demonstrating that the HCT/LCT hybrid monomer strategy is a powerful method for designing circular polymers with conflicting properties.
Intrinsically recyclable polymers represent a circular economy approach to address plastics problems. However, the design of such circular polymers is challenged by unyielding trade-offs between the monomer's polymerizability and the polymer's depoly-merizability and performance properties. Here, we introduce a hybrid monomer design strategy that synergistically couples a high ceiling temperature (HCT) sub-structure for high polymerizability and performance properties with a low ceiling temperature (LCT) sub-structure for high depolymerizability and recyclability within the same monomer structure. Thus, structural hybridization between HCT e-caprolactone and LCT g-butyrolactone led to an offspring [3.2.1]bicyclic lactone, which exhibits both high polymerizability and depolymerizability, otherwise conflicting properties in a typical monomer. The resulting polymer becomes a high-performance material, and thermal transition temperatures are similar to 200 degrees C higher and tensile modulus 103 higher than its parent polymers. These results demonstrate that the HCT/LCT hybrid monomer strategy is a powerful approach for designing circular polymers where conflicting properties must be exploited and unified.
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