Overcoming the Low Driving Force in Forming Depolymerizable Polymers through Monomer Isomerization

Autor: Hanlin Chen, Junpeng Wang, Tze-Gang Hsu, Zhen Shi
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie. 133:25697-25702
ISSN: 1521-3757
0044-8249
DOI: 10.1002/ange.202111181
Popis: While depolymerizable polymers have been intensely pursued as a potential solution to address the challenges in polymer sustainability, most depolymerization systems are characterized by a low driving force in polymerization, which poses difficulties for accessing diverse functionalities and architectures of polymers. Here, we address this challenge by using a cyclooctene-based depolymerization system, in which the cis -to- trans alkene isomerization significantly increases the ring strain energy to enable living ring-opening metathesis polymerization at monomer concentrations ≥ 0.025 M. An additional trans -cyclobutane fused at the 5,6-position of the cyclooctene reduces the ring strain energy of cyclooctene, enabling the corresponding polymers to depolymerize into the cis -cyclooctene monomers. The use of excess triphenylphosphine was found to be essential to suppress secondary metathesis and depolymerization. The high-driving-force living polymerization of the trans -cyclobutane fused trans -cyclooctene system holds promise for developing chemically recyclable polymers of a wide variety of polymer architectures.
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje