Details

Autor(en) / Beteiligte

• Self, Jeffrey L.
• Dolinski, Neil D.
• Zayas, Manuel S.
• Read de Alaniz, Javier
• Bates, Christopher M.

Titel

Brønsted-Acid-Catalyzed Exchange in Polyester Dynamic Covalent Networks

Ist Teil von

• ACS macro letters, 2018-07, Vol.7 (7), p.817-821

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The effect of catalyst strength on polyester–alcohol dynamic covalent exchange was systematically studied using Brønsted acids and a low-T g poly­(4-methylcaprolactone) vitrimer formulation. Relaxation times, activation energies, and Arrhenius prefactors are correlated with pK a. Strong protic acids induce facile network relaxation at 25 °C on the order of 104–105 s, significantly faster than Lewis acid alternatives that function only above 100 °C. Activation energies span 49–67 kJ/mol and increase as pK a decreases. The opposite trend is observed with the Arrhenius prefactor. We anticipate that the quantitative understanding of Brønsted acid effects disclosed herein will be of utility in future studies that exploit acid-catalyzed dynamic covalent bond exchange.