Robust Self-Healing Adhesives Based on Dynamic Urethane Exchange Reactions DOI
Lillian M. Felsenthal, Subeen Kim, William R. Dichtel

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(42), P. 57687 - 57694

Published: Oct. 15, 2024

Thermoset polyurethanes (PUs) have been successfully reprocessed as covalent adaptable networks (CANs) by catalyzing carbamate exchange. Here we extend bond exchange beyond the internal network cross-links to create a dynamic urethane adhesive. Interfacing PU CANs substrates with nucleophilic functional groups creates adhesives capable of reversible transcarbamoylation substrate, which has not demonstrated previously CAN adhesives. Two types thermoset films were synthesized, one containing green catalyst Zr(tmhd)4 and other no catalyst. Although otherwise identical in chemical properties, indicated FT-IR spectroscopy mechanical thermal analysis (DMTA), film showed behavior through stress relaxation analysis. When evaluated an adhesive, exhibited self-healing properties retained its adhesive strength for five cycles, is attributed bonding glass substrate. This work expands industrially relevant structural demonstrates their potential value application that presently employs PUs single-use materials.

Language: Английский

Robust Self-Healing Adhesives Based on Dynamic Urethane Exchange Reactions DOI
Lillian M. Felsenthal, Subeen Kim, William R. Dichtel

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(42), P. 57687 - 57694

Published: Oct. 15, 2024

Thermoset polyurethanes (PUs) have been successfully reprocessed as covalent adaptable networks (CANs) by catalyzing carbamate exchange. Here we extend bond exchange beyond the internal network cross-links to create a dynamic urethane adhesive. Interfacing PU CANs substrates with nucleophilic functional groups creates adhesives capable of reversible transcarbamoylation substrate, which has not demonstrated previously CAN adhesives. Two types thermoset films were synthesized, one containing green catalyst Zr(tmhd)4 and other no catalyst. Although otherwise identical in chemical properties, indicated FT-IR spectroscopy mechanical thermal analysis (DMTA), film showed behavior through stress relaxation analysis. When evaluated an adhesive, exhibited self-healing properties retained its adhesive strength for five cycles, is attributed bonding glass substrate. This work expands industrially relevant structural demonstrates their potential value application that presently employs PUs single-use materials.

Language: Английский

Citations

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