Pressure-Sensitive Adhesives Based on CO 2 -based Polymer: Structure-Regulated Viscoelasticity.

Abstract

Pressure-sensitive adhesives (PSAs) are polymers with tunable viscoelastic properties, primarily determined by the structural configuration of their polymer chains. In this study, we report the development of a CO2-based poly(carbonate-ether) for use in PSAs applications, synthesized via the copolymerization of CO2 and propylene oxide. The viscoelastic properties of the resulting polymer can be precisely modulated by varying its molecular weight (Mn) and carbonate unit (CU) content, yielding excellent comprehensive performance without the need for additional tackifiers or additives. Notably, PCE9, with a Mn of 90 kg/mol and a CU content of 50%, exhibited optimal performance, achieving a 180° peel strength of 5.70 N/cm with adhesive failure upon peel-off, and maintaining static shear adhesion for up to 2760 minutes. This development of CO2-based copolymers for PSAs applications not only represents a novel approach to the utilization of CO2-derived materials but also provides an innovative pathway for the sustainable advancement of the PSAs industry.