Controlling Dynamic Bond Exchange Kinetics and Transition Temperatures of Covalent Adaptable Networks using Removable Small Molecule Additives
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Covalent adaptable networks (CANs) have attracted great attention as a reusable analogue of thermosetting polymers. Thermally activated network exchange reaction allows topology rearrangement at temperatures above topology freezing transition temperature. As the network exchange kinetic is a key factor governing properties of CANs, substantial efforts have been made to controlling the kinetics by synthesizing CANs equipped with new bond exchange chemistries. However, the ability to easily tailor the physical state and properties of a material is often more desirable than that to precisely define its molecular structure. In this presentation, to this end, a synthesis-free approach to controlling the bond exchange rates and transition temperatures of a model CAN, poly(β-amino esters), will be reported by incorporating small organic molecules. The molecules are readily removable from the matrix, therefore it is possible to retain properties prior to the incorporation.