Preparation of Shape Memory Polymers Based on Covalent Adaptable Networks

초록

Novel chemically cross-linked thermoset polymers containing covalent adaptable networks were prepared. They were reshaped and reprocessed while maintaining the network integrity. By controlling adaptable networks, they also maintained shape memory capability. This reversible property was triggered by exchange reaction through a lot of cross-link points in polymer network. To enhance the strength of mechanical properties, bifunctional epoxy monomer was used with suitable trifunctional epoxy monomer as crosslinker into the polymer matrix. Appropriate stoichiometry of crosslinkers was carefully probed. The glass transition temperature of the shape memory polymers was changed with the relative concentration of trifunctional or bifunctional monomer. The mechanical properties and thermal stability were analyzed by dynamic mechanical analysis, thermogravimetric analysis and differential scanning calorimetry.