Trap Entanglements by Intervening Polymerization Process

The mechanical properties of soft materials depend on the topology of polymer networks. Thus, access to the topology design is crucial in developing high-performance and optimized soft materials. This talk will present approaches that can intervene in radical polymerization processes to control the topology of polymer networks. First, I will show that the concentration of UV initiators and the intensity of UV light have distinct roles in the formation of topology and mechanical properties. Also, I will show that mechanical stimuli during the polymerization process can control the topology beyond the thermodynamic equilibrium. To demonstrate, highly entangled hydrogels are synthesized under such conditions, showing significant differences in topology as measured in the elastic and fracture properties. Both approaches extend the capability of topology design and the material property space, providing more opportunities in soft material design.