Raman spectroscopy of pre-strained VHB 4910 elastomer towards actuator application

Dielectric elastomers are the potential material to configure soft electromechanical actuators and similar modules. But, understanding the relationship between molecular structures and properties of such elastomers in real-time is a powerful and lacking tool, important to consider when properties are targeted to improve by tailoring (macro)molecular arrangement. Here, molecular bonds within VHB 4910 dielectric elastomer are explored using techniques of Raman spectroscopy. Identified bonds are correlated well with electromechanical properties and macromolecular characteristics. Then the effects of pre-strain known to influences material behavior are comprehended in the context of molecular-level structural-adaptation. Intermolecular bonds revealed for hard segments, soft segments and acrylate structure are found certainly sensitive for applied strain, persist ideology of chain entanglement towards strain-induced crystallization. These results are experimentally consistent and the work may help to focus specific structure to adapt user-defined properties.