Effect of the epoxyurethane modifier on the physicomechanical and electret properties of epoxy-based chemoelectrets cured in an electric field
DOI:
https://doi.org/10.33910/2687-153X-2025-6-4-176-181Keywords:
epoxy oligomer, polyaminoamide, epoxyurethane modifier, gel fraction, crosslinking degree, polarization, chemoelectret, tensile strength, Shore D hardnessAbstract
This study investigates the influence of the epoxyurethane oligomer PEF-3A as a modifier on the crosslinking degree, physicomechanical properties, and electret characteristics of epoxy-based materials synthesized under simultaneous curing and polarization in a constant electric field. Unpolarized samples and chemoelectrets with varying PEF-3A content (2.5–10.0 wt. %) were prepared using the DER-331 epoxy oligomer and the polyaminoamide hardener L-20. Results reveal that increasing PEF-3A content decreases crosslink density, tensile strength, and Shore D hardness due to steric hindrance and reduced network frequency. Electret properties such as surface potential and charge density display modest dependence on modifier concentration and stabilize during storage. Simultaneous curing and polarization enhance molecular dipole orientation, improving strength in chemoelectrets relative to unpolarized analogs.
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