Research the Сuring Processes of Multifunctional Composites Based on Orthophthal Polyester Oligomers

This study investigates the сuring kinetics and curing behavior of multifunctional multispectral composites based on orthophthalic polyester oligomers reinforced with whiskers and fiberglass. The influence of initiator type and concentration, accelerator content, and functional fillers on the viscosity evolution, gelation time, and exothermic curing profile was systematically evaluated. Two radical initiators - LUPEROX K1 S and PROMOX P200TX - were compared in formulations containing 10–20 wt.% titanium dioxide–based whiskers and 40–50 wt.% fiberglass. Rheokinetic measurements demonstrated that the PROMOX P200TX initiator provides a wider gelation window, enabling improved filler wetting and technological flexibility. Digital monitoring of the curing exotherm using an ESP32based system revealed that PROMOX P200TX significantly lowers the peak curing temperature, allowing the curing process to proceed under milder thermal conditions without a pronounced exothermic peak. The results confirm that adjusting the initiator concentration and filler content makes it possible to control the сuring process, optimize gelation kinetics, and improve the mechanical integrity of the final composite. The findings offer practical guidelines for designing highperformance multispectral polymer composites with predictable curing behavior and enhanced technological adaptability.