Fabrication and Properties of a New Reactive Diluent for Cationic UV Curing

The reactive diluent prepared by siloxane modified Trimethylene oxide can improve the performance of the UV curing system. Therefore, 1,7-bis [(3-ethyl-3-methoxyoxacylobutane) propyl] octadecylosiloxane (BEMOPOMTS) was synthesized from diethyl carbonate, trimethylopropanes, allyl bromide, and 1,1,3,3,5,5,7,7-octadecylosiloxane as the main raw materials. BEMOPOMTS can be used as reactive diluents in the field of cationic UV curing. It has good thermal stability, and the addition of BEMOPOMTS significantly improves the tensile strength and elongation at break of epoxy resin. Compared with the pure epoxy resin, adding 20% BEMOPOMTS increased the elastic modulus by 25% to 677 MPa.