Trimethylene oxide is primarily used as a monomer in the production of polymers and copolymers. It is particularly valuable in the synthesis of polyethers, which are utilized in various industrial applications, including the manufacture of elastomers, adhesives, and coatings. Additionally, it serves as a precursor in organic synthesis, contributing to the creation of specialty chemicals and pharmaceuticals. Its reactivity and structural properties make it suitable for use in chemical research and development, where it aids in the exploration of new materials and compounds.