Reactive extrusion additive manufacturing (REAM) is a process in which a motion-controlled nozzle mixes and immediately deposits a multi-part thermoset resin to create layered parts that cure rapidly in the ambient environment. By mixing particle-filled and neat resins on demand, it is possible to functionally grade both the material structure and the resulting properties of the parts. This research investigates a two-part shape memory polymer in which an epoxy resin is combined with a curing agent to yield a thermoset polymer part with structural integrity and shape memory properties. Magneto-active iron oxide particles are added to the epoxy resin to create a filled resin that is mixed on demand with neat epoxy resin and curing agent; control over the mixing and deposition results in a customized distribution of iron oxide content spatially within a part. After characterizing the shape memory properties of the matrix epoxy, the magneto-active composites are shape programmed and actuated via the application of thermal and magnetic fields, respectively, and the effect of the functional grading on the magneto-active properties of the shape memory polymer is demonstrated. Analytical models are derived to predict the magnetic field-responsive behavior of the thermoset composites.
All Science Journal Classification (ASJC) codes
- Biomedical Engineering
- Materials Science(all)
- Engineering (miscellaneous)
- Industrial and Manufacturing Engineering