Polyurea-crosslinked alginate (X-M-alginate; M: Co, Ni, Cu) aerogels, prepared from the corresponding M-alginate wet-gels and aromatic triisocyanate Desmodur RE, are precursors for metal- nitrogen-doped carbon (X-M-C) aerogels.

Interfacial polymerization techniques offer a versatile route for microcapsule synthesis. We designed a microfluidic process to synthesize monodisperse polyurea microcapsules (PUMCs); the microcapsules are formed by an interfacial polymerization of isocyanate dissolved in the oil and an amine dissolved in water. We measure the mechanical properties of the capsule as well as transport properties...

The electromagnetic parameters of a composite material can depend on the environment in which the material is cured. Nondestructive monitoring of composite materials during curing offers a means of assessing whether or not the final product will function as specified. Microwave measurements of complex permittivity and permeability have been made on a polyurea/polyurethane hybrid containing ferr...

We use microfluidics to continuously produce monodisperse polyurea microcapsules (PUMCs) having either aqueous or nonaqueous cores. The microcapsule shells are formed by the reaction between an isocyanate, dissolved in oil, and an amine, dissolved in water, at the surface of oil-in-water or water-in-oil drops immediately as they are formed. Different microcapsule morphologies can be generated u...

The core of this research is separated into three domains, the ultrahigh strain rate response elastomeric polymers, laser-induced shock waves , and terahertz time-domain spectroscopy (THz-TDS). Elastomers, e.g., polyurea, constitute an advance class materials suitable for many applications, specifically in high impact loading scenarios, thus, a wave (LSW) experimental technique used to investig...

8.1 CHAPTER SUMMARY Segmented polyurethane and polyurea copolymers whose hard segments are based on only a single diisocyanate molecule are thermoplastic; they can exhibit useful structural properties if the level of symmetry and/or cohesiveness of the hard microdomains is carefully selected. These parameters control the hard segments’ ability to establish long-range connectivity and percolatio...

Abstract The application of micro-/nano-capsules in construction industries has been rising over the past decade. Polyurea with tunable chemical and morphological structure are interesting polymers to prepare used construction. polyurea micro-/nano-capsule is capable be tailored via bulk emulsion or microfluidic method. Important factors for production micro/nano-capsules rate fabrication havin...

Polyurea (PU) is a versatile high strain rate elastomeric polymer that has attracted significant interest due to its utility as blast and ballistic resistant coating. Predictive design of PU materials, particularly with focus on structure, complicated by the occurrence both pressure effects in response impact. To help elucidate behavior under such conditions, we sought characterize microstructu...