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Construction of Polyurethane-imide/Graphene Oxide Nanocomposite Foam with Gradient Structure and Its Thermal Mechanical Stability

Li, Chengjie, Hui, Bing, Ye, Lin
Industrial & engineering chemistry process design and development 2018 v.57 no.41 pp. 13742-13752
cell walls, composite polymers, compression strength, ferromagnetism, foams, graphene oxide, iron oxides, magnetic fields, mechanical properties, nanocomposites, nanohybrids, nanoparticles, process design, storage modulus, temperature, thermal degradation, thermal stability
Graphene oxide (GO)@Fe₃O₄ nanohybrid with ferromagnetism was prepared and polyurethane-imide copolymer (PUI)/GO@Fe₃O₄ nanocomposite foams with gradient structure were first fabricated under a magnetic field. Fe₃O₄ nanoparticles intercalated into GO layers with high grafting ratio, resulting in complete exfoliation of GO in matrix. For the composite foam, the average cell size, cell wall thickness and apparent density gradually decreased along magnetic field direction, forming gradient cell structure in foam. Both mechanical property and thermal stability of foam were remarkably improved by addition of GO@Fe₃O₄. Compared with A region, in B region with enriched distribution of GO@Fe₃O₄, the compressive strength and modulus increased by 12.5 and 7.0%, respectively. The thermal degradation temperature, storage modulus, and Tg were obviously improved, indicating enhancement of thermal mechanical stability of PUI along magnetic field, revealing formation of gradient distribution of thermal mechanical property in foam, which showed potential application prospective in aerospace and defense area.