Preparation And Properties Of Thermoelectr-responsive Polyurethane/Graphene/Epoxy Resin Shape Memory Composite

In recent years, the shape memory material is very popular in many industries such as aerospace, medical, textile and engineering industries. In particular, the shape memory polymer materials have become a hot topic, because they have good shape memory properties, adequate raw materials and varieties. With the understanding of shape memory polymers, we need to understand the electric drive, optical drive, magnetic drive and so on, in addition to our traditional thermal-driven research. We need to further break through in loop mode, even try to study bidirectional and multi-loop modes, adapt to promote the progress of industry. In this paper, the graphene/polyurethane shape memory composite, modified graphene/epoxy composite and polyurethane/graphene/epoxy shape memory composite by in-situ polymerization have been prepared. Morever, the influence of the preparation programs on thermal, mechanical and the shape memory properties have been explored in detail. The electrically driven, two-way deformed effects of some samples had been achieved. The main results are summarized as follows:1. The electric-drive of SM-4.0S (graphene/polyurethane shape memory composite) had been achieved. The thermal decomposition temperature was higher than that of pure polyurethane about 50℃, breaking stress increased 34.2Mpa, modulus increased 47.5Mpa, shape memory performance was up to 94%. The conductivity of SM-8.0S was up to 8.53×10-3S/m. The two-way shape memory recovery process of the sandwich-like structure SM0-4.0S/PU/SM0-8.0S composites had been achieved at 80V voltage.2. When rGO mass fraction was 0.8%, the Rf and Rr of graphene/epoxy shape memory composite material were 96.4% and 95.3% respectively. When FG was 1.0%, the Rf and Rr were 97.6% and 95.7%. It has been shown that the binding force between the silane coupling agent modified graphene and epoxy resin was stronger after the dispersion and compatibility was improved, which could be conducive to shape memory properties.3. The mechanical property test of polyurethane/graphene/epoxy composite indicated that the form of interpenetrating network could enable polyurethane polymers and epoxy to produce complementary effect, resulting in a positive synergies and mutual capacitance. When PU-EF-20 was used as the matrix and graphene was 1.0% of composite, Rf and Rr were as high as 95.5% of the shape memory performance.