The Characteristics of Shape Memory in Composite of PU/PS Hybrid System Crosslinked by Polyhedral Oligomeric Silsesquioxane (POSS)
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초록
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Shape memory materials maintain its arbitrary shape and are restored to their original shape by external stimuli. Some of shape memory polymers (SMP) are restored by temperature and their recovery strength is weaker than that of the shape memory metals (SMM). Nanoparticles chemically bonded to SMP show excellent shape recovery power. POSS is a nanoparticle with Si-O-Si cage structure containing organic functional groups. In this study, Polyurethane (PU) was prepared from MDI and different length of PEG and POSS was used as a crosslinking agent. PS was blended using two methods. One is that PS was blended into the PU crosslinked by POSS. The other is in-situ method that polymerization of styrene and gelation can be occurred at the same time. The composite of PU/PS hybrid system containing POSS were analyzed by GPC, NMR, FT-IR, DSC, DMA, TGA, impact, tensile and flexion test.