| 초록 |
In this research, one-step bulk polymerization method is used to synthesize the PU matrix foam. The PU matrixes are prepared by the reaction of prepolymers, such as hydroxy terminated polybutadiene (HTPB), polycaprolactone triol (PCL) and ether modified dimethylsiloxane (PDMS), and isocyanate isophorone diisocyanate (IPDI) in the presence of different hollow particles (HGM H25, HOM 100MCA, mix of H25 and 100MCA) volume percentage ranging from 0 to 75¬%. The viscoelastic behavior in flexible polyurethane composites has a relationship between the recoverability the foam’s shape and behavior after the composites were affected by compression or fatigue. To understand the viscoelastic behavior of the polyurethane foam, the relaxation stress, the compression set, the cyclic compression and the cyclic stress relaxation test are investigated. |
