| 초록 |
In this study, the silicate nanotubes of the mineral halloysite, Al2Si2O5(OH)4, were used as reinforcement in polyurethane. The polyurethane/halloysite nanocomposites were synthesized by reaction NCO-terminated PU with APTES modified HNTs. The interfacial reaction, morphology, and the mechanical performance of the nanocomposites were investigated. The interfacial reactions between the halloysite nanotubes (HNTs) and polyurethane were revealed by FTIR and XPS. To illustrate the morphology of PU/halloysite composites, TEM analysis was performed. The static and dynamic mechanical properties of nanocomposites were characterized by UTM and DMTA, respectively. Also, shape memory effect was investigated by cycling test. These properties have significantly been improved with the increasing content of modified HNTs. It also showed that the nanocomposites with APTES modified HNTs are dispersed individually and uniformly in the PU matrix with strong urea bonding. |
