| 초록 |
Nanoscale phenomena in polymer nanocomposites (PNCs) are originated from large interfacial areas of nanoparticles. Hence, the dispersion of nanoparticles is reported to be critical in order to modify various PNCs properties at low nanoparticles loading. Herein, we prepared thermoplastic polyurethane (TPU) - iron oxide nanoparticles nanocomposites by rapid precipitation (RP) to secure nanoscale dispersion that are compared with conventional solvent evaporation (SE). Neat TPU is known to consist with soft and hard segment corresponding to aliphatic groups in polyol and urethane groups, respectively. The presence of these two domains were clearly observed from TGA and SE method resulted in similar phase behavior of the PNCs. Conversely, the inclusion of only 2 wt% of nanoparticles via RP resulted in a convolution of soft and hard segments. Structure-property relationship of these PNCs will be further discussed by investigating the dispersion state of nanoparticles via SAXS and TEM. |
