초록 |
Dispersion of nanoparticles in polymer matrices is a crucial factor to modify various material properties and to understand structure-property relationships of polymer nanocomposites. In consideration of large surface area-volume ratio, small interparticle distances and fast diffusion of nanoparticles, phase separation can easily be induced by conventional solvent evaporation. Herein, we show that rapid precipitation technique results in homogeneous dispersion of iron oxide nanoparticles in thermoplastic polyurethane (TPU) supported by TEM and SAXS analysis. Conversely, large degree of agglomeration was obtained from solvent evaporation. In case of homogeneous nanocomposites by rapid precipitation, we indeed observe the convolution of soft and hard segments of TPU unlike two distinct peaks found from neat TPU and heterogeneous nanocomposites by solvent evaporation from TGA. We are going to further study thermal and mechanical properties of polymer nanocomposites via DSC and DMA. |