| 초록 |
Polymeric nanocomposites show a variety of properties depending on dispersion quality even at same filler-loading. So far there have been plenty of researches to enhance dispersion quality whereas there have been relatively few those to assess morphology states. In rheological measurements, storage modulus (G’) from SAOS (small amplitude oscillatory shear) test is the well-known parameter to represent dispersion quality. G’ at low frequencies (terminal region) exhibits higher values and lower scaling behavior with power (log G'∝n, n become less than 2 for polymer melt) than matrix polymer as filler content increases. However, SAOS results are not enough to present the degree of dispersion quantitatively. In this study, we introduced new parameter NLR, suggested by Lim[1], that indicates degree of dispersion by ratio of intrinsic nonlinearity Q0 at MAOS to complex modulus G* at SAOS. [1] Lim, H.T, K.H. Ahn, S.J. Lee, J.S. Hong, and K. Hyun, J. Rheol., 57, 767 (2013). |
