| 초록 |
Polymer nanocomposites show various properties according to dispersion quality even at identical filler-loading. So far there have been numerous researches to improve the dispersion quality whereas there have been relatively few those to assess the morphology states. In rheological measurements, storage modulus (G’) from SAOS (Small Amplitude Oscillatory Shear) test is the well-known parameter to represent dispersion quality as a result of lower scaling behavior with power (log G'∝n, n become less than 2 for polymer melt) at low frequencies. However, SAOS results are not enough to present the degree of dispersion quantitatively. In this study, NLR(Non-linear Linear viscoelastic Ratio) [1], originated from FT(Fourier Transform)-rheology, was introduced to assess the dispersion quality and compared plenty of polymer nanocomposites consisting of various combination of matrixes and filler. [1] Lim, H.T, K.H. Ahn, S.J. Lee, J.S. Hong, and K. Hyun, J. Rheol., 57, 767 (2013). |
