| 초록 |
Poly(vinyl alcohol) (PVA) has long been studied in a wide range of applications due to its water solubility, non-toxicity, biodegradability, and high biocompatibility. Specifically, aramid nanofiber (ANF) is considered as a captivating contender in supporting PVA-based materials because of a high miscibility with PVA and stiff nature of p-aramid backbone. In addition, the embedding of hydrophobic ANF into the PVA matrix significantly enhance the mechanical properties. In this study, therefore, we studied the rheological properties of PVA/ANF nanocomposites solutions in dimethyl sulfoxide (DMSO) in terms of the ANF content. As a result, the neat PVA solution indicated lower Newtonian flow region (LNFR) followed by shear thinning. As the ANF content increases, however, the LNFR disappeared and the Bingham behavior took place. moreover, the addition of ANF above 4 wt% sharply raised the viscosity of the solutions, resulting from the gelation. |
