Rheology of Disentangled Multiwalled Carbon Nanotubes Dispersed in Uncured Epoxy Fluid
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- 作者：Kevin L. White ; Peng Li ; Yasuhiro Sumi ; Hung-Jue Sue
- 刊名：Journal of Physical Chemistry B
- 出版年：2014
- 出版时间：January 9, 2014
- 年：2014
- 卷：118
- 期：1
- 页码：362-371
- 全文大小：509K
- ISSN：1520-5207
文摘
The rheological behaviors of clustered and disentangled multiwalled carbon nanotubes (MWCNTs) dispersed in a stable, non-reactive Newtonian epoxy fluid have been investigated. Suspensions of untreated and chemically oxidized MWCNTs in epoxy show strong rate-dependent behavior and long-time elastic response that is characteristic of a flocculated microstructure. Suspensions of disentangled MWCNTs in epoxy were prepared by a functionalization reaction with nitrobenzene, and show distinct rheological behavior that is attributed to the motion and rotation of the individual nanoparticles. Characteristic features of the disentangled MWCNTs in epoxy are a lack of low-frequency plateau in storage modulus and shear thickening behavior at high shear rate. The rheological behavior is discussed on the basis of continuum-level predictions for the motion of individual, semiflexible fibers under shearing flows. Implications of MWCNT disentanglement on fundamental study and applications of MWCNT-filled systems are discussed.