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Int. J. Mol. Sci. 2010, 11(4), 1352-1364; doi:10.3390/ijms11041352
Article

Dynamic Rheological Studies of Poly(p-phenyleneterephthalamide) and Carbon Nanotube Blends in Sulfuric Acid

1
,
1,* , 1, 1, 1 and 2,*
1 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China 2 National Renewable Energy Laboratory, Golden, CO 80401, USA
* Authors to whom correspondence should be addressed.
Received: 11 February 2010 / Revised: 17 March 2010 / Accepted: 18 March 2010 / Published: 31 March 2010
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Abstract

We have studied the dynamic scanning of liquid-crystalline(LC) poly(p-phenyleneterephthalamide) sulfuric acid (PPTA-H2SO4) solution, and its blend with single-walled carbon nanotubes (SWNTs), by using a flat plate rotational rheometer. The effects of weight concentration and molecular weight of PPTA, as well as operating temperature, on dynamic viscoelasticity of the PPTA-H2SO4 LCsolution system are discussed. The transition from a biphasic system to a single-phase LC occurs in the weight concentration range of SWNTs from 0.1% to 0.2%, in which complex viscosity reaches the maximum at 0.2 wt% and the minimum at 0.1 wt%, respectively, of SWNTs. With increasing SWNT weight concentration, the endothermic peak temperature increases from 73.6 to 79.9 °C. The PPTA/SWNT/H2SO4 solution is in its plateau zone and storage modulus () is a dominant factor within the frequency (ω) range of 0.1–10 rad/s. As w increases, the rises slightly, in direct proportion to the w. The loss modulus (G´´) does not rise as a function of ω when ω < 1 s−1, then when ω > 1 s−1 G´´ increases faster than , yet not in any proportion to the ω.
Keywords: liquid crystalline (LC) solution; single-walled carbon nanotubes (SWNTs); rheology liquid crystalline (LC) solution; single-walled carbon nanotubes (SWNTs); rheology
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Cao, Y.; Liu, Z.; Gao, X.; Yu, J.; Hu, Z.; Liang, Z. Dynamic Rheological Studies of Poly(p-phenyleneterephthalamide) and Carbon Nanotube Blends in Sulfuric Acid. Int. J. Mol. Sci. 2010, 11, 1352-1364.

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