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• Liu, Z
• Gao, X
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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

Yutong Cao ¹ , Zhaofeng Liu ^1,* , Xianghua Gao ¹ , Junrong Yu ¹ , Zuming Hu ¹  and Ziqi Liang ^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; in revised form: 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 (G´) is a dominant factor within the frequency (ω) range of 0.1–10 rad/s. As w increases, the G´ 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 G´, yet not in any proportion to the ω.

Keywords: liquid crystalline (LC) solution; single-walled carbon nanotubes (SWNTs); rheology

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