Poly(ethylene 2,6-naphthalate)/MWNT nanocomposites prepared by in situ polymerization: Rheological and mechanical properties |
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Authors: | Min Ho Jee Jin Soo Lee Ju Yong Lee Young Gyu Jeong Doo Hyun Baik |
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Institution: | (1) Research Branch of Advanced Functional Materials, Institute of Microelectronic and Solid State Electronic, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China; |
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Abstract: | Poly(ethylene 2,6-naphthalate)/multi-walled carbon nanotube (PEN/MWNT) nanocomposites are prepared by in situ condensation polymerization in the presence of various acid-treated MWNT (a-MWNT) contents and their morphology, rheological
and mechanical properties are investigated as a function of the a-MWNT content. SEM image of a plasma-etched nanocomposite
exhibits that a-MWNTs are dispersed well in the PEN matrix by forming an interconnected network structure. Accordingly, rheological
properties such as complex viscosities and shear moduli of PEN/a-MWNT nanocomposites at the terminal region of low frequency
are much higher than those of pure PEN. Glass transition temperatures of nanocomposites also increase with the increment of
the a-MWNT content, which stems from the reduced chain mobility due to the specific interaction between a-MWNTs and PEN matrix.
Dynamic and tensile mechanical properties of nanocomposites are also higher than those of pure PEN and they increase with
the increment of the a-MWNT content. The highly improved mechanical properties of PEN/a-MWNT nanocomposites are explained
to originate from the interconnected network structure of a-MWNTs in PEN matrix as well as the strong interfacial adhesion
between a-MWNTs and PEN matrix. |
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