In Situ Polymerized Carbon Nanotube/Polyimide Nanocomposites: Effect of Reaction Stoichiometry on the Glass Transition Properties of the Nanocomposites

Title
In Situ Polymerized Carbon Nanotube/Polyimide Nanocomposites: Effect of Reaction Stoichiometry on the Glass Transition Properties of the Nanocomposites
Authors
Dae Hwan Kim원유연
Keywords
carbon nanotubes; glass transition temperatures; nanocomposites; polyimides; reaction stoichiometry
Issue Date
2012-01
Publisher
MACROMOLECULAR REACTION ENGINEERING
Citation
VOL 6, NO 1, 45-56
Abstract
A series of in situ polymerized CNT/PI nanocomposite materials synthesized at a fixed diamine-to-dianhydride monomer feed ratio with varying concentrations of added –COOH-functionalized CNT is studied. It is found that the glass transition temperature of the nanocomposite varies non-monotonically with CNT concentration. To determine the origin of this behavior, the molecular weights of the matrix polymers are measured by the intrinsic-viscosity method. The functional-group density of the CNT material is determined by potentiometric titration. The results confirm that the glass transition of the CNT/PI system depends on the concentration of the CNT filler through its influence on the functional group stoichiometry and thus on the molecular weight of the polycondensation product.
URI
http://pubs.kist.re.kr/handle/201004/44664
ISSN
1862832X
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KIST Publication > Article
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