In Situ Polymerized Carbon Nanotube/Polyimide Nanocomposites: Effect of Reaction Stoichiometry on the Glass Transition Properties of the Nanocomposites
- In Situ Polymerized Carbon Nanotube/Polyimide Nanocomposites: Effect of Reaction Stoichiometry on the Glass Transition Properties of the Nanocomposites
- Dae Hwan Kim; 원유연
- carbon nanotubes; glass transition temperatures; nanocomposites; polyimides; reaction stoichiometry
- Issue Date
- MACROMOLECULAR REACTION ENGINEERING
- VOL 6, NO 1, 45-56
- 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.
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