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In Situ Polymerized Carbon Nanotube/Polyimide Nanocomposites: Effect of Reaction Stoichiometry on the Glass Transition Properties of the Nanocomposites
Author(s) -
Kim Dae Hwan,
Won You Yeon
Publication year - 2012
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201100027
Subject(s) - nanocomposite , glass transition , polyimide , materials science , monomer , carbon nanotube , in situ polymerization , polymer chemistry , polymer , polymerization , condensation polymer , stoichiometry , chemical engineering , diamine , composite material , chemistry , layer (electronics) , engineering
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.