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

被引:4
作者
Kim, Dae Hwan [1 ]
Won, You-Yeon [1 ]
机构
[1] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
carbon nanotubes; glass transition temperatures; nanocomposites; polyimides; reaction stoichiometry; MECHANICAL-PROPERTIES; NANOTUBES; POLYIMIDE; TEMPERATURE; COMPOSITES; FILMS; ACID;
D O I
10.1002/mren.201100027
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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.
引用
收藏
页码:45 / 56
页数:12
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