2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Orientation of polymer semi-crystalline structures in polymer carbon nanotubes nanocomposites

G.Y. Georgiev, Y. Cabrera, M. Cronin, C. Rocheleau, B. Feinberg, P. Cebe
Assumption College and TUFTS University, US

Keywords:
polymer, isotactic polypropylene, carbon nanotubes, semicrystaline

Abstract:
Polymer Carbon Nanotube Composites (PCNs) are the largest commercial application of carbon nanotubes (CNT) in nanotechnology. Isotactic Polypropylene (iPP) is one of the best model systems to study in this field because iPP/CNT PCNs can form alpha, beta, and gamma crystallographic phases under a variety of crystallization conditions: nonisothermal and isothermal melt crystallization, shear, stress, fiber extrusion, etc. The morphological structure and the orientation of the crystals can also be finely controlled under those conditions. We complement Microscopic Transmission Ellipsometry studies with other techniques: Differential Scanning Calorimetry, X-ray scattering and dielectric spectroscopy. The advantages of transmission optical ellipsometry are that it is a quick and convenient analytical method for materials characterization. Through measuring the azimuthal angle orientation of the fast optical axis of ordered structures relative to a reference direction and their effect on optical retardation, R, it is providing rich information about the internal structure of the material, the crystallographic form, the crystal orientation, and the degree of perfection of the crystals.


Nanotech 2008 Conference Program Abstract