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Search Publications by: Charles C. Han (Assoc)

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Displaying 76 - 100 of 110

Polymer-Clay Nanocomposite Materials: Solution and Bulk Properties

January 1, 2001
Author(s)
G Schmidt, A Nakatani, Paul Butler, V Ferreiro, Alamgir Karim, Charles C. Han
The influence of shear on viscoelastic polymer-clay solutions was investigated by means of small-angle neutron scattering (SANS) under shear. SANS measured the shear-induced orientation of polymer and platelets. With increasing shear rate an anisotropic

Cessation of Spherulitic Growth in Phase-Separating Polyolefin Blends

August 1, 2000
Author(s)
Haonan Wang, Charles C. Han
The Blends of two statistical copolymers of ethylene/hexene (PEH) and ethylene/butene (PEB) exhibit both phase separation and crystallization transitions. Using optical microscopy (OM) and small angle light scattering (SALS), we demonstrate that the

Neutron Reflectivity Study of Diblock Formation During Reactive Blending Processes

August 1, 2000
Author(s)
Makoto Hayashi, H Grull, A R. Esker, M J. Weber, Li Piin Sung, Sushil K. Satija, Charles C. Han, TT Hashimoto
In a series of neutron reflectivity experiments, we studied the fundamental process of diblock formation during reactive blending processes of an immiscible blend comprised of normal polysulfone (hPSU) containing 30 % reactive endgroup-modified deuterated

Shear Orientation of a Visoelastic Polymer-Clay Solution

August 1, 2000
Author(s)
G Schmidt, A Nakatani, Paul Butler, Alamgir Karim, Charles C. Han
The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence (δn) and small-angle neutron scattering (SANS). Oscillatory shear showed a linear viscoelastic region and flow occured at higher stresses