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Search Publications by: Charles C. Han ()

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Displaying 26 - 50 of 55

Structure and Morphology Development in Syndiotactic Polypropylene During Isothermal Crystallization and Subsequent Melting

December 1, 2001
Author(s)
Z G. Wang, X H. Wang, B S. Hsiao, R A. Phillips, Brian Rodriguez, S Srinivas, Haonan Wang, Charles C. Han
Structure and morphology development during isothermal crystallization and subsequent melting of syndiotactic polypropylene (sPP) was studied by time-resolved simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) methods

Time-Resolved Isothermal Crystallization of Absorbable PGA-co-PLA Copolymer by Synchrotron Small-Angle X-Ray Scattering and Wide-Angle X-Ray Diffraction

October 1, 2001
Author(s)
Z G. Wang, X H. Wang, B S. Hsiao, S Andjelic, D Jamiolkowski, J McDivitt, J Fischer, J Zhou, Charles C. Han
The isothermal crystallization behavior of absorbable dyed and undyed PGA-co-PLA copolymers was investigated by time-resolved simultaneous synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) methods. The morphological

Early Stage Crystallization in Poly (Ethylene-Co-Hexene) by SAXS/WAXD, DSC, OM and AFM

August 1, 2001
Author(s)
G Z. Wang, Haonan Wang, K Shimizu, Charles C. Han, B S. Hsiao
Isothermal crystallization in the early stages of one short-chain branching polyethylene, PEH, is examined by time-resolved SAXS/WAXD, DSC, optical microscope and AFM. WAXD showed a rapid decrease of the inter-chain distance in the amorphous phase at the

Multiple Lateral Length Scales in Phase-Separating Thin Film Polymer Blends

May 1, 2001
Author(s)
Haonan Wang, R J. Composto, Erik K. Hobbie, Charles C. Han
The interplay of phase separation, preferential wetting, and capillary instability in thin film polymer blends is investigated using composition-profiling and surface-imaging techniques. The phase-separating films exhibit a unique morphology with two

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