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Search Publications by: Li Piin Sung (Fed)

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Displaying 51 - 75 of 110

Revealing the Interphase in Polymer Nanocomposites

March 16, 2011
Author(s)
Mauro Zammarano, Paul H. Maupin, Li Piin Sung, Jeffrey W. Gilman, Douglas M. Fox
Morphological characterization of polymer nanocomposites is a fundamental challenge that is complicated by multiple length scales. Here, we report a technique for high-throughput monitoring of interphase and dispersion in polymer nanocomposites based on

Long-Term Performance of Nano-Filled Polymeric Materials: Effect of ZnO Nanoparticles on Photodegradation of a Waterborne Polyurethane Coating

July 8, 2009
Author(s)
Xiaohong Gu, Dongmei Zhe, Minhua Zhao, Guodong Chen, Nhieu Ly, Paul E. Stutzman, Li Piin Sung, Tinh Nguyen, Joannie W. Chin
Polymers are widely used as exterior coatings in buildings, bridges, aircrafts and automobiles for both protection and aesthetic purposes. However, the service life of the applied coatings is limited due to the photodegradation of polymers induced by

Effects of filler type and content on mechanical properties of photopolymerizable composites determined using a two-dimensional gradient platform

February 5, 2009
Author(s)
Sheng Lin-Gibson, Li Piin Sung, Haiqing Hu, Aaron M. Forster, Nancy J. Lin
Photopolymerizable dental composites have complex processing conditions and multi-component formulations that affect the final properties. Combinatorial screening is a useful approach for evaluating multiple properties of the composites. A single test

Comparing Analytical Methods for Detecting and Characterizing Nanoparticles in Formulated Products

October 1, 2008
Author(s)
Katherine M. Tyner, Anna M. Wokovich, William H. Doub, Lucinda F. Buhse, Li Piin Sung, Stephanie S. Watson, Nakissa Sadrieh
To understand the extent of consumer exposure to nanomaterials as well as how nanomaterials impact consumer goods, it is necessary to detect and characterize nanomaterials in unmodified final products. Although there are pathways to characterize

Modulus and Chemical Mapping of Multi-layer Coatings

October 1, 2008
Author(s)
Aaron M. Forster, Chris A. Michaels, Li Piin Sung, Justin Lucas
Thermoplastic olefins (TPO) are polymeric materials utilized for interior and exterior automotive parts. These materials are often painted to enhance appearance and protect the soft TPO substrate. TPO materials posses a low surface energy due to the

Interfacial Characterization of Multiple Layer Coatings on Thermoplastic Olefins (TPO)

May 30, 2008
Author(s)
Aaron M. Forster, Chris A. Michaels, Justin Lucas, Li Piin Sung
Thermoplastic olefins (TPO) have made significant inroads as polymeric materials for interior and exterior automotive parts. Spray applied chlorinated polyolefins (CPO) are often used to improve paint adhesion to the low surface energy TPO substrates. The

Chemical and Physical Characterization of Poly(p-phenylene-2,6-benzobisoxazole) Fibers Used in Body Armor: Temperature and Humidity Aging

November 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Cyril Clerici, Amanda L. Forster, M Oudina, Li Piin Sung, Kirk D. Rice
In recent years, poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers have become prominent in high strength applications such as body armor, ropes and cables, and recreational equipment. The objectives of this study were to expose woven PBO body armor

Mechanical Properties of Nanocomposite Latex Films via Instrumented Indentation

September 6, 2006
Author(s)
Aaron M. Forster, Stephanie S. Watson, Laura Johnson, Li Piin Sung
Inorganic particles, introduced into networked or glassy polymer films, have been used to increase the stiffness of films as a function of pigment loading. Latex films often contain inorganic pigments to increase the opaqueness of the film and to act as UV

Load-Displacement Relations for Nanoindentation of Viscoelastic Materials

August 2, 2006
Author(s)
Chien-Kuo Liu, S H. Lee, Li Piin Sung, Tinh Nguyen
A model based on the Burgers viscoelastic concept has been developed to describe the nanoindentation behaviors of polymeric materials. An analytical solution of displacement at the indenter tip has been derived based on the analog of the governing equation

Chemical and Physical Characterization of Poly(p-phenylene benzobisoxazole) Fibers Used in Body Armor

May 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Amanda L. Forster, Xiaohong Gu, Tinh Nguyen, Kirk D. Rice, Walter J. Rossiter Jr, S J. Scierka, John R. Sieber, Paul E. Stutzman, Li Piin Sung
Problems with the performance and durability of body armor based on poly(p-phenylene benzobisoxazole (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that was less than 8 months was penetrated by a bullet. Mechanical testing of