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Author: Li Piin Sung

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1. A Quantitative Study of Nanoparticle Release from Nanocoatings Exposed to UV Radiation
Published: 4/7/2014
Authors: Li Piin Sung, Deborah L Stanley, Justin M Gorham, Savelas A Rabb, Xiaohong Gu, Lee Lijian Yu, Tinh Nguyen
Abstract: Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in ...

2. Smoldering in Flexible Polyurethane Foams: the Effect of Foam Morphology
Published: 12/18/2012
Authors: Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer, Rick D Davis, Jeffrey W Gilman, Li Piin Sung, Douglas Matthew Fox, Shivani Navin Mehta
Abstract: Smoldering is a self-sustaining heterogeneous oxidation reaction that induces a slow, low temperature, flameless combustion. Flexible polyurethane foams (PUF) are prone to smoldering due to their high air permeability, low density and high specific ...

3. Revealing the Interphase in Polymer Nanocomposites
Published: 3/16/2011
Authors: Mauro Zammarano, Paul Hutsell Maupin, Li Piin Sung, Jeffrey W Gilman, Douglas Matthew Fox
Abstract: 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 ...

4. Effects of Temperature and Humidity on the Photodegradation of TiO2-Filled Acrylic Urethane Films
Published: 10/28/2009
Authors: Stephanie S Watson, Tarek Marray, Yongyan Pang, Li Piin Sung
Abstract: Metal oxide fillers, such as titanium dioxide (TiO2) are commonly used in building and construction applications and are added to increase the opacity and/or to improve the mechanics of a coating. However, their photoreactivity can contribute to deg ...

5. Mapping Heterogeneity in NanoTiO2/Polymer Coatings Using Confocal Microscopy and Depth Sensing Indentation
Published: 10/14/2009
Author: Li Piin Sung
Abstract: The purpose of this study is to develop relevant metrology to measure the appropriate structure-property relationship at a proper length scale to understand the interplay between nanoparticle and polymeric matrix. In this paper, we present the prelim ...

6. Quantification of cell response to polymeric composites using a two-dimensional gradient platform
Published: 8/6/2009
Authors: Nancy J Lin, Haiqing Hu, Li Piin Sung, Sheng Lin-Gibson
Abstract: A simple and straightforward screening process to assess the toxicity and corresponding cell response of dental composites would be useful prior to extensive in vitro or in vivo characterization. To this end, gradient composite samples were prepared ...

7. Long-Term Performance of Nano-Filled Polymeric Materials: Effect of ZnO Nanoparticles on Photodegradation of a Waterborne Polyurethane Coating
Published: 7/8/2009
Authors: Xiaohong Gu, Dongmei Zhe, Minhua Zhao, Guodong Chen, Nhieu Ly, Paul E Stutzman, Li Piin Sung, Tinh Nguyen, Joannie W Chin
Abstract: 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 ...

8. Characterizing the Dynamic Behavior of Nano-TiO2 Agglomerates in Suspensions by Photocorrelation Spectroscopy
Published: 4/22/2009
Authors: I-Hsiang Tseng, Stephanie S Watson, Li Piin Sung
Abstract: Metal oxide nanoparticles are small but easily form agglomerates in suspension, depending on the strength of particle-particle and particle-media interactions. To understand the agglomeration behavior of nanoparticles in media and relate to it to pro ...

9. Combinatorial characterization of photopolymerizable composites: Effect of filler type and content on properties
Published: 3/22/2009
Authors: Li Piin Sung, Aaron M Forster, Haiqing Hu, Nancy J Lin, Sheng Lin-Gibson
Abstract: Multi-component formulations coupled with complex processing conditions govern the final properties of photopolymerizable dental composites. In this study, a single test substrate was fabricated to support multiple formulations with a gradient in deg ...

10. Effects of filler type and content on mechanical properties of photopolymerizable composites determined using a two-dimensional gradient platform
Published: 2/5/2009
Authors: Sheng Lin-Gibson, Li Piin Sung, Haiqing Hu, Aaron M Forster, Nancy J Lin
Abstract: 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 te ...

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