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1. Smoldering in Flexible Polyurethane Foams: the Effect of Foam Morphology
Mauro Zammarano, Szabolcs S. Matko, Roland H. Kraemer, Rick D Davis, Jeffrey W Gilman, Li Piin Sung, Douglas Matthew Fox, Shivani Navin Mehta
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 ...
2. Revealing the Interphase in Polymer Nanocomposites
Mauro Zammarano, Paul Hutsell Maupin, Li Piin Sung, Jeffrey W Gilman, Douglas Matthew 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 ...
3. Effects of Temperature and Humidity on the Photodegradation of TiO2-Filled Acrylic Urethane Films
Stephanie S Watson, Tarek Marray, Yongyan Pang, Li Piin Sung
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 ...
4. Mapping Heterogeneity in NanoTiO2/Polymer Coatings Using Confocal Microscopy and Depth Sensing Indentation
Li Piin Sung
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 ...
5. Quantification of cell response to polymeric composites using a two-dimensional gradient platform
Nancy J Lin, Haiqing Hu, Li Piin Sung, Sheng Lin-Gibson
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 ...
6. Long-Term Performance of Nano-Filled Polymeric Materials: Effect of ZnO Nanoparticles on Photodegradation of a Waterborne Polyurethane Coating
Xiaohong Gu, Dongmei Zhe, Minhua Zhao, Guodong Chen, Nhieu Ly, Paul E Stutzman, Li Piin Sung, Tinh T. 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 ...
7. Characterizing the Dynamic Behavior of Nano-TiO2 Agglomerates in Suspensions by Photocorrelation Spectroscopy
I-Hsiang Tseng, Stephanie S Watson, Li Piin Sung
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 ...
8. Combinatorial characterization of photopolymerizable composites: Effect of filler type and content on properties
Li Piin Sung, Aaron M Forster, Haiqing Hu, Nancy J Lin, Sheng Lin-Gibson
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 ...
9. Effects of filler type and content on mechanical properties of photopolymerizable composites determined using a two-dimensional gradient platform
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 te ...
10. Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings
Aaron M Forster, Peter Krommenhoek, Li Piin Sung, Chris A Michaels, Kurt Wood
Instrumented indentation was used to investigate the mechanical properties of coatings for automotive and architectural applications. First, the mechanical properties in the cross-section of a multi-layer acrylic-melamine automotive coating subjected ...