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Search Publications by

Li Piin Sung (Fed)

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Displaying 1 - 25 of 107

Evaluation of Microstructure of BaTiO 3 -Polymer Composites by Confocal Microscopy

October 12, 2021
C. K. Chiang, Li Piin Sung, R Popielarz, Jan Obrzut
Laser scanning confocal microscopy has been applied to examine the distribution of BaTiO3 particles in ceramic-polymer composite films. The thin-slice images of the thickness of the order of one micron allowed us to visualize the micron-size particles and

Controlling Bicontinuous Structures through Solvent Segregation Driven Gel

February 16, 2021
Yuyin Xi, Juscelino Leao, Qiang Ye, Ronald S. Lankone, Li Piin Sung, Yun Liu
The past decade has seen increased research interests in studying bicontinuous structures formed by the colloidal self-assembly due to their many useful applications. A new type of colloidal gel, solvent segregation driven gel (SeedGel), has been recently

Graphene/Polymer Nanocomposite Degradation by Ultraviolet Light: The Effects of Graphene Nanofillers and their Potential for Release

September 10, 2020
David Goodwin, Shih Jia Shen, Ronald S. Lankone, Wendel Wohlleben, Tinh Nguyen, Li Piin Sung, Francois Perreault, Ana Barrios
The ultraviolet (UV)-induced degradation of graphene/polymer nanocomposites was investigated in this study. Specifically, the effect of few-layer graphene nanofillers on the degradation of a thermoplastic polyurethane (TPU) and the release potential of

The Impact and Fate of Graphene Oxide in Graphene Oxide/Polymer Nanocomposites Exposed to Ultraviolet Irradiation

August 11, 2020
David G. Goodwin, Trinny Lai, Yadong Lyu, Chen Yuan Lu, Alejandro Campos, Vytautas Reipa, Tinh Nguyen, Li Piin Sung
Ultraviolet (UV) radiation, heat and moisture can lead to polymer degradation outdoors but the effect of graphene oxide (GO) nanofiller incorporation on this process is unknown. Since GO can improve the mechanical, barrier, and thermal properties of a

Bayesian Hierarchical Models for Service Life Prediction of Polymers

August 5, 2020
Adam L. Pintar, Christopher C. White, Li Piin Sung
Service life prediction for polymers remains an elusive goal. In this chapter, a general methodology first described in a previous study \cite{pintar2018predicting} is recapitulated and extended. A central component of the methodology is a Bayesian

Polymer Surface/Interface Consortium 2018 Workshop Report

July 29, 2020
Ronald S. Lankone, Li Piin Sung, David G. Goodwin, Andrew Fairbrother
The Polymer Surface/Interface (PSI) consortium held a two-day workshop at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD on October 17th & 18th, 2018 titled, “The development of characterization tools, test methods, modeling

Macroscopic degradation behaviors of polyethylene under the influence of UV radiation and temperature

February 17, 2020
Hsiang C. Hsueh, Jae H. Kim, Sara Orski, Andrew Fairbrother, Deborah Jacobs, Donald L. Hunston, Christopher C. White, Li Piin Sung, Lakesha Perry
Accelerated weathering tests were performed to investigate the effects of multiple ultraviolet (UV) light intensities and temperatures on the tensile behavior of high-density polyethylene (HDPE). In the macroscopic degradation behavior of HDPE, tensile

Graphene oxide/waterborne polyurethane nanocoatings: Effects of graphene oxide content on performance properties

January 15, 2020
David G. Goodwin, Coralie Bernard, Xiaohong Gu, Mat Celina, Marc R. Nyden, Deborah S. Jacobs, Li Piin Sung, Tinh Nguyen
Graphene oxide (GO) is a good nanofiller candidate for waterborne coatings because of its outstanding physical and mechanical properties, good dispersibility in water, and low cost. Here, we report on the performance of a one-part, water-borne polyurethane

Evaluating performance, degradation, and release behavior of a nanoform pigmented coating after natural and accelerated weathering

December 6, 2019
Ronald S. Lankone, David G. Goodwin, Li Piin Sung, Emmanuel Ruggiero, Klaus Vilsmeier, Philipp Mueller, Sorin Pulbere, Katie Challis, Yuqiang Bi, Paul Westerhoff, James Ranville, David H. Fairbrother, Wendel Wohlleben
Pigments with nanoscale dimensions are added to exterior coatings to achieve desirable color and gloss properties. The present study compared the performance, degradation, and release behavior of an acrylic coating that was pigmented by a nanoform of Cu

Validating Predictive Models with Outdoor Data

October 17, 2019
Christopher C. White, Donald L. Hunston, Li Piin Sung, Hsiang C. Hsueh, Adam L. Pintar, Deborah S. Jacobs
The NIST service life prediction program has demonstrated success in producing validated predictions for the property change resulting from outdoor exposure for a range of polymer systems including Epoxy, Polyethylene, Polyester, Polyethylene terephthalate

Accelerated Weathering Parameters for Some Aromatic Engineering Thermoplastics

May 24, 2019
Li Piin Sung, James E. Pickett, Olga Kuvshinnikova, Brett Ermi
Samples of polycarbonate (PC), poly(butylene terephthalate) (PBT), a PC/PBT blend, and poly(styrene-co-acrylonitrile) (SAN), all containing 3 % TiO2 (by mass), were exposed in the NIST (National Institutes of Standards and Technology) SPHERE (Simulated

Temperature and light intensity effects on the photodegradation of high-density polyethylene

May 11, 2019
Andrew W. Fairbrother, Hsiang C. Hsueh, Jae Hyun Kim, Deborah S. Jacobs, Lakesha N. Perry, David G. Goodwin, Christopher C. White, Stephanie S. Watson, Li Piin Sung
The photodegradation of polymers poses a serious challenge to their outdoor application, and results in significant financial loss due to early or unexpected system failure. A better understanding of their degradation kinetics aids the improvement of

Effects of Consumer Use Practices on Nanosilver Release from Commercially Available Food Contact Materials

October 23, 2018
Susana Addo Ntim, Samuel R. Norris, David Goodwin, Jens Breffke, Keana Scott, Li Piin Sung, Treye Thomas, Gregory O. Noonan
Migration evaluation involving nano-enabled food contact materials (FCMs) mostly focus on potential nanoparticle release from new unused products. This may not represent consumer use practices encountered by the FCMs in their lifecycle. In order to

Fundamentals and characterizations of scratch resistance on automotive clearcoats

September 11, 2018
Li Piin Sung, Linqian Feng, Nadia Benhamida, Pierre Morel, Andrew T. Detwiler, Jon M. Skelly, Leslie T. Baker, Deepanjan Bhattacharya
As original equipment manufacturers (OEMs) strive to deliver improved coating performance with a sustainable footprint, opportunities for innovation are emerging, particularly on improving mechanical properties, appearance, and solids content. Resistance

Detection and Quantification of Graphene Family Nanomaterials in the Environment

March 5, 2018
David Goodwin, Adeyemi Adeyele, Li Piin Sung, Kay Ho, Robert Burgess, Elijah Petersen
An increase in production of commercial products containing graphene-family nanomaterials (GFNs) has led to concern over their release into the environment. The fate and potential ecotoxicological effects of GFNs in the environment are currently unclear