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Search Publications by: Li Piin Sung (Fed)

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Displaying 76 - 100 of 110

Relating Gloss Loss to Topographical Features of a PVDF Coating

October 6, 2004
Author(s)
J Faucheu, Li Piin Sung, K Wood, Jonathan W. Martin
Semi-gloss commercial poly(vinylidene fluoride) (PVDF) coatings typically have 60o gloss values between 20 and 50. Gloss is affected by PVDF crystallite structures and by the pigmentation. In this paper, we have demonstrated that for some pigmented PVDF

Effect of Microstructure of Fluorinated Acrylic Coatings on UV Degradation Testing

September 1, 2004
Author(s)
Li Piin Sung, Silvia Vicini, D L. Ho, L Hedli, C Olmstead, Kurt Wood
This paper presents research results on the relationships between the microstructure and the performance/weatherability of fluoropolymer/acrylic coatings. We studied fluoropolymer/acrylic blends of identical composition, prepared as films using three

Advanced Techniques for Nanocharacterization of Polymeric Coating Surfaces

July 1, 2004
Author(s)
Xiaohong Gu, Tinh Nguyen, Li Piin Sung, Mark R. VanLandingham, Y C. Jean, Jonathan W. Martin
The applications of AFM and nanoindentation on study of surface property of polymeric coatings have been demonstrated. The surface microstructure of several coatings was characterized using tapping mode AFM, and the morphological change of coatings during

Finite-Size Effects on Surface Segregation in Polymer Blend Films Above and Below the Critical Point of Phase Separation

March 1, 2004
Author(s)
H Grull, Li Piin Sung, Alamgir Karim, Jack F. Douglas, Sushil K. Satija, Makoto Hayashi, H Jinnai, TT Hashimoto, Charles C. Han
We investigate the influence of temperature and confinement on surface segregation in thin films of deuterated polybutadiene and polyisoprene near the critical point for phase separation. Neutron reflectivity measurements show that polyisoprene enriches at

Modification of Thin Film Phase Separation by a Surfactant

March 25, 2003
Author(s)
Li Piin Sung, Alamgir Karim, Jack F. Douglas, Charles C. Han
Phase separation in thin films leads to the formation of surface patterns (holes, bumps, and bicontinuous surface features) which depend on the film composition. These features are interpreted to arise from surface tension variations within the film that

Surface and Interface Properties of UV-Exposed PVDF/PMMA-CO-PEA Blends

March 5, 2003
Author(s)
Xiaohong Gu, Li Piin Sung, D L. Ho, Chris A. Michaels, D Nguyen, Y C. Jean, Tinh Nguyen
The surface and interface of PVDF blended with different amounts of poly (methyl methacrylate) and poly (ethyl acrylate) copolymer (PNMA-co-PEA) have been investigated before and after exposure to UV light. Dry free films having athickness of approximately

Surface Finish and Sub-Surface Metrology

January 1, 2003
Author(s)
Theodore V. Vorburger, Ndubuisi George Orji, Li Piin Sung, T Rodriguez
Surface finsih affects the performance of a wide variety of manufactured products ranging from road surfaces and ships to mechanical parts, microelectronics, and optics. Accordingly roughness values can vary over many orders of magnitude. A variety of

Advances in Materials and Mechanics

December 1, 2002
Author(s)
K P. Chong, Mark R. VanLandingham, Li Piin Sung
Mechanics and materials are essential elements in all of the transcendent technologies that are the primary drivers of the twenty first century and in the new economy. The transcendent technologies include nanotechnology, microelectronics, information

Optical Reflectance of Metallic Coatings: Effect of Aluminum Flake Orientation

September 1, 2002
Author(s)
Li Piin Sung, Maria E. Nadal, M E. McKnight, Egon Marx, B Laurenti
The orientation of platelet-like pigments in coatings is affected by the processing conditions resulting in appearance variations of the final product. A set of aluminum-flake pigmented coatings having different flake orientations was pre-pared using

Investigation of Morphology and Interface in Polymer Composite Thin Films

July 1, 2002
Author(s)
C. K. Chiang, Li Piin Sung, R Popielarz
Laser scanning confocal microscopy (LSCM) has been applied to examine the filler particles and their distribution in BaTiO3-polymer composite films. We have measured thin-slice images of the composite films at various depths from the film surface and

Nanocharacterization of Surface and Interface of Different Epoxy Networks

January 1, 2002
Author(s)
Xiaohong Gu, D T. Raghavan, D L. Ho, Li Piin Sung, Mark R. VanLandingham, Tinh Nguyen
The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with

Phase Separation in Ultrathin Polymer Films

January 1, 2002
Author(s)
Alamgir Karim, Jack F. Douglas, Li Piin Sung, B D. Ermi
Changes in phase separation morphology occurring in thin polymer blend films is discussed. These changes are especially large when the films are thinner than the scale of the bulk material interfacial profile width. Under these circumstances, phase

Effect of Aluminum Flake Orientation on Coating Appearance

November 1, 2001
Author(s)
Li Piin Sung, Maria E. Nadal, M E. McKnight, Egon Marx, R Dutruc-Rosset, B Laurenti
The orientation of platelet-like pigments in coatings is affected by the processing conditions resulting in appearance variations of the final product. A set of aluminum-flake pigmented coatings having different flake orientations was pre-pared using