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Author: li piin sung

Displaying records 31 to 40 of 60 records.
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31. Relating Gloss Loss to Topographical Features of a PVDF Coating
Published: 10/6/2004
Authors: J Faucheu, Li Piin Sung, K Wood, Jonathan W. (Jonathan W.) Martin
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860584

32. Measurement Approaches to Develop a Fundamental Understanding of Scratch and Mar Resistance
Published: 10/1/2004
Authors: Mark R VanLandingham, N-K Chang, T-Y Wu, Li Piin Sung, V D Jardret, S-H Chang
Abstract: Instrumented indentation and confocal microscopy were used to characterize the surface mechanical response of polymeric materials. Viscoelastic behavior was measured using instrumented indentation. A model based on contact between a rigid probe and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860527

33. USE OF LASER SCANNING CONFOCAL MICROSCOPY FOR QUANTITATIVE CHARACTERIZATION OF PHYSICAL CHANGES OF POLYMER COATINGS AFTER UV EXPOSURE
Published: 10/1/2004
Authors: Li Piin Sung, J Jasmin, Xiaohong Gu, Tinh Nguyen, Jonathan W. (Jonathan W.) Martin
Abstract: Due to its non-destructive properties, laser scanning confocal microscopy (LSCM) has become a powerful tool for monitoring physical changes in polymeric coatings following ultraviolet (UV) radiation exposure. Physical changes caused by UV exposure i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860531

34. Effect of Microstructure of Fluorinated Acrylic Coatings on UV Degradation Testing
Published: 9/1/2004
Authors: Li Piin Sung, Silvia Vicini, D L Ho, L Hedli, C Olmstead, Kurt Wood
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860597

35. Advanced Techniques for Nanocharacterization of Polymeric Coating Surfaces
Published: 7/1/2004
Authors: Xiaohong Gu, Tinh Nguyen, Li Piin Sung, Mark R VanLandingham, Y C Jean, Jonathan W. (Jonathan W.) Martin
Abstract: 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 d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860520

36. Finite-Size Effects on Surface Segregation in Polymer Blend Films Above and Below the Critical Point of Phase Separation
Published: 3/1/2004
Authors: H Grull, Li Piin Sung, Alamgir Karim, Jack F Douglas, Sushil K Satija, Makoto Hayashi, H Jinnai, TT Hashimoto, Charles C. Dr. Han
Abstract: 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 enri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852233

37. Advanced Techniques for Nanocharacterization of Polymeric Coating Surfaces
Published: 1/1/2004
Authors: X H Gu, T Y Wu, Tinh Nguyen, Li Piin Sung, Mark R VanLandingham, Michael J Fasolka, Jonathan W. (Jonathan W.) Martin, Y C Jean, D Nguyen, N K Chang
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853954

38. Suppression of Phase Separation Pattern Formation in Blend Films With Block Copolymer Compatibilizer
Published: 7/1/2003
Authors: Li Piin Sung, Jack F Douglas, Charles C. Dr. Han, Alamgir Karim
Abstract: We show that the addition of a small concentration of a block copolymer surfactant to a thin phase separating blend film can suppress the pattern formation that occurs in the blend films without block copolymer. This effect is observed even at very ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852060

39. Suppression of Surface Pattern Formation in Blend Films With Block Copolymer Surfactant
Published: 7/1/2003
Authors: Li Piin Sung, Jack F Douglas, Charles C. Dr. Han, Alamgir Karim
Abstract: We show that the addition of a small concentration of a block copolymer surfactant to a thin phase separating blend film can supppress the pattern formation that occurs in the blend films without block copolymer. This effect is obseved even at very ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851867

40. Surface and Interface Properties of UV-Exposed PVDF/PMMA-CO-PEA Blends
Published: 3/5/2003
Authors: Xiaohong Gu, Li Piin Sung, D L Ho, Chris A Michaels, D Nguyen, Y C Jean, Tinh Nguyen
Abstract: 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 approx ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860474



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