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Author: tinh nguyen

Displaying records 81 to 90 of 114 records.
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81. Characterization of Polyester Degradation Using Tapping Mode Atomic Force Microscopy; 1. Exposure in Alkaline at Room Temperature
Published: 1/1/2001
Authors: Xiaohong Gu, D T Raghavan, Tinh Nguyen, Mark R VanLandingham, D Yebassa
Abstract: One of the major disadvantages of polyester materials is their sensitivity to hydrolysis. In this paper, tapping mode atomic force microscopy (AFM) has been used to examine the microstructure of polyester films before and after exposure to an alkali ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860313

82. Characterization of Heterogeneous Regions in Polymer Systems Using Tapping Mode and Force Mode Atomic Force Microscopy
Published: 11/1/2000
Authors: R Raghavan, Mark R VanLandingham, Xiaohong Gu, Tinh Nguyen
Abstract: Characterization of polymer coating surfaces is crucial to understanding and predicting the long-term performance of coatings in aggressive environments. The exposed polymer surface and near-surface regions can differ from the bulk polymer film both ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860238

83. Characterization of Polyester Degradation Using Tapping Mode Atomic Force Microscopy
Published: 8/1/2000
Authors: Xiaohong Gu, D T Raghavan, Tinh Nguyen, Mark R VanLandingham
Abstract: Tapping mode AFM was used to examine the microstructure of polyester films before and after exposure to an alkaline solution. Bright-colored microgel domains and dark-colored interstitial regions were observed in phase images of the unexposed sample ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860277

84. Effects of Relative Humidity on Photodegradation of Acrylic Melamine Coatings: A Quantitative Study
Published: 8/1/2000
Authors: Tinh Nguyen, Jonathan W. Martin, E Byrd, N Embree
Abstract: Service life prediction methodology based on correlating short-term performance with outdoor data is not a fundamentally sound approach because the weather never duplicates itself. Experiments having over 200 different combinations of exposure condit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860279

85. Mapping Chemically Heterogeneous Polymer System Using Chemical Modification and Atomic Force Microscopy
Published: 8/1/2000
Authors: D T Raghavan, Tinh Nguyen, Mark R VanLandingham, Xiaohong Gu
Abstract: Polymer coatings are heterogeneous and often contain nanoscale degradation -susceptible regions. Therefore, mapping and identification of these regions would provide essential information for understanding the mechanism of the degradation of polymeri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860235

86. Temperature Effects on Fatigue of Polymer Composites
Published: 7/1/2000
Authors: Hai C. Tang, Tinh Nguyen, Tze J Chuang, Joannie W Chin, Hanchang F Wu, J Lesko
Abstract: Fiber-reinforced polymeric composites provide lightweight, high strength, and corrosive resistance to severe environmental exposures. These composites have been extensively used in aerospace and military application over the last three decades an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151463

87. Fatigue Model for Fiber-Reinforced Polymeric Composites in Civil Engineering Applications
Published: 5/1/2000
Authors: Hai C. Tang, Tinh Nguyen, Joannie W Chin, J Lesko, Tze J Chuang
Abstract: A fatigue model based on cumulative damage is developed for predicting the fatigue life of fiber-reinforced polymeric composites in offshore applications. This model incorporates applied maximum stress, stress amplitude, loading frequency, residual ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151356

88. Mapping Polymer Heterogeneity Using Atomic Force Microscopy Phase Imaging and Nanoscale Indentation
Published: 4/1/2000
Authors: D T Raghavan, Xiaohong Gu, Tinh Nguyen, Mark R VanLandingham, Alamgir Karim
Abstract: Polymer coatings contain degradation-susceptible regions, and corrosion of metallic substrate can occur directly underneath these regions. In this paper, the microstructure of model coating materials is investigated using atomic force microscopy (AFM ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860198

89. Estimation of Absorbed Photolytic Dosage and Quantum Yields Using UV-Vis and FTIR spectroscopies
Published: 3/1/2000
Authors: Jonathan W. Martin, Tinh Nguyen, E Byrd, N Embree
Abstract: An effective dosage model has been introduced for predicting the service life of polymeric materials exposed to UV light. The effective dosage model, which relates material damage through the apparent quantum yield, has a firm basis in the priciples ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860234

90. C-30 Self-Assembled Monolayers on Silica, Titania, and Zirconia: Hplc Performance, Atomic Force Microscopy, Ellipsometry, and Nmr Studies of Molecular Dynamics and Uniformity of Coverage
Published: 1/1/2000
Authors: M. Pursch, David Lloyd VanderHart, L C Sander, X H Gu, Tinh Nguyen, Stephen A Wise, Donald A. Gajewski
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853674



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