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Search Publications by: Joannie Chin (Fed)

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Displaying 26 - 50 of 61

Long-Term Performance of Nano-Filled Polymeric Materials: Effect of ZnO Nanoparticles on Photodegradation of a Waterborne Polyurethane Coating

July 8, 2009
Author(s)
Xiaohong Gu, Dongmei Zhe, Minhua Zhao, Guodong Chen, Nhieu Ly, Paul E. Stutzman, Li Piin Sung, Tinh 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

Finite Element Modeling of Hybrid Polymer Composite Beams

October 16, 2008
Author(s)
Hai C. Tang, Tze J. Chuang, Tinh Nguyen, Joannie W. Chin, Hanchang F. Wu
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 and are

Role of Interfacial Water in the Adhesion Loss of Polymer/Substrate Systems and Composites

June 21, 2007
Author(s)
Tinh Nguyen, Joannie W. Chin, E Byrd, David Alshed, Cyril Clerici, Jonathan W. Martin
Water at the polymer/substrate interface in coatings, adhesives, and fiber-reinforced polymer composites is often the main cause of adhesion loss in these systems. Using experimental data measured in this study, we critically assess the role of interfacial

Aging Effects on the Dynamic Tensile Response of Zylon Fibers

June 4, 2007
Author(s)
Richard L. Rhorer, Joannie W. Chin, Amanda L. Forster, Weinong W. Chen, Bo Song, Xu Nie
This paper reports on dynamic tests of fibers used in soft body armor. The type of fiber tested is poly(p-phenylene-2,6- benzobisoxaxole) (PBO), or brand name Zylon. Aged fibers were tested using a modified split Hopkinson pressure bar that loads the

Chemical and Physical Characterization of Poly(p-phenylene-2,6-benzobisoxazole) Fibers Used in Body Armor: Temperature and Humidity Aging

November 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Cyril Clerici, Amanda L. Forster, M Oudina, Li Piin Sung, Kirk D. Rice
In recent years, poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers have become prominent in high strength applications such as body armor, ropes and cables, and recreational equipment. The objectives of this study were to expose woven PBO body armor

Chemical and Physical Characterization of Poly(p-phenylene benzobisoxazole) Fibers Used in Body Armor

May 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Amanda L. Forster, Xiaohong Gu, Tinh Nguyen, Kirk D. Rice, Walter J. Rossiter Jr, S J. Scierka, John R. Sieber, Paul E. Stutzman, Li Piin Sung
Problems with the performance and durability of body armor based on poly(p-phenylene benzobisoxazole (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that was less than 8 months was penetrated by a bullet. Mechanical testing of

Validation of the Receprocity Law for Coating Photodegradation

October 20, 2004
Author(s)
Joannie W. Chin, Tinh Nguyen, Jonathan W. Martin, E Byrd
Accelerating the photodegradation of commerical polymeric materials has great practical importance in the weathering community. However, questions exist as to whether high radiant flux exposure results cn be extrapolated to in-service exposure levels

A Photoconductivity Technique for the Assessment of Pigment Reactivity

November 19, 2003
Author(s)
Joannie W. Chin, S J. Scierka, T Kim, Amanda L. Forster
Large volumes of titanium dioxide (TiO2) are utilized each year in coatings, sealants, plastics and paper for opacification and pigmentation purposes. It is well known that the photoreactivity of TiO2 can contribute to the degradation of the material that

Accelerated UV Weathering Device Based on Integrating Sphere Technology

November 1, 2003
Author(s)
Joannie W. Chin, E Byrd, E Embree, Jason D. Garver, B Dickens, T Finn, Jonathan W. Martin
An accelerated ultraviolet (UV) weathering device based on integrating sphere technology has been designed, fabricated, and implemented in weathering studies of polymers. This device has the capability of irradiating multiple speciments with exptremely

Reciprocity Law Experiments in Polymeric Photodegradation: A Critical Review

September 1, 2003
Author(s)
Jonathan W. Martin, Joannie W. Chin, Tinh Nguyen
celerating the photodegradation of polymeric materials is of great interest in weathering research. One way of achieving acceleration is by exposing polymeric materials to a high radiant flux, but questions have arisen as to whether high radiant flux