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Displaying 801 - 825 of 925

Application of the V-Notch Shear Test as Applied to Unidirectional Hybrid Composites

January 1, 2003

Author(s)

H Jianmei, Martin Chiang, Donald L. Hunston

The modified Wyoming test fixture (ASTM D5379-93) with doubly v-notched specimens was investigated as a mean for determining the in-plane shear modulus and strength of unidirectional hybrid composites. Two types of hybrid systems having different fiber-tow

Chemistry of Silanes Interfaces in Dental Polymers and Composites

January 1, 2003

Author(s)

Joseph M. Antonucci, Sabine H. Dickens, Bruce O. Fowler, H H. Xu, Walter G. McDonough

The performance and service life of glass- or ceramic-filled polymeric composites depend on the nature of their resin, filler and interfacial phases as well as the efficacy of the polymerization process. The synergy that exists between the organic polymer

Effect of Acidic Comonomers on Methacrylate Conversion and Mechancial Strength of Bioreactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, D W. Liu, Drago Skrtic

Effect of Acidic Comonomers on Methacrylate Conversion and Mechanical Strength of Bioactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, Da-Wei Liu, Drago Skrtic

Prior research utilizing a monomer system consisting of the dental monomers Bis-GMA and TEGDMA at equal masse levels with neutral, hydrophilic monomers indicated that, generally, the ternary monomer enhanced the degree of methacrylate conversion (DC) but

Glass-Fiber/Resin Interfacial Strength the Microbond Test and Chemical Evaluation

January 1, 2003

Author(s)

Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers, Gary E. Schumacher

The quest for durable, aesthetic and bondable materials that can restore both the function and appearance of lost tooth structure has been a major concern for dental materials researchers. A significant advance, which ushered in the modern era of

Interaction between Matrix Cracks in E-Glass/Epoxy Two-Dimensional Multi-Fiber-Array Model Composites

January 1, 2003

Author(s)

Gale A. Holmes, Walter G. McDonough, Joy Dunkers, Charles C. Han

Application of the V-Notch Shear Testing for Unidirectional Hybrid Composities

December 1, 2002

Author(s)

J He, Martin Y. Chiang, Donald L. Hunston, Charles C. Han

The v-notch (losipescu) shear test was investigated as a mean for determining the in-plane shear modulus and strength of unidirectional hybrid composites. Two types of hybrid systems having different fiber tow volume fractions composed of carbon and glass

The Effects of Local Inhomogeneity on Shear Property Measurements of Hybrid Composites

November 1, 2002

Author(s)

Martin Chiang, Carl R. Schultesiz, J He

Numerous biological and chemical studies involve the use of calcium hydroxyapatite Ca10(PO4)6(OH)2, HA. In this study detailed physicochemical characterization of hexagonal HA prepared from an aqueous solution was carried out employing different methods

An Analysis of the Fiber-Fiber Interactions Using the Fragmentation Test and Optical Coherence Tomography

October 1, 2002

Author(s)

Walter G. McDonough, Gale A. Holmes, Joy P. Dunkers

Multi-fiber model composites are being used to conduct fundamental studies into the nucleation of failure in fibrous composites. Current results have revealed that the nucleation of critical flaws in unidirectional fibrous composites may rely on the time

Application of Self-Assembled Technology to Probe Fiber Matrix-Adhesion

October 1, 2002

Author(s)

E Feresenbet, D T. Raghavan, Gale A. Holmes

Adhesion at the fiber-matrix interface of composite is often related to a combination of factors such as mechanical interlocking, physico-chemical interactions, and chemical bonding of the fiber-matrix interphase region. We demonstrate the use of (self

Viscoelastic Characterization of Sealant Materials

September 18, 2002

Author(s)

Donald L. Hunston, Christopher C. White

Polymeric sealants are an important example of a major consumer product where the performance depends critically on rheological properties. The work here developed a testing and modeling procedure to characterize the basic mechanical properties of sealant

Rheology of Poly(ethylene oxide) Clay Solutions

August 1, 2002

Author(s)

Sheng Lin-Gibson, G Schmidt, Jai A. Pathak, Charles C. Han

Poly(ethylene oxide) and Laponite, a synthetic hectorite clay, form highly viscoelastic solutions in water. Above a certain clay concentration, these solutions can be described as physical crosslinked networks where clay platelets undergo equilibrium

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

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