Stress dependence of water diffusion in epoxy resin

Fahmy, A. A.; Hurt, J. C.

doi:10.1002/pc.750010205

Cited by 84 publications

(50 citation statements)

References 8 publications

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“…(29) In a bent epoxy bar, more water is picked up at the tension side than at the compression side because the diffusivity of water is increased at the tension side. In theory, the diffusion constant should increase exponentially with stress; howevr §O) the water uptake through sorption does not follow the same pattern.…”

Section: Stress and Interfacementioning

confidence: 99%

Adhesives, Sealants, and Coatings for Space and Harsh Environments

Lee

1988

Adhesives, Sealants, and Coatings for Space and Harsh Environments

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Section: Stress and Interfacementioning

confidence: 99%

Adhesives, Sealants, and Coatings for Space and Harsh Environments

Lee

1988

Adhesives, Sealants, and Coatings for Space and Harsh Environments

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“…Stress assisted diffusion in polymers was observed by Fahmy and Hurt (1980) who used a four-point bend specimen to study the effect of bending stress on diffusion in a polymer. They observed that more water uptake occurred on the tensile side than on the compressive side for NARMCO 5208 Epoxy.…”

Section: Introductionmentioning

confidence: 99%

Characterization and modeling of strain assisted diffusion in an epoxy adhesive layer

Roy

Vengadassalam

Wang

et al. 2006

International Journal of Solids and Structures

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In this paper a coupled model for strain-assisted diffusion is derived from the basic principles of continuum mechanics and thermodynamics, and material properties characterized using diffusion experiments. The proposed methodology constitutes a significant step toward modeling the synergistic bond degradation mechanism at the bonded interface between a Fiber Reinforced Polymer (FRP) and a substrate, and for predicting debond initiation and propagation along the interface in the presence of a diffusing penetrant at the crack tip and at elevated temperatures. It is now well-known that FickÕs law is frequently inadequate for describing moisture diffusion in polymers and polymer composites. Non-Fickian or anomalous diffusion is likely to occur when a polymer is subjected to external stresses and strains, as well as elevated temperatures and humidity. In this paper, a modeling methodology based on the basic principles of continuum mechanics and thermodynamics is developed which allows characterization of the combined effects of temperature, humidity, and strain on diffusion coefficients as well as on moisture saturation level, from moisture weight gain data. For tractability, the diffusion governing equations are simplified for the special case of 1-D diffusion subjected to uniaxial strain and a uniform strain gradient. A novel test specimen that introduces a uniform strain gradient is developed, and diffusion test data for an epoxy-based primer/adhesive are presented and employed for complete characterization of material constants used in the model.

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“…Water sorption is also expedited in the presence of functional stresses [14]. By controlling the degree of hydrolysis and pH, QAMS-3 PH may be blended with methacrylate resin monomers to produce advanced copolymer blends with self-repair potential.…”

Section: Introductionmentioning

confidence: 99%

Quaternary ammonium silane-functionalized, methacrylate resin composition with antimicrobial activities and self-repair potential

et al. 2012

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Design of antimicrobial polymers for enhancing healthcare issues and minimizing environmental problems is an important endeavor with both fundamental and practical implications. Quaternary ammonium silane-functionalized methacrylate (QAMS) represents an example of antimicrobial macromonomers synthesized by a sol-gel chemical route; these compounds possess flexible Si-O-Si bonds. In present work, a partially-hydrolyzed QAMS copolymerized with bis-GMA is introduced. This methacrylate resin was shown to possess desirable mechanical properties with both a high degree of conversion and minimal polymerization shrinkage. Kill-on-contact microbiocidal activities of this resin were demonstrated using single-species biofilms of Streptococcus mutans (ATCC 36558), Actinomyces naeslundii (ATCC 12104) and Candida albicans (ATCC 90028). Improved mechanical properties after hydration provided the proof-of-concept that QAMS-incorporated resin exhibits self-repair potential via water-induced condensation of organic modified silicate (ormosil) phases within the polymerized resin matrix.

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Stress dependence of water diffusion in epoxy resin

Cited by 84 publications

References 8 publications

Adhesives, Sealants, and Coatings for Space and Harsh Environments

Adhesives, Sealants, and Coatings for Space and Harsh Environments

Characterization and modeling of strain assisted diffusion in an epoxy adhesive layer

Quaternary ammonium silane-functionalized, methacrylate resin composition with antimicrobial activities and self-repair potential

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