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  • 1
    facet.materialart.
    Unknown
    Physical aging of linear and network epoxy resins (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Network and linear epoxy resins principally based on the diglycidyl ether of bisphenol-A and its oligomers are prepared and studied using diamine and anhydride crosslinking agents. Rubber modified epoxies and a carbon fiber reinforced composite are also investigated. All materials display time-dependent changes when stored at temperatures below the glass transition temperature after quenching (sub-T/g/ annealing). Solvent sorption experiments initiated after different sub-T(g) annealing times demonstrate that the rate of solvent uptake can be indirectly related to the free volume of the epoxy resins. Residual thermal stresses and water are found to have little effect on the physical aging process, which affects the sub-T(g) properties of uniaxial carbon fiber reinforced epoxy material. Finally, the importance of the recovery phenomenon which affects the durability of epoxy glasses is considered.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    An overview of the nonequilibrium behavior of polymer glasses (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: It is pointed out that research efforts are at present being directed in two areas, one comprising experimental studies of this phenomenon in various glassy polymer systems and the other involving the development of a quantitative theory capable of satisfactorily predicting aging behavior for a variety of polymer materials under different conditions. Recent work in both these areas is surveyed. The basic principles of nonequilibrium behavior are outlined, with emphasis placed on changes in material properties with annealing below the glass transition temperature. Free volume theory and thermodynamic theory are discussed.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
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