“… Figure 1 Summary of various developments in understanding glassy polymer properties and performance [19 -27]. References for Cherry's articles with co-workers are Cherry and Mayne [28–30], Cherry and Holmes [31] Cherry et al [32], Cherry and Thomson [33–36], Fotheringham and Cherry [37–39], Barton and Cherry [40], Cherry and Hin [41,42], Hin and Cherry [43], Cherry and Yue [44], Cherry and Evely [45], Teoh et al [46], Hill et al [47], and the reference for his book is Cherry [1]. …”
Section: Resultsmentioning
confidence: 99%
“…His work with Barton in 1979 [40] extended his earlier work on predicting tensile and compressive yield strength [37][38][39] to predicting creep-rupture lifetime for polymers using a modified Eyring model. His subsequent work with Teoh [41,43,46] examined the energy criterion of failure [86] as applied to creep rupture. The limit to stored energy in a polymer is a material property described by its cohesive energy density (CED), defined as the polymer's internal energy per volume and equal to the square of the polymer's solubility parameter.…”
Section: Internal Energy and Segment To Segment Non-bonded Interactio...mentioning
Glassy polymer coatings on metal substrates rely on their mechanical, physical, and transport properties for corrosion protection. These properties are influenced by free volume between polymer chains that plays a critical role in coating performance. Free volume permits local segmental mobility that affects mechanical properties, such as yield and adhesion, and also permits diffusion of small molecules (water, ions, and oxygen) through the coating to the substrate. Fractional free volume is calculated from the specific volume and Bondi group contribution theory for the occupied volume. Free volume distribution (free volume element size and number) is measured by positron annihilation lifetime spectroscopy (PALS) using the ortho-positronium (oPs) probe, which detects free volume elements in glassy polymer coatings. The oPs probe is sensitive to phenomena that affect both the mechanical and barrier properties of coatings including physical ageing, water sorption, and plasticisation, making PALS a suitable allied testing method for corrosion-protective coatings.
“… Figure 1 Summary of various developments in understanding glassy polymer properties and performance [19 -27]. References for Cherry's articles with co-workers are Cherry and Mayne [28–30], Cherry and Holmes [31] Cherry et al [32], Cherry and Thomson [33–36], Fotheringham and Cherry [37–39], Barton and Cherry [40], Cherry and Hin [41,42], Hin and Cherry [43], Cherry and Yue [44], Cherry and Evely [45], Teoh et al [46], Hill et al [47], and the reference for his book is Cherry [1]. …”
Section: Resultsmentioning
confidence: 99%
“…His work with Barton in 1979 [40] extended his earlier work on predicting tensile and compressive yield strength [37][38][39] to predicting creep-rupture lifetime for polymers using a modified Eyring model. His subsequent work with Teoh [41,43,46] examined the energy criterion of failure [86] as applied to creep rupture. The limit to stored energy in a polymer is a material property described by its cohesive energy density (CED), defined as the polymer's internal energy per volume and equal to the square of the polymer's solubility parameter.…”
Section: Internal Energy and Segment To Segment Non-bonded Interactio...mentioning
Glassy polymer coatings on metal substrates rely on their mechanical, physical, and transport properties for corrosion protection. These properties are influenced by free volume between polymer chains that plays a critical role in coating performance. Free volume permits local segmental mobility that affects mechanical properties, such as yield and adhesion, and also permits diffusion of small molecules (water, ions, and oxygen) through the coating to the substrate. Fractional free volume is calculated from the specific volume and Bondi group contribution theory for the occupied volume. Free volume distribution (free volume element size and number) is measured by positron annihilation lifetime spectroscopy (PALS) using the ortho-positronium (oPs) probe, which detects free volume elements in glassy polymer coatings. The oPs probe is sensitive to phenomena that affect both the mechanical and barrier properties of coatings including physical ageing, water sorption, and plasticisation, making PALS a suitable allied testing method for corrosion-protective coatings.
“…6 In a stress relaxation experiment, the total applied strain is held at a constant level, and so: 6 In a stress relaxation experiment, the total applied strain is held at a constant level, and so:…”
SYNOPSISIf a three-element mechanical model incorporating a stress-dependent thermally activated rate process is used to predict the instantaneous and anelastic components of elastic modulus of high density polyethylene, it is suggested that the measured elastic modulus determines the anelastic response rather than an instantaneous response and, furthermore, it is related to an interlamellar shear rather than a slip process in the crystalline region. 0 1996 John Wiley & Sons, Inc.
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