Nonlinear Variable Temperature Creep of Low‐Density Polyethylene

Mark, R.; Findley, W. N.

doi:10.1122/1.549505

Cited by 5 publications

(3 citation statements)

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“…4). The same procedure has been extensively used by many authors who disregard the applicability of the shift factor to other viscoelastic properties 8–11, 19, 20. The master curve generated in this way is presented in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

“…However, the results of this study, too, must be used with caution because creep behavior is a complex phenomenon that is dependent on a variety of parameters, such as the stress level, temperature, and environmental conditions. In concurrence with the results of previous researchers8, 9, 12, 15 for semicrystalline polymers, an Arrhenius equation better explains the temperature dependence of the shift factors than the WLF equation for the kenaf‐fiber/HDPE composite of this study. E in the Arrhenius equation [eq.…”

Section: Resultsmentioning

confidence: 99%

“…A plot of log a T against the reciprocal of the absolute temperature gave a straight line, indicating an Arrhenius relationship. On the other hand, Mark and Findley9 reported a successful nonlinear creep master curve obtained by only horizontal shifting for low‐density polyethylene. Again, a nearly linear relationship between the shift factors and temperature was reported, and this indicated an Arrhenius relationship.…”

Section: Introductionmentioning

confidence: 99%

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Time–temperature superposition principle applied to a kenaf‐fiber/high‐density polyethylene composite

Tajvidi

Falk

Hermanson

2005

J of Applied Polymer Sci

122

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ABSTRACT:The time-temperature superposition principle was applied to the viscoelastic properties of a kenaffiber/high-density polyethylene (HDPE) composite, and its validity was tested. With a composite of 50% kenaf fibers, 48% HDPE, and 2% compatibilizer, frequency scans from a dynamic mechanical analyzer were performed in the range of 0.1-10 Hz at five different temperatures. Twelve-minute creep tests were also performed at the same temperatures. Creep data were modeled with a simple two-parameter power-law model. Frequency isotherms were shifted horizontally and vertically along the frequency axis, and master curves were constructed. The resulting master curves were compared with an extrapolated creep model and a 24-h creep test. The results indicated that the composite material was thermorheologically complex, and a single horizontal shift was not adequate to predict the long-term performance of the material. This information will be useful for the eventual development of an engineering methodology for creep necessary for the design of structural building products from these composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Time–temperature superposition principle applied to a kenaf‐fiber/high‐density polyethylene composite

Tajvidi

Falk

Hermanson

2005

J of Applied Polymer Sci

122

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Effect of mold temperature on the long‐term viscoelastic behavior of polybutylene terepthalate

Banik

Mennig

2008

Polymer Engineering & Sci

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The effect of mold temperature variation during injection molding on the long‐term viscoelastic behavior of polybutylene terepthalate (PBT) was studied by dynamic mechanical thermal analysis (DMTA) and flexural creep tests. The time–temperature superposition (TTS) principle was applied to the experimental data and the master curves were created to predict their long‐term behavior. The WLF and Arrhenius models were verified for the shift data in the investigating temperature range and the activation energies for the deformation process were calculated based on the Arrhenius equation. Further a four‐element Burger model was applied to the creep results to represent the creep behavior of the PBT processed at two different mold temperatures and to better understand the deformation mechanism. Differential scanning calorimetry (DSC) and density measurements were accomplished to characterize the process‐dependent microstructures. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

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