16‐Year creep of polyethylene and PVC
1974; Wiley; Volume: 14; Issue: 8 Linguagem: Inglês
10.1002/pen.760140807
ISSN1548-2634
AutoresWilliam N. Findley, Joseph Francis Tracy,
Tópico(s)Polymer crystallization and properties
ResumoAbstract Creep tests at constant values of tensile stress, temperature, and relative humidity for two thermoplastics were conducted for approximately 132,000 hr. The strains, ϵ, for the first 2000 hr of time, t , were described by an equation of the form ϵ = ϵ o + ϵ + t n where all other symbols are constants. This equation was found to predict the creep of poly(vinyl chloride) for approximately 132,000 hr with reasonable accuracy. The predicted strains for polyethylene (density 0.924) were somewhat low. Strains during unloading and reloading after 90,000 hr of creep were predicted reasonably well by the Boltzmann superposition principle.
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