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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 12, Number 5
BKCSDE 12(5)
May 20, 1991

Title	Solvent Effect on Stress Relaxation of PET Filament Fibers and Self Diffusion of Crystallites
Author	Nam Jeong Kim, Eung Ryul Kim, Sang Joon Hahn*
Keywords
Abstract	Viscoelastic properties of PET filament fibers on stress relaxation were investigated in the solvents of H2O, 0.05% NaOH and 50% DMF using an Instron (UTM4-100 Tensilon) with solvent chamber. The theoretical stress relaxation equation derived by applying the Ree-Eyring's hyperbolic sine law to dashpot of three element non-Newtonian model was applied to the experimental stress relaxation curves, and the model parameters G1, G2, α and β were obtained. By analyzing temperature dependency of the relaxation time, the values of activation entropy, activation enthalpy and activation free energy for flow in PET filament fiber were evaluated, the activation free energy being about 25.7 kcal/mol. The self diffusion coefficient and hole distance were obtained from parameters α, β and crystallite size in order to study the self diffusion and the orientation of crystallites in amorphous region and the effect of solvent.
Page	468 - 473
Full Text	PDF

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