Sheets of low-density polyethylene (LDPE) were photo-oxidatively treated at room temperature, and subsequently characterized rheologically in the melt state by shear and uniaxial extensional experiments. For photo-oxidation, a xenon lamp was used to irradiate the samples for times between 1 day and 6 weeks. Linear-viscoelastic characterization was performed in a temperature range of 130 to 220°C to obtain the master curve at 170°C, the reference temperature at which the elongational viscosities were measured. Linear viscoelasticity is increasingly affected by increasing photo-oxidation due to crosslinking of LDPE, as corroborated by an increasing gel fraction as determined by a solvent extraction method. The elongational measurements reveal a strong enhancement of strain hardening until a saturation level is achieved. The elongational data are analyzed in the frame work of two constitutive equations, the rubber-like liquid and the molecular stress function models. Within the experimental window, timedeformation separability is confirmed for all samples, independent of the degree of photo-oxidation.
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15 May 2014
PROCEEDINGS OF PPS-29: The 29th International Conference of the Polymer Processing Society - Conference Papers
15–19 July 2013
Nuremberg, Germany
Research Article|
May 15 2014
Elongational viscosity of photo-oxidated LDPE
Víctor H. Rolón-Garrido;
Víctor H. Rolón-Garrido
Chair of Polymer Engineering and Polymer Physics, Berlin Institute of Technology-TU Berlin. Fasanenstr. 90. 10623 Berlin,
Germany
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Manfred H. Wagner
Manfred H. Wagner
Chair of Polymer Engineering and Polymer Physics, Berlin Institute of Technology-TU Berlin. Fasanenstr. 90. 10623 Berlin,
Germany
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AIP Conf. Proc. 1593, 741–745 (2014)
Citation
Víctor H. Rolón-Garrido, Manfred H. Wagner; Elongational viscosity of photo-oxidated LDPE. AIP Conf. Proc. 15 May 2014; 1593 (1): 741–745. https://doi.org/10.1063/1.4873883
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