Abstract
Cross-linked polymers have particular rheological responses during reprocessing, e. g. if the material is recycled, special processing conditions are required. Other virgin polymers can be used as a blending component to enhance rheological properties.
Bi-layer film of EVA/LLDPE was produced on a blown film line and cross-linked by high-energy radiation. This film was ‘agglomerated’ then reprocessed in a twin-screw extruder with virgin LLDPE and blown into film. The miscibility of the blend components was then studied using a TA Instruments temperature modulated differential scanning calorimeter (TMDSC).
It was found that the cross-linked EVA/LLDPE scrap and the LLDPE have a slight miscibility in the liquid state. A bigger portion of LLDPE was miscible (dissolved) in EVA in low LLDPE blends. A positive deviation in the heat capacity of the LLDPE component compared to the additivity rule indicated melting to be more reversible in the first heating cycle. This initial miscibility was attributed to being induced by high shear during processing. A smaller positive deviation also occurred in the second heating cycle. This was attributed to intrinsic miscibility.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
B. Schneier, Crosslinked Thermoplastics, in Handbook of Thermoset Plastics, 2nd. Ed. Noyes Pub. Westwood, N. Y. 1998, p. 498.
P. J. Flory, Principles of Polymer Chemistry, N. Y. 1953.
R. M. Patel, P. Saavedra, J. deGroot, C. Hinton and R. Guerra, Antec’97, II Hanser, N. Y. (1997).
L. A. Utracki, Polymer Alloys and Blends: Thermodynamics and Rheology, 1990.
L. An, A. Hinrichs, R. Horst, C. Krause and B. A. Wolf, Macromolecular Symposia, 149 (2000) 75.
M. L. Fernandez and J. S. Higgins, Macromolecular Symposia, 98 (1995) 985.
I. A. Hindawi, J. S. Higgins and R. A. Weiss, Polymer, 33 (1992) 2522.
H. W. Kammer, C. Kummerloewe, J. Kressler and J. P. Melior, Polymer, 32 (1991) 1488.
H. Takahashi, T. Matsuoka, T. Ohta, K. Fukumori, T. Kurauchi and O. Kamigaito, J. of Applied Polymer Sci., 36 (1988) 1821.
M. G. Sittel-Faraj, F. Cser, M. Jollands and S. Bhattacharya: ANTEC’01, (2001) 2718.
ASTM D2765 (1990).
F. Cser, F. Rasoul and E. Kosior, J. Therm. Anal. Cal., 50 (1997) 727.
L. H. Sperling, Interpenetrating Polymer Networks: An Overview, in Interpenetrating Polymer Networks, 1994, p. 3.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Cser, F., Jollands, M., White, P. et al. Miscibility Studies on cross-linked EVA/LLDPE Blends by TMDSC. Journal of Thermal Analysis and Calorimetry 70, 651–662 (2002). https://doi.org/10.1023/A:1021661515647
Issue Date:
DOI: https://doi.org/10.1023/A:1021661515647