Journal article
Relaxation properties of polyoxymethylene and ethylene-octene copolymer blend in solid and melt states
Publication Details
Authors: | Grigalovica, A.; Bartule, M.; Zicans, J.; Meri, R.; Heim, H.; Berger, C. |
Publisher: | ESTONIAN ACADEMY PUBLISHERS |
Publication year: | 2012 |
Journal: | Proceedings of the Estonian Academy of Sciences |
Pages range : | 200-206 |
Volume number: | 61 |
Issue number: | 3 |
Start page: | 200 |
End page: | 206 |
Number of pages: | 7 |
ISSN: | 1736-6046 |
eISSN: | 1736-7530 |
DOI-Link der Erstveröffentlichung: |
Abstract
Rheological properties of polyoxymethylene (POM) and ethylene-octene copolymer (EOC) in solid and melt states were investigated. Blends were prepared with a twin screw extruder at broad component wt-to-wt ratios (10, 30, 50, 70, 90 wt% of EOC). The morphology as well as calorimetric, rheological, and elastic properties of the blends were studied. The investigation showed that POM/EOC blends were heterogeneous in nature and had a broad phase transition region between 30 and 70 wt% of POM. Because during processing droplet breakup is enhanced for EOC-rich systems, respective blends show "better" morphology with smaller particle sizes. It was, however, observed that rheological and dynamic characteristics (such as storage E' and loss E '' modules as well as shear elastic G' and viscous G '' modules) were highly influenced by intrinsic incompatibility of POM and EOC. Besides, also the crystallization specifics of the investigated blends influenced their E' and E ''.
Rheological properties of polyoxymethylene (POM) and ethylene-octene copolymer (EOC) in solid and melt states were investigated. Blends were prepared with a twin screw extruder at broad component wt-to-wt ratios (10, 30, 50, 70, 90 wt% of EOC). The morphology as well as calorimetric, rheological, and elastic properties of the blends were studied. The investigation showed that POM/EOC blends were heterogeneous in nature and had a broad phase transition region between 30 and 70 wt% of POM. Because during processing droplet breakup is enhanced for EOC-rich systems, respective blends show "better" morphology with smaller particle sizes. It was, however, observed that rheological and dynamic characteristics (such as storage E' and loss E '' modules as well as shear elastic G' and viscous G '' modules) were highly influenced by intrinsic incompatibility of POM and EOC. Besides, also the crystallization specifics of the investigated blends influenced their E' and E ''.
Keywords
blends, dynamic properties, ethylene-octene copolymer, polyoxymethylene, rheological properties
