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Rheological and thermorheological assessment of polyethylene in multiple extrusion process
Rheological and thermorheological assessment of polyethylene in multiple extrusion process
- Source :
- Thermochimica Acta. 668:19-27
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The relationship between rheological properties and structural changes in polyethylene chains due to the recycling of two linear low-density polyethylenes (LL-A and LL-B) has been investigated. These samples were subjected to multiple extrusion processes (9 extrusion steps). According to the results of gel content experiments, crosslinking did not occur. The results of the gel permeation chromatography indicated that the chain scission was slightly predominant during the re-extrusion, while the rheometry results clearly show the effects of long-chain branching during degradation. Therefore, the degradation proceeded through both paths. Based on the rheological results and the Cole-Cole method, LL-B exhibited a higher degradation rate during the extrusion process (because of the low antioxidant content), compared to LL-A. The results of thermorheological methods including van-Gurp-Palmen and activation energy spectra indicated that the extent of thermorheological complexity was intensified with increasing the number of extrusion cycles and consequently increasing the number of long-chain branches.
- Subjects :
- Materials science
Rheometry
Chain scission
02 engineering and technology
Activation energy
Polyethylene
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Branching (polymer chemistry)
01 natural sciences
0104 chemical sciences
Gel permeation chromatography
chemistry.chemical_compound
chemistry
Rheology
Chemical engineering
Extrusion
Physical and Theoretical Chemistry
0210 nano-technology
Instrumentation
Subjects
Details
- ISSN :
- 00406031
- Volume :
- 668
- Database :
- OpenAIRE
- Journal :
- Thermochimica Acta
- Accession number :
- edsair.doi...........bf532f6bb2c117ef64e5ea90383a5579
- Full Text :
- https://doi.org/10.1016/j.tca.2018.08.010