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Degradation of LDPE LLDPE and HOPE in film extrusion

Andersson, Thorbjörn and Wesslén, Bengt LU (2004) 2004 TAPPI PLACE - Polymers, Laminations, Adhesives, Coatings, and Extrusions Division Conference In TAPPI PLACE Conference p.77-92
Abstract
The degradation of different polyethylenes, LDPE, LLDPE, and HDPE, with and without antioxidants and at different oxygen concentrations in the polymer granulates have been studied in extrusion coating processing. The degradation was followed by On Line Rheometry, Size Exclusion Chromatography, Surface Oxidation Index measurements, and GC-MS Chromatography. The degradations starts in the extruder where primary radicals are formed which are subject the auto oxidation when oxygen is present. In the extruder, cross-linking and chain scission reactions are dominating at low and high melt temperatures, respectively, for LDPE, and chain scission is over all dominating for the more linear LLDPE and HDPE resins. Additives such as antioxidants react... (More)
The degradation of different polyethylenes, LDPE, LLDPE, and HDPE, with and without antioxidants and at different oxygen concentrations in the polymer granulates have been studied in extrusion coating processing. The degradation was followed by On Line Rheometry, Size Exclusion Chromatography, Surface Oxidation Index measurements, and GC-MS Chromatography. The degradations starts in the extruder where primary radicals are formed which are subject the auto oxidation when oxygen is present. In the extruder, cross-linking and chain scission reactions are dominating at low and high melt temperatures, respectively, for LDPE, and chain scission is over all dominating for the more linear LLDPE and HDPE resins. Additives such as antioxidants react with primary radicals formed in the melt. Degradation taking place in the film between the die orifice and the quenching point is mainly related to the exposure time to air-oxygen. Melt temperatures above 280 (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Rheometry, Oxygen concentrations, Surface oxidation, Film extraction
in
TAPPI PLACE Conference
pages
77 - 92
publisher
Technical Assoc. of the Pulp and Paper Industry Press
conference name
2004 TAPPI PLACE - Polymers, Laminations, Adhesives, Coatings, and Extrusions Division Conference
external identifiers
  • Scopus:22144468430
ISBN
1595100628
language
English
LU publication?
yes
id
2d76ab23-b1e6-4be6-bee0-231d73d3ad27 (old id 614991)
date added to LUP
2007-11-27 10:24:44
date last changed
2017-01-01 08:04:39
@inproceedings{2d76ab23-b1e6-4be6-bee0-231d73d3ad27,
  abstract     = {The degradation of different polyethylenes, LDPE, LLDPE, and HDPE, with and without antioxidants and at different oxygen concentrations in the polymer granulates have been studied in extrusion coating processing. The degradation was followed by On Line Rheometry, Size Exclusion Chromatography, Surface Oxidation Index measurements, and GC-MS Chromatography. The degradations starts in the extruder where primary radicals are formed which are subject the auto oxidation when oxygen is present. In the extruder, cross-linking and chain scission reactions are dominating at low and high melt temperatures, respectively, for LDPE, and chain scission is over all dominating for the more linear LLDPE and HDPE resins. Additives such as antioxidants react with primary radicals formed in the melt. Degradation taking place in the film between the die orifice and the quenching point is mainly related to the exposure time to air-oxygen. Melt temperatures above 280},
  author       = {Andersson, Thorbjörn and Wesslén, Bengt},
  booktitle    = {TAPPI PLACE Conference},
  isbn         = {1595100628},
  keyword      = {Rheometry,Oxygen concentrations,Surface oxidation,Film extraction},
  language     = {eng},
  pages        = {77--92},
  publisher    = {Technical Assoc. of the Pulp and Paper Industry Press},
  title        = {Degradation of LDPE LLDPE and HOPE in film extrusion},
  year         = {2004},
}