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
| Original language | English |
|---|---|
| Title of host publication | TAPPI PLACE Conference |
| Publisher | Technical Assoc. of the Pulp and Paper Industry Press |
| Pages | 77-92 |
| ISBN (Print) | 1595100628 |
| Publication status | Published - 2004 |
| Event | 2004 TAPPI PLACE - Polymers, Laminations, Adhesives, Coatings, and Extrusions Division Conference - Indianapolis, IN, United States Duration: 2004 Aug 29 → 2004 Sept 2 |
Conference
| Conference | 2004 TAPPI PLACE - Polymers, Laminations, Adhesives, Coatings, and Extrusions Division Conference |
|---|---|
| Country/Territory | United States |
| City | Indianapolis, IN |
| Period | 2004/08/29 → 2004/09/02 |
Bibliographical note
The information about affiliations in this record was updated in December 2015.The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
Subject classification (UKÄ)
- Chemical Sciences
Free keywords
- Rheometry
- Oxygen concentrations
- Surface oxidation
- Film extraction