Influences of unsaturation and metal impurities on the oxidative degradation of high density polyethylene
| Autor: | Alfonso Chirinos-Padron, Norman S. Allen, Michel DePoortere, Emily Chávez, Petra H. Hernández, Constantine Vasiliou |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
chemistry.chemical_classification
Degree of unsaturation Polymers and Plastics Chemistry Organic Chemistry Analytical chemistry General Physics and Astronomy Infrared spectroscopy Polymer Thermogravimetry Differential scanning calorimetry Chemical engineering Impurity Materials Chemistry Degradation (geology) High-density polyethylene |
| Zdroj: | European Polymer Journal. 23:935-940 |
| ISSN: | 0014-3057 |
| DOI: | 10.1016/0014-3057(87)90036-x |
| Popis: | The oxidative degradation of two high density polyethylene (HDPE) samples, differing in unsaturation and metal impurity content, is examined using thermogravimetry (TGA), differential scanning calorimetry (DSC), viscometry and infra-red (i.r.) spectroscopy. The results show that the degree of unsaturation is more important for both thermal and photochemical oxidation, in the solid and in solution. The results also show that the degradation behaviour in solution for these polymers is quite different from very high molecular mass samples in that a simple degradation pattern is not observed. This difference is explained in terms of crosslinking reactions which are more important for the Philips-type polymer than for the Ziegler-type polymer due to the higher degree of unsaturation of the former. There is no correlation between the metal content and the stability of the samples. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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