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RESEARCH PRODUCT
Recycling of high density polyethylene containers
M.kostadinova LoultchevaM. ProiettoF. P. La MantiaN. Jilovsubject
chemistry.chemical_classificationMaterials sciencePolymers and PlasticsChain scissionPolymerRaw materialCondensed Matter PhysicsBranching (polymer chemistry)chemistryRheologyMechanics of MaterialsHomogeneousMaterials ChemistryHigh-density polyethyleneComposite materialdescription
The recycling of homogeneous high density polyethylene from containers for liquids gives rise to materials having mechanical properties that are strongly dependent on the reprocessing apparatus and the processing conditions. The thermomechanical degradation during processing gives rise to different modifications of the structure depending on the temperature, residence time and applied stress. In general, it is possible to say that if the reprocessing operations are carried out in apparatus with low residence time, the mechanical and rheological properties of the raw materials are only slightly influenced by the recycling operations. Significant degradation phenomena and reduction of some mechanical properties are observed on increasing the number of recycling steps in apparatus with large residence times. By adding antioxidant agents the polymer maintains the initial properties even after several recycling cycles. The competition between formation of chain branching and chain scission can be considered to be responsible for this behaviour.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-07-01 | Polymer Degradation and Stability |