Search results for " greenhouse films"

showing 2 items of 2 documents

Processability and Properties of Re-Graded, Photo-Oxidized Post-Consumer Greenhouse Films

2005

The recycling of post‐consumer plastics leads, in general, to secondary materials having properties worse than those of the reclaimed material and certainly worse than those of the same virgin polymer. This is because of the degradation undergone by the objects during their use and because of the thermo‐mechanical degradation undergone during the reprocessing operations. The change of the molecular architecture is responsible for this worsening of properties. The use of stabilizing systems can slow the degradation during the melt processing but cannot give any improvement of the final properties of the material. In order to enhance the properties of the recycled plastics, some rebuilding of…

chemistry.chemical_classificationMaterials scienceFlow curvePolymers and PlasticsGeneral Chemical EngineeringOrganic ChemistryPolymermechanical properties post‐consumer greenhouse films processability regradation rheological propertiesBranching (polymer chemistry)Molten statechemistryRheologyMaterials ChemistryMolar mass distributionExtrusionPolymer blendComposite materialMacromolecular Materials and Engineering
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Reprocessing and restabilization of greenhouse films

2002

From the ecological and economical points of view, reprocessing of polyethylene greenhouse films is a promising solution to reduce discarded materials and to produce useful, or potentially useful, objects for service. Films exposed outdoors, however, show inferior mechanical properties and the melt processing worsens these properties. The addition of stabilizers and antioxidants to recycled plastic products prevents inherent thermal instabilities from occurring within the time frame of proper processing. In this study, we attempt to explore ways for improving product performance by the addition of four different additives when the recycled films undergo intensive shear processing. The proce…

Materials sciencePolymers and Plasticsbusiness.industryGreenhouseMineralogyPolyethyleneCondensed Matter Physicsrecycling greenhouse films restabilizationchemistry.chemical_compoundTime framechemistryRheologyMechanics of MaterialsUltimate tensile strengthMaterials ChemistryProcess engineeringbusinessStabilizer (chemistry)
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