Search results for "Shorter chains"

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The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET)

2012

[EN] The action of thermo-mechanical degradation induced by mechanical recycling of poly(ethylene terephthalate) was simulated by successive injection moulding cycles. Degradation reactions provoked chain scissions and a reduction in molar mass mainly driven by the reduction of diethyleneglycol to ethylene glycol units in the flexible domain of the PET backbone, and the formation of -OH terminated species with shorter chain length. The consequent microstructural changes were quantified taking into account a three-fraction model involving crystalline, mobile amorphous (MAF) and rigid amorphous fractions (RAF). A remarkable increase of RAF, to a detriment of MAF was observed, while the percen…

EthyleneSolucions polimèriquesPolymers and PlasticsInjection mouldingDifferential scanning calorimetry (DSC)Crystalline fractionsMechanical propertiesThermo-mechanical degradationchemistry.chemical_compoundDegradationAmorphous materialsPolymer blendsMaterials ChemistryMechanical recyclingRecyclingComposite materialDiethyleneglycolPoly(ethylene terephthalate) (PET)Injection moldingMolar massMechanical featureRecycled poly(ethylene terephthalate)Microstructural changesCondensed Matter PhysicsChain scissionRigid-amorphous fractionMechanics of MaterialsMAQUINAS Y MOTORES TERMICOSPolymer blendMaterials scienceMechanical performanceViscoelasticityEthyleneDifferential scanning calorimetrySegmental dynamicsInfrared analysis (FT-IR)Degradation reactionDifferential scanning calorimetryInjection mouldingPolyethylene terephthalatesEthylene glycolTermoplàsticsCrystalline materialsShorter chainsAmorphous solidchemistryGlass-rubber relaxationProcessing cyclesEthylene glycol
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