6533b856fe1ef96bd12b3326
RESEARCH PRODUCT
Structural and morphological rearrangements in quenched poly(ethylene) by simultaneous SAXS/WAXS
Diana SapoundjievaAntonino MartoranaStefano Piccarolosubject
Structure formationPolymers and PlasticsScatteringChemistrySmall-angle X-ray scatteringOrganic ChemistryPolyethyleneCondensed Matter PhysicsSynchrotronlaw.inventionchemistry.chemical_compoundCrystallographylawTacticityMaterials ChemistryLamellar structurePhysical and Theoretical ChemistryCrystallizationdescription
Structure formation by crystallization from the melt in a wide range of cooling rates (0.08-1 000°C/s) in low-density polyethylene has been studied by simultaneous small- and wide-angle X-ray scattering at the synchroton radiation source of DESY. The occurrence of two periodicities, characterized by different angular position of Bragg's maxima, was observed, pointing to the existence of two types of lamellar stacks, associated with two different long period values L 1 and L 2 (L 1 > L 2 ). L 1 depends on the cooling rate, whereas L 2 is almost constant. A comparison with isotactic polypropylene is performed, where a similar phenomenon takes place. While in the case of i-PP a definite correlation between the morphological features and the lamellar structure is observed and quantitatively demonstrated, the same cannot be stated in the case of PE.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-12-01 | Macromolecular Chemistry and Physics |