6533b872fe1ef96bd12d3afc
RESEARCH PRODUCT
SAXS/WAXS study of the annealing process in quenched samples of isotactic poly(propylene)
Diana SapoundjievaStefano PiccaroloAntonino Martoranasubject
Materials sciencePolymers and PlasticsScatteringSmall-angle X-ray scatteringAnnealing (metallurgy)Organic ChemistrySynchrotron Radiation SourceCondensed Matter PhysicsAmorphous solidCrystallographyTacticityMaterials ChemistryThickeningPhysical and Theoretical ChemistryMass fractiondescription
The structural rearrangement in samples of quenched isotactic poly(propylene) (iPP) submitted to different annealing treatments has been studied using simultaneous small- and wide-angle X-ray scattering (SAXS/WAXS) at the synchrotron radiation source of DESY, Hamburg. From a quantitative analysis of the WAXS profiles the values of the α-monoclinic, mesomorphic, and amorphous mass fractions coexisting in the material were determined. It is demonstrated that the SAXS patterns were characterized by two different long-period values that are attributed to α- and mesomorphic periodicity, respectively. The related α- and mesomorphic volume phase fractions, calculated from the analysis of the SAXS data, are compared with the corresponding WAXS results. The rearrangement of the initial structure involves i) the thickening of the already existing α-phase lamellae at the expenses of the amorphous regions and ii) the structural rearrangement of the mesomorphic phase leading to its transformation into the α-monoclinic one.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-03-01 |