High energy ion irradiation of semicrystalline polyvinylidene fluoride (PVDF) films changes its melting behaviour. After irradiation with 9 MeV carbon beam, differential scanning calorimetry of PVDF films exhibits a quite complex behavior in the temperature range 20-200-degrees-C. At low ion fluence irradiation ( < 10(12) ionS/CM2) the enthalpy of melting is constant (58.0 J/g), but a broad transition is observed before the melting temperature (160-degrees-C). At high fluences (10(12)-10(13) ions/cm2) the enthalpy of melting decreases exponentially and the PVDF evolves into a insoluble carbon network. The crystalline polymer component decreases from 50% to 2% as suggested by the thermal analysis and the X-ray diffraction measurements.
|Titolo:||CALORIMETRIC MEASUREMENTS OF MEV ION-IRRADIATED POLYVINYLIDENE FLUORIDE|
|Data di pubblicazione:||1994|
|Appare nelle tipologie:||1.1 Articolo in rivista|