Effect Of Various Mechanical Stretching Time On Polymorphism Of Polyvinylidene Fluoride (Pvdf) Thin Films

Polyvinylidene Fluoride (PVDF) thin films were prepared using solvent casting technique at constant formulation and stretched with various mechanical stretching time (1, 2, 3, 4 and 5 minutes). PVDF were stirred for 24 hours by magnetic stirrer at 600 rpm and were casted on glass petri dish before dried in an oven at 115 degrees C until tine thin film formed. The thin film successfully stretched with tensile machine with constant speed at 10 mm/min at different stretching time. The different of polymorphism on PVDF thin films were studied using Differential Scanning Calorimetry (DSC) and Attenuated Total Reflectance Fourier Transfonn Infrared Spectroscopy (AIR-FTIR). Three minutes stretching time showed to experience a yielding and necking area. Degree of crystallinity calculated also revealed that three minutes stretching time have the highest number which is 51.57% crystallinity. In addition, three minutes stretching time has been identified to have high beta phase observed by ATR-FTIR due to shifting and decreasing intensity at 1178 cm(-1) while increasing of transmittance at 834 cm(-1) wavenumbers. Thus, it is concluded that three minutes stretched PVDF thin film have high beta phase in polymorphism among those other stretching time. This beta phase is desirable in PVDF because the development is required in sensor application.