Abstract
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 °C until fine 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 Transform Infrared Spectroscopy (ATR-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 β 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 β phase in polymorphism among those other stretching time. This β phase is desirable in PVDF because the development is required in sensor application.
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