A STUDY ON THERMO-OPTIC EFFECT OF Î² POLY(VINYLIDENE FLUORIDE) THIN FILMS PREPARED BY SOLUTION CASTING METHOD
The Poly(vinylidene) fluoride (PVDF) thin films with a high content of Î²-phase were prepared by controlling heat-treatment temperature using casting from the poled solvents. The crystallite microstructure of thin films was depicted by the techniques of X-ray diffraction and FTIR. The results showed that heat treatment was favorable for inducing the Î²- and Î³-phase formation of PVDF. The Î² phase films were obtained with heat treatment at temperatures ranging from 60Â°C to 120Â°C and annealing at 120Â°C after casting from DMF. The thermo-optical effect of Î² phase PVDF films was investigated using a spectroscopic ellipsometer. At temperatures ranging from 20Â°C to 100Â°C, the refractive index of PVDF was negatively correlated with the temperature between 350 and 1500 nm. The value of the t.o. coefficient of PVDF films was calculated at all temperatures. The maximum value of the t.o. coefficient was about 3.3 Ã 10-4/Â°C at the ascending stage of temperature and 3.0 Ã 10-4/Â°C at the descending stage of temperature. Therefore, it is possible to use the thermo-optic effect of the Î² phase PVDF for long wavelength infrared imaging.
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