A STUDY ON THERMO-OPTIC EFFECT OF β POLY(VINYLIDENE FLUORIDE) THIN FILMS PREPARED BY SOLUTION CASTING METHOD

Yingxue Xi (), Huiqing Fan, Weiguo Liu, Chen Yang and Xiaoling Niu
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Yingxue Xi: State Key Lab of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China
Huiqing Fan: State Key Lab of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China
Weiguo Liu: School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710032, P. R. China
Chen Yang: State Key Lab of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China
Xiaoling Niu: School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710032, P. R. China

Surface Review and Letters (SRL), 2008, vol. 15, issue 01n02, 175-181

Abstract: The Poly(vinylidene) fluoride (PVDF) thin films with a high content of β-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 β- and γ-phase formation of PVDF. The β phase films were obtained with heat treatment at temperatures ranging from 60°C to 120°C and annealing at 120°C after casting from DMF. The thermo-optical effect of β phase PVDF films was investigated using a spectroscopic ellipsometer. At temperatures ranging from 20°C to 100°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 × 10-4/°C at the ascending stage of temperature and 3.0 × 10-4/°C at the descending stage of temperature. Therefore, it is possible to use the thermo-optic effect of the β phase PVDF for long wavelength infrared imaging.

Keywords: PVDF; β-phase; polymer; crystallinity; thermo-optical effect (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011172

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