INVESTIGATION ON THE EFFECT OF EXTENSIONAL FLOW ON THE !I-CRYSTALLINE PHASE FORMATION IN EXTRUDED PVDF FILMS

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SOBHANI H.; YOUSEFI A.A.; RAZAVI NOURI M.

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Paper Information

Journal: Iranian Journal of Polymer Science and Technology Year:2006 | Volume:19 | Issue:1 (ISSUE NO. 81) Page(s): 43-51

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Title

INVESTIGATION ON THE EFFECT OF EXTENSIONAL FLOW ON THE !I-CRYSTALLINE PHASE FORMATION IN EXTRUDED PVDF FILMS

Author(s)

SOBHANI H. | YOUSEFI A.A. | RAZAVI NOURI M. | Issue Writer Certificate

Keywords

POLYVINYLIDENE FLUORIDEQ3

EXTENSIONAL FLOWQ3

CRYSTALLINE PHASEQ3

COLD DRAWINGQ3

FTIR SPECTROSCOPYQ3

Abstract

Applying of the EXTENSIONAL FLOW on poly (vinylidene fluoride) while it is in the molten state is a specific method for converting α to β forms as wellas increasing the amount of β crystallinef orm. In this paper, the effect of EXTENSIONAL FLOW during film extrusion on the β CRYSTALLINE PHASE content and piezoelectric properties of extruded PVDF films has been investigated. The PVDF films were extruded at different draw ratios by using the designed two-channel die having converging walls which can apply high EXTENSIONAL FLOW to the PVDF melt and also an ordinary slit die. The amount of β crystalline structure and piezoelectric properties of the films produced by these two dies were compared using wide angle X-ray diffract meter (WAXD), differential scanning calorimeter (DSC) and d33-tester. The results revealed that while the d33 value for the samples prepared by the slit die was zero at all draw ratios. The d33 value for the films prepared using a two-channel die equivalent to be 21 pC/N for samples drawn in the molten state was found to have a draw ratio of 9. The samples prepared from the two dies were also drawn under optimum conditions (80-90°C, strain of 400-500% and strain ratio of 5 min-1) and their β-phase contents and d33 values compared with each other at equal draw ratios. Using Fourier transform infrared spectrometer (FTIR), a maximum β-phase content of 83% was found for the films produced using the two-channel die which was 8% higher than what was found from the samples prepared by a slit die. The d33 value for the films produced from the designed die was also found to be 35pC/N which was 5pC/N higher in value than that of the samples prepared by a slit die.

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APA: Copy

SOBHANI, H., YOUSEFI, A.A., & RAZAVI NOURI, M.. (2006). INVESTIGATION ON THE EFFECT OF EXTENSIONAL FLOW ON THE !I-CRYSTALLINE PHASE FORMATION IN EXTRUDED PVDF FILMS. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 19(1 (ISSUE NO. 81)), 43-51. SID. https://sid.ir/paper/6660/en

Vancouver: Copy

SOBHANI H., YOUSEFI A.A., RAZAVI NOURI M.. INVESTIGATION ON THE EFFECT OF EXTENSIONAL FLOW ON THE !I-CRYSTALLINE PHASE FORMATION IN EXTRUDED PVDF FILMS. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2006;19(1 (ISSUE NO. 81)):43-51. Available from: https://sid.ir/paper/6660/en

IEEE: Copy

H. SOBHANI, A.A. YOUSEFI, and M. RAZAVI NOURI, “INVESTIGATION ON THE EFFECT OF EXTENSIONAL FLOW ON THE !I-CRYSTALLINE PHASE FORMATION IN EXTRUDED PVDF FILMS,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 19, no. 1 (ISSUE NO. 81), pp. 43–51, 2006, [Online]. Available: https://sid.ir/paper/6660/en

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