Crystal structure and thermal properties of poly(vinylidene fluoride)-carbon fiber composite films with various drawing temperatures and speeds |
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Authors: | S H Lee H H Cho |
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Institution: | (1) State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China; |
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Abstract: | PVDF-CF composite films were prepared using a melt pressing method. The PVDF-CF composite films were cut into rectangular
shapes with a gauge length and width of 10 and 5 mm, respectively. The films were drawn using a universal testing machine
equipped with a hot chamber. The drawing temperatures and speeds were 50∼150 °C and 100∼000 %/min, respectively. The crystal
structure and physical properties of the resulting PVDF-CF films were investigated by wide angle X-ray diffraction, Fourier
transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis and scanning electron microscopy.
The crystal form of the initial films was the 〈alpha〉 phase (non polarity, lamellar structure) of PVDF. The maximum draw ratio
was 4.2. The drawn PVDF-CF films prepared at 100 °C were mainly the 〈beta〉 phase (polarity, fibrillar structure) of PVDF.
With increasing drawing speeds, the 〈alpha〉 phase became the dominant phase of PVDF in the PVDF-CF films. The thermal properties
of the PVDF-CF films improved with increasing drawing temperature, and the dynamic mechanical properties improved with increasing
drawing speed. |
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Keywords: | |
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