Skip to main content
placeholder image

New technique of processing highly oriented poly(vinylidene fluoride) films exclusively in the β phase

Journal Article


Abstract


  • Oriented β-phase films were obtained by utilizing two different techniques: conventional uniaxial drawing at 80 °C of predominantly α-phase films, and by drawing almost exclusively β-phase films obtained by crystallization at 60 °C from dimethylformamide (DMF) solution with subsequent pressing. Wide angle X-ray diffraction (WAXD) and pole figure plots showed that with the conventional drawing technique films oriented at a ratio (R) of 5 still contained about 20% of phase a, a crystallinity degree of 40% and βphase crystallographic c-axis orientation factor of 0.655. Drawing at 90 °C and with R - 4 of originally β-phase films results in exclusively β-phase films with crystallinity degree of 45% and orientation factor of 0.885. Crystalline phase, crystallinity degree, and crystallographic c-axis orientation factor of both phases were also determined for αphase oriented films obtained by drawing α-phase films at 140 °C For films drawn at 140°C the α to βphase transition drops to about 22%. Reduction in crystallinity degree with increasing R is more pronounced at draw temperature of 140 °C compared with 80 °C Moreover, for both phases the c-axis orientation parallel to the draw direction is higher at draw temperature of 140 °C than at 80 °C. © 2007 Wiley Periodicals, Inc.

Publication Date


  • 2007

Citation


  • Branciforti, M. C., Sencadas, V., Lanceros-Mendez, S., & Gregorio, R. (2007). New technique of processing highly oriented poly(vinylidene fluoride) films exclusively in the β phase. Journal of Polymer Science, Part B: Polymer Physics, 45(19), 2793-2801. doi:10.1002/polb.21239

Scopus Eid


  • 2-s2.0-34748843935

Start Page


  • 2793

End Page


  • 2801

Volume


  • 45

Issue


  • 19

Abstract


  • Oriented β-phase films were obtained by utilizing two different techniques: conventional uniaxial drawing at 80 °C of predominantly α-phase films, and by drawing almost exclusively β-phase films obtained by crystallization at 60 °C from dimethylformamide (DMF) solution with subsequent pressing. Wide angle X-ray diffraction (WAXD) and pole figure plots showed that with the conventional drawing technique films oriented at a ratio (R) of 5 still contained about 20% of phase a, a crystallinity degree of 40% and βphase crystallographic c-axis orientation factor of 0.655. Drawing at 90 °C and with R - 4 of originally β-phase films results in exclusively β-phase films with crystallinity degree of 45% and orientation factor of 0.885. Crystalline phase, crystallinity degree, and crystallographic c-axis orientation factor of both phases were also determined for αphase oriented films obtained by drawing α-phase films at 140 °C For films drawn at 140°C the α to βphase transition drops to about 22%. Reduction in crystallinity degree with increasing R is more pronounced at draw temperature of 140 °C compared with 80 °C Moreover, for both phases the c-axis orientation parallel to the draw direction is higher at draw temperature of 140 °C than at 80 °C. © 2007 Wiley Periodicals, Inc.

Publication Date


  • 2007

Citation


  • Branciforti, M. C., Sencadas, V., Lanceros-Mendez, S., & Gregorio, R. (2007). New technique of processing highly oriented poly(vinylidene fluoride) films exclusively in the β phase. Journal of Polymer Science, Part B: Polymer Physics, 45(19), 2793-2801. doi:10.1002/polb.21239

Scopus Eid


  • 2-s2.0-34748843935

Start Page


  • 2793

End Page


  • 2801

Volume


  • 45

Issue


  • 19