α - to - β transformation on PVDF films obtained by uniaxial stretch

• Author(s): Sencadas, V. ; Moreira, V. ; Lanceros-Méndez, S. ; Pouzada, A. S. ; Gregório Júnior, R.
• Date: 2006
• Persistent ID: http://hdl.handle.net/1822/5170
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Ferroelectrics; Mechanical properties; Polymers; PVDF; FTIR; SEM
• Document Type: Article
• Language: English

Description

The α to β phase transformation of PVDF through the stretching process at different temperatures was investigated. The optimum stretching conditions were studied and characterised by infrared spectroscopy and differential scanning calorimetry. The maximum β−phase content was achieved at 80ºC and a stretch ratio of 5. Accompanying the phase transformation, a orientation of the polymer chains and a packing of the crystalline structure is observed. The stretch ratio does not significantly affect the degree of crystallinity.