Comparison of the thermal stability of the alpha, beta and gamma phases in poly(vinylidene fluoride) based on in situ thermal Fourier transform infrared spectroscopy

作者：Biswas Anirban; Henkel Karsten; Schmeisser Dieter; Mandal Dipankar^*

来源：Phase Transitions, 2017, 90(12): 1205-1213.

DOI：10.1080/01411594.2017.1337902

• PVDF
• thermal stability
• beta phase
• infrared spectroscopy
• in situ thermal FT-IR study

The electroactive beta phase of poly(vinylidene fluoride) (PVDF) is induced due to the aging time of PVDF solutions. The feasibility of the combination of the three crystalline polymorphs (alpha, beta and gamma) is demonstrated where their relative proportion within the PVDF film can be tailored by the simple monitoring of the preparation conditions. To identify all these phases, Fourier transform infrared (FT-IR) spectroscopy is carried out and it is spotlighted that the vibrational bands at 510 and 841 cm(-1) are not sufficient to state the formation of the beta phase. The main aim of this work is devoted to develop a better understanding on the thermal stability of these several phases of PVDF, which has a longstanding ambiguity persisting in this area. It has been found that the in situ thermal FT-IR spectroscopy is one of the best alternatives to understand this important issue. It is ascertained that the beta phase is the least thermally stable phase among alpha, beta and gamma phases, whereas the gamma phase is the most thermally stable phase.

• 出版日期2017