研究目的
To understand how composition and preparation conditions affect the different crystalline phases and the final crystalline morphology in P(VDF-TrFE-CFE) terpolymers.
研究成果
Introduction of CFE into P(VDF-TrFE) copolymer converts ferroelectric β phase to paraelectric α and γ phases. Annealing increases the paraelectric phase fraction and stabilizes it, with higher CFE content leading to larger crystallites and more stable paraelectric phases. XRD confirms lattice expansion and increased crystallite size in terpolymers compared to copolymers.
研究不足
The study is limited to specific compositions (55.4/37.2/7.3 mol% and 62.2/29.4/8.4 mol%) and annealing conditions; terpolymer samples with a range of CFE contents would be needed for a more detailed understanding.
1：Experimental Design and Method Selection:
The study investigates the effects of chemical composition and annealing on crystalline phases and morphology using FTIR spectroscopy and XRD.
2：Sample Selection and Data Sources:
Terpolymer films with VDF/TrFE/CFE compositions of
3：4/2/3 mol% (ISL 27) and 2/4/4 mol% (Arkema) were used, along with P(VDF-TrFE) copolymer (75/25 mol%) as reference. Samples were prepared by drop casting from acetone solution and annealed at 120°C in vacuum. List of Experimental Equipment and Materials:
FTIR spectrometer (Bruker Alpha-P, ATR mode), X-ray diffractometer (PANalytical Empyrean, transmission mode), terpolymer samples from Piezotech S.A. and Arkema-Piezotech, solvents (acetone, acetonitrile), glass substrates, polyimide films.
4：Experimental Procedures and Operational Workflow:
Films were cast, dried at room temperature, annealed (some samples), and characterized using FTIR and XRD at room temperature.
5：Data Analysis Methods:
FTIR absorbances were used to calculate phase fractions using the method of Osaki et al.; XRD data were analyzed with the Scherrer equation to determine coherence lengths.
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