2005
DOI: 10.1366/0003702053585336
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Phase Transition in Poly(Vinylidene Fluoride) Investigated with Micro-Raman Spectroscopy

Abstract: The phase transition from the non-polar alpha-phase to the polar beta-phase of poly(vinylidene fluoride) (PVDF) has been investigated using micro-Raman spectroscopy, which is advantageous because it is a nondestructive technique. Films of alpha-PVDF were subjected to stretching under controlled rates at 80 degrees C, while the transition to beta-PVDF was monitored by the decrease in the Raman band at 794 cm(-1) characteristic of the alpha-phase, along with the concomitant increase in the 839 cm(-1) band charac… Show more

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Cited by 101 publications
(80 citation statements)
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“…The spectra are all similar to each other, dominated by the band at 795 cm 1 characteristic of the˛-phase and assigned to CH 2 rocking. 22,23 In terms of polarization, the incident laser was used either circularly or in other two directions perpendicular to each other (Fig. 2).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The spectra are all similar to each other, dominated by the band at 795 cm 1 characteristic of the˛-phase and assigned to CH 2 rocking. 22,23 In terms of polarization, the incident laser was used either circularly or in other two directions perpendicular to each other (Fig. 2).…”
Section: Resultsmentioning
confidence: 99%
“…2 are given in Table 1. 22,23 Fig. 3 depicts the Raman spectra collected from room temperature (25°C) to 180°C (after melting) and at room temperature again (after cooling).…”
Section: Resultsmentioning
confidence: 99%
“…In fact, PVDF can exhibit four crystalline phases (α, β, γ and δ) that can be differentiated by the C-C bond conformation along its main polymeric chain and by their piezoactivity [33]. The polar β-phase is the most interesting for practical applications once it shows very intense piezoelectric and pyroelectric responses [34]. Furthermore, the amounts of crystalline phase and the percentage of the β-phase can be tuned by adequate protocols of samples processing.…”
Section: (Propriedades Mecânicas E Bioativas Do Compósito Pvdf-bcp) Rmentioning
confidence: 99%
“…It is well known that changes of the processing conditions and preparation of PVDF film samples lead to significant changes of their morphology [1][2][3][4][5][6][7]. Depending on these conditions, three PVDF conformations: α-, β-, and γ-phases can be observed [7,8].…”
Section: Introductionmentioning
confidence: 99%