FTIR studies on polymorphic control of PVDF ultrathin films by heat-controlled spin coater

Influence of Spray Drying Parameters on the Formation of β‐Phase Poly(vinylidene fluoride)

“…In contrast to these studies, however, the evaporation kinetics in this spray drying process is influenced by the amount of drying air. Nevertheless, a similar behavior like in 7, 22 is observed for spray drying with preheated drying air (Fig. 5).…”

“…4. The increase of the a-phase can be explained by the presence of higher temperatures like it is observed in [7,22].…”

“…Other publications show different results. It is mentioned that a high evaporation rate favors the formation of a-phase and reduces the formation of b-phase [7,22]. In these studies, the evaporation rate is increased by an increase in temperature.…”

A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

“…However, peaks in the range of 876-885, 1067-1075, 1171-1182 and 1398-1404 cm À1 have similar characteristics in samples of a-, band g-phases or other mixed systems. 19,21,22,46,65,66,73,74,100,103 In other words, these are common peaks that appear in all three phases. The exclusive peaks can be used to identify the corresponding crystalline phases, whereas the dual peaks may be the results of experimental uncertainty for small wavenumber shis (typically within 2 cm À1 ), or truely different phases depending on experimental conditions.…”

“…Processing parameters, such as mechanical, thermal, electrical and chemical treatments all affect the nal PVDF properties, including but not limited to electroactivity, dielectric and mechanical properties, antifouling behavior, and evoking cellular behavior. [7][8][9][10][11][12] Although FTIR has been widely used in characterizing PVDF, [13][14][15][16][17][18][19][20][21][22][23] reports in the existing literature (sometimes by the same authors) have many conicting characterization results based on FTIR results (Table 1), especially in the electroactive b and g phases. Two main reasons have resulted in this divergence.…”