Thermoreversible gelation of poly(vinylidene fluoride) in γ-butyrolactone solution

Cho, Jae Whan; Song, Ha Yool; Kim, Sang Yong

doi:10.1016/0032-3861(93)90224-x

Cited by 51 publications

(63 citation statements)

References 17 publications

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“…8 The structure and physical properties of PVdF gel have been studied by many workers. [9][10][11][12][13] The present authors investigated gelation process of PVdF homopolymer in many organic solvents from measurements of both time-resolved Fourier transform infrared (FT-IR) spectroscopy and dilatometry. [14][15][16][17] Tashiro et al studied the structural change during the gelation process and the resultant aggregation structure of PVdF polymer and solvent molecules in the gel through measurement of the time-resolved FT-IR.…”

mentioning

confidence: 99%

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Okabe

Wada

Tazaki

et al. 2003

Polym J

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ABSTRACT:The Flory-Huggins interaction parameter (χ 12 ) between poly(vinylidene fluoride) (PVdF) and organic solvent was estimated experimentally over wide range of temperature by an inverse gas chromatography (IGC) using many kinds of solvents such as alkane, alkene, ketone, lactone, and nitrogen-containing solvent. The thermoreversible gelation of PVdF solution was discussed from the magnitude of interaction parameter χ 12 between PVdF and solvent. The parameter χ 12 was measured for a concentrated PVdF solution by the usual IGC technique. The parameter χ 12 obtained for each PVdF/solvent system increased slowly with decreasing temperature. The present systems were divided broadly into three groups according to the magnitude of χ 12 in the vicinity of room temperature, i.e., group (a) with χ 12

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mentioning

confidence: 99%

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Okabe

Wada

Tazaki

et al. 2003

Polym J

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“…In particular, the gelation of PVDF in γ -butyrolactone, whose structure is similar to propylene carbonate (PC) and other solvents such as diethyl adipate and glyceryl tributyrate, shows the formation of a transparent and thermoreversible gel. [6][7][8] The gelation of PVDF was also studied in acetophenone, benzoate, and in ethyl benzoate. [9][10][11] In these works, the tilting method is widely used for the determination of the gelation line.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…This indicates that crystallization is not necessary for gelation. [ 6 ] Indeed, upon cooling, the homogeneous solution starts to separate fi rst by crossing the gelation boundary either …”

Section: Infrared Spectroscopymentioning

confidence: 99%

Ternary Diagrams of Poly(vinylidene fluoride) and Poly[(vinylidene fluoride)‐co‐hexafluoropropene] in Propylene Carbonate and Dimethyl Sulfoxide

Akkoyun

Carrot

Blottière

2012

Macro Chemistry & Physics

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Experiments on the thermoreversible gelation of a ternary system composed of poly(vinylidene fl uoride) (PVDF) and poly[(vinylidene fl uoride)-co -hexafl uoropropene] (P(VDF-co -HFP)) in propylene carbonate (PC) or DMSO solutions are carried out and the resulting ternary diagrams are plotted for various systems. The results show that the gelation occurs at relatively low concentrations. The miscibility area of the ternary diagram is larger with DMSO than with PC. In addition, the concentration at the gelation point increases with increasing temperature. The gelation line is almost independent of the molecular structure of PVDF in PC but varies in DMSO. This variation of the miscibility is essentially connected to the carboxylic functions on the PVDF chain.by solvent casting or precipitation by a nonsolvent. This technique requires a good control of the solubility and homogeneity of the initial solution together with that of the phase separation at various temperatures and concentrations because the morphology is dependent on these conditions. The combination of good and bad solvents with a polymer is commonly used and strong attention has been focused on three-component phase diagrams in the literature.In contrast, active components such as gel electrolytes are also obtained by intimate mixing of the polymers within a solvent. The relevant mixture is most likely to be a combination of two polymers within a solvent because blends of vinylidene fl uoride (VDF)-based polymers enable the fi ne tuning of the properties of the materials. These gels are usually obtained from a homogeneous solution at high temperature and gelation is obtained by lowering the temperature. Ternary diagrams involving such mixtures are less reported in the literature, which mostly concentrates on (PVDF/solvent) binary diagrams and on the

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“…[15][16][17] Especially, Cho et al have found first that PVDF/γ-butyrolactone(BL) system can form a transparent and thermoreversible gel. 9 Next Nandi and his coworkers [10][11][12][13][14] systematically have investigated this physical gelation phenomena of PVDF in a wide range of concentration and temperature in various solvents such as acetophenone, ethyl benzoate and glyceryl tributyrate. One of their observations is that physical gelation occurs even at very low polymer concentration like C gel ~1 wt%.…”

mentioning

confidence: 99%

“…In addition, recently, thermoreversible physical gelation [1][2][3][4][5][6][7][8] is regarded as another interesting field of PVDF on the ground of the reports of Cho, 9 Nandi, [10][11][12][13][14] and Park. [15][16][17] Especially, Cho et al have found first that PVDF/γ-butyrolactone(BL) system can form a transparent and thermoreversible gel.…”

mentioning

confidence: 99%

Existence of Critical Aggregation Concentration at the Very Dilute Regime of Poly(vinylidene fluoride)/Propylene Carbonate System

Park

Xu²,

Ling³

et al. 2007

Bulletin of the Korean Chemical Society

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Thermoreversible gelation of poly(vinylidene fluoride) in γ-butyrolactone solution

Cited by 51 publications

References 17 publications

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Ternary Diagrams of Poly(vinylidene fluoride) and Poly[(vinylidene fluoride)‐co‐hexafluoropropene] in Propylene Carbonate and Dimethyl Sulfoxide

Existence of Critical Aggregation Concentration at the Very Dilute Regime of Poly(vinylidene fluoride)/Propylene Carbonate System

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