Solubility parameters of poly(vinylidene fluoride)

Bottino, A.; Capannelli, G.; Munari, S.; Turturro, Antonio

doi:10.1002/polb.1988.090260405

Cited by 241 publications

(136 citation statements)

References 13 publications

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“…Both MEK and THF were good swelling agents [22] at 60 8C for PVDF and good solvents for PMMA at room temperature [23]. The DMF was a strongly polar solvent which is good solvent for PVDF [23] and also can dissolve PMMA at room temperature in this work.…”

Section: Films Prepared By Solution Castingmentioning

confidence: 98%

β-Phase of poly(vinylidene fluoride) formation in poly(vinylidene fluoride)/poly(methyl methacrylate) blend from solutions

Zhang

Chen

et al. 2008

Applied Surface Science

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Section: Films Prepared By Solution Castingmentioning

confidence: 98%

β-Phase of poly(vinylidene fluoride) formation in poly(vinylidene fluoride)/poly(methyl methacrylate) blend from solutions

Zhang

Chen

et al. 2008

Applied Surface Science

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“…In this line of development, through a comprehensive study on dope solution compositions, hydrophobic PVDF flat-sheet membranes with permeation flux of 9.7 kg/m 2 h was prepared by Tomaszewska et al for MD process [4]. Bottino et al [5] further carried out a systematic study on the choice of appropriate organic solvents for PVDF membrane preparation, and more works have been done with the consideration of solvents effect on membrane morphology, hydrophobicity, micro-structure and separation performance [6]. In addition, research efforts had been made to the optimization of the preparation conditions, especially for hollow fiber membrane spinning.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Wang

Zheng

et al. 2016

Journal of Membrane Science

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a b s t r a c tHydrophobic polyvinylidene fluoride (PVDF) membranes have been used in membrane distillation, however its performance in terms of permeation flux and salt rejection still needs to be improved. In this study, polyvinylidenedifluoride-co-chlorotrifluoroethylene (PVDF-CTFE), a PVDF based copolymer, was employed to fabricate both flat sheet and hollow fiber membranes. Two pore forming additives (PEG and LiCl) were used in order to examine their effects on the membrane micro-structure and consequently the distillation performance. The crystalline property of the polymers was studied via X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) to reveal its role in the membrane formation. The membrane morphology (SEM), surface property (AFM) and membrane properties (contact angle, pore size, porosity and pore size distribution) were systematically examined and compared among PVDF, PVDF-CTFE membranes as well as their counterparts with pore forming additives. The results revealed that PVDF-CTFE membrane exhibited optimal membrane morphology, pore structure and hydrophobicity, thus delivering better distillation performance (permeation flux up to 62.09 kg/m 2 h, and distillate conductivity as low as 5 μS/cm) in comparison with their PVDF membrane counterparts.

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“…The solubility parameters of DEC, PC and GBL are 18.0, 27.2 and 25.8 (MPa 1/2 ), respectively. 20 According to Bottino et al, 21 PVdF has a solubility parameter of 23.2 (MPa 1/2 ). The swelling ratios tended to increase as the solubility parameters for the solvent and PVdF were closer, that is, as the polymer becomes more soluble in the solvent.…”

Section: Resultsmentioning

confidence: 99%

Sol-gel transitions of poly(vinylidene fluoride) in organic solvents containing LiBF4

Shimizu

Arioka

Ogawa

et al. 2011

Polym J

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Poly(vinylidene fluoride) (PVdF) dissolved in organic solvents containing lithium tetrafluoroborate (LiBF 4 ) forms stable gels when the solution is cooled to room temperature. Here, we describe the effects of LiBF 4 concentration and different gelation solvents on the gelation process, and characterize the resulting structural morphology using several techniques. Diethyl carbonate (DEC), propylene carbonate (PC) and c-butyrolactone (GBL) were used as gelation solvents. Time-resolved Fourier transform infrared spectroscopic measurements showed that the conformational transition from TGT G to T 3 GT 3 G occurred with the addition of lithium salts to the PVdF/DEC gel. In addition, PVdF produces thermoreversible gels in GBL and PC containing LiBF 4 , by assuming a T 3 GT 3 G conformation regardless of the LiBF 4 concentration. Scanning electron microscopy studies have indicated the presence of spherulites in the gels. Spherulite size decreased with increasing LiBF 4 concentration, whereas gel-melting temperatures increased with an increase in LiBF 4 concentration. These results indicate that gelation of PVdF in the presence of LiBF 4 occurs as polymer chains assuming the T 3 GT 3 G conformation, imparting the resulting gels with increased thermal stability. Polymer Journal (2011) 43, 540-544; doi:10.1038/pj.2011.21; published online 13 April 2011Keywords: lithium ion; molecular conformation; polymer gel electrolyte; poly(vinylidene fluoride); thermoreversible gel INTRODUCTION Polymer electrolytes have attracted much attention in lithium-battery technology because they enable fabrication of safe and reliable highenergy, high-power secondary lithium batteries. 1 Typical examples of polymer electrolytes include complexes of a lithium salt (LiX) with PEO (polyethylene oxide). The conductivity of PEO-LiX electrolytes reaches practically useful values of B10 À4 S cm À1 at temperatures of 60-80 1C but decreases to 10 À7 S cm À1 at room temperature. 2 Decrease in the conductivity on cooling is because fast ion transport occurs only in the amorphous state of the polymer.The most promising approach for improving conductivity at room temperature is to immobilize a highly conductive liquid electrolyte within a polymer matrix. This type of electrolyte is called a polymer gel electrolyte. This system demonstrates high ionic conductivity at room temperature with sufficient mechanical strength. 3,4 Among the matrices used for polymer gel electrolytes are PVdF, 5,6 poly(methyl methacrylate), 7,8 and poly(acrylonitrile). 9,10 Gel electrolytes based on PVdF are of great interest because of their good thermal, mechanical and electrochemical stability. Recent studies have shown that the ionic conductivity of PVdF gel electrolytes is related to the morphology of the gel. 11 However, a detailed characterization of these gels with regard to the gelation process and structural morphology has not been undertaken. In a previous study, we reported our investigation of the gelation process of PVdF in a number of organic solvents without a lith...

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Solubility parameters of poly(vinylidene fluoride)

Cited by 241 publications

References 13 publications

β-Phase of poly(vinylidene fluoride) formation in poly(vinylidene fluoride)/poly(methyl methacrylate) blend from solutions

β-Phase of poly(vinylidene fluoride) formation in poly(vinylidene fluoride)/poly(methyl methacrylate) blend from solutions

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Sol-gel transitions of poly(vinylidene fluoride) in organic solvents containing LiBF4

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