Inverse gas chromatographic observation of thermodynamic interaction between poly (vinylidene fluoride) and organic solvents

Tazaki, Michiko; Wada, Risei; Okabe, Masaru; Homma, Takeshi

doi:10.1007/s002890050578

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…To solve for M c , these equations require the polymer volume fraction of the swollen gel (V pol ), the molar volume of the solvent (V 0 ), the density of the polymer (r pol ), the Huggins solvent-polymer interaction parameter (m), the swelling factor (f) and the density of the solvent (r solv )-in this case cyclohexanone. Tazaki et al (2000) and Okabe et al (2003) have determined the Flory-Huggins interaction parameters (m) for PVDF homopolymer and a 12% HFP copolymer in cyclohexanone across a wide temperature range. Using their data, values of 0.3 and À0.3 were obtained for PVDF and 12% HFP copolymer, respectively.…”

Section: Sol-gel Analysismentioning

confidence: 99%

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Dargaville

Celina

Clough

2006

Radiation Physics and Chemistry

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Section: Sol-gel Analysismentioning

confidence: 99%

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Dargaville

Celina

Clough

2006

Radiation Physics and Chemistry

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“…It can be applied to observe the interaction between polymers and organic solvent systems under conditions approaching infinite dilution of the volatile component [11]. It is also used to determine the glass transition temperature (T g ) of polymers or amorphous pharmaceuticals and to study the plasticizing effect of water on these materials [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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Inverse gas chromatography (IGC) at infinite dilution is a powerful technique to characterize the superficial and interfacial properties of solid substrates as oxides, polymers or polymers adsorbed on oxides. It can also be used to determine the physicochemical properties and the transition phenomena of polymers. In this paper, IGC was used to determine the changes, as a function of temperature, of the specific free enthalpy DG a SP and deduce the specific entropy DS a SP of poly (methyl methacrylate) (PMMA) adsorbed on alumina or on silica for different tacticities of PMMA. The study of the surface properties of PMMA/SiO 2 and PMMA/Al 2 O 3 , revealed an important difference in the physicochemical behaviour of oxides covered by various concentrations of PMMA. This study also highlighted an important effect of the tacticity of the polymer on the specific entropy of PMMA adsorbed on oxides.

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“…Its crystallinity varies from 35 to 70%, depending on the method of preparation and the thermomechanical history. 1,2 PVDF can crystallize in five different structures depending on the crystallization conditions: TG þ TG À in the aand d-phases, all-trans (TTT) planar zigzag in the b-phase, and T 3 G þ T 3 G À in the cand e-phases. [3][4][5][6] Due to its piezo-and pyroelectrical properties, the b-phase has attracted more attention than the others; 7 the a-phase is the most common form, whereas the dand e-phases are only rarely observed.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Correlation Infrared Spectroscopic Study on the Crystallization and Gelation of Poly(Vinylidene Fluoride) in Cyclohexanone

Peng

Sun

2008

Appl Spectrosc

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Poly(vinylidene fluoride) (PVDF) converts easily into a thermo-reversible gel through crystallization by standing at room temperature in cyclohexanone. In this study, the Fourier transform infrared (FT-IR) spectra were measured continuously at room temperature during the conversion of the solution into a gel. The IR difference spectra derived from these spectra by absorbance subtraction clearly indicate the presence of PVDF alpha-crystallites in the gel due to the presence of absorption bands corresponding to the TG+TG- conformation of the alpha-phase. In the time interval from 25 to 45 min after the beginning of the experiment, the IR bands of PVDF increased dramatically, indicating the conversion of polymer chains from random statistical coils to the ordered TG+TG- conformation (alpha-form). In the time interval from 45 to 90 min, the IR bands of PVDF increased slowly, reflecting no further crystallization. Using two-dimensional (2D) IR analysis, it could be shown that the nu(C=O) absorption band of cyclohexanone changed during the gelation process. During the conformational ordering process (25-45 min), the nu(C=O) absorption band of the cyclohexanone dimer (1707 cm(-1)) decreased while the corresponding band of the monomer at 1718 cm(-1) increased. Furthermore, a new band at 1695 cm(-1) increased, which could be assigned to C=O groups of the solvent interacting with the CF2 groups in the polymer chain. The bands of the crystalline PVDF share positive cross-peaks with the bands of cyclohexanone, which indicates that the chain of PVDF changed prior to the cyclohexanone molecules during the conformational ordering process. However, these positive cross-peaks disappeared during the crystallization process, which means that the chain of PVDF changed synchronously with the solvent molecules. As for the bands of PVDF chains, the band at 762 cm(-1) varied prior to the bands at 873 cm(-1) and 796 cm(-1) during the conformational ordering process. The 762 cm(-1) absorption is assigned to the CF2 group of PVDF, the 873 cm(-1) absorption involves the C-C group of PVDF, and the 796 cm(-1) band is attributed to the CH2 groups of PVDF. Thus, the CF2 functionalities change faster than the C-C and CH2 groups. However, the correlation cross-peaks between 762 cm(-1) and 873 cm(-1) and at 796 cm(-1) disappeared during the later state of the gelation process. At the same time, the bands of PVDF and solvent still varied, which suggests that it is a physical interaction process between PVDF chain and solvent.

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Inverse gas chromatographic observation of thermodynamic interaction between poly (vinylidene fluoride) and organic solvents

Cited by 12 publications

References 2 publications

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Two-Dimensional Correlation Infrared Spectroscopic Study on the Crystallization and Gelation of Poly(Vinylidene Fluoride) in Cyclohexanone

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