Ionic liquid modified poly(vinylidene fluoride): crystalline structures, miscibility, and physical properties

Xing, Chenyang; Zhao, Mingbo; Zhao, Liping; You, Jichun; Cao, Xin; Li, Yongjin

doi:10.1039/c3py00466j

Cited by 192 publications

(258 citation statements)

References 54 publications

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“…Dynamic mechanical loss tangent (tan δ) as a function of temperature for neat P(VDF-CTFE) and all blends with IL-C18 (A) and IL-108 (B). Note: the relaxation peaks from 75 to 100°C are ascribed to imperfections in the crystalline phase, 23,56 which can also be verified by the presence in the first heating run ( Figure S1A) and absence in the second heating run ( Figure S1C) from the DSC thermograms in the Supporting Information.…”

Section: Discussionmentioning

confidence: 72%

“…The second T g (RAF) relaxation peaks are not shown for neat P(VDF-CTFE) and blends containing 2 wt % of both ILs because of the very weak intensity in dynamic mechanical spectroscopy. 23 With gradually adding both ILs from 5 to 10 wt %, the RAF relaxation peaks are more visible and shift to lower temperature. Moreover, IL-108 induces lower values of T g (RAF) than IL-C18 with the same IL amount.…”

Section: Macromoleculesmentioning

confidence: 98%

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Understanding of Versatile and Tunable Nanostructuration of Ionic Liquids on Fluorinated Copolymer

et al. 2015

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International audienceA fundamental understanding of the versatile and tunable nanostructuration effect of two phosphonium ionic liquids (ILs), denoted octadecyltriphenylphosphonium iodide (IL-C18) and tributyl(methyl)phosphonium methylsulfate (IL-108), on a semicrystalline fluorinated copolymer poly(vinylidene fluoride-co-chlorotrifluoroethylene) (P(VDF-CTFE)) was elaborated. This research suggests that the nanostructuration mechanism is very dependent on the diffusion and interacting abilities of ILs in matrix, which are determined by the chemical structures of ILs. Both LLs appear to diffuse and regularly assemble in the rigid amorphous fraction (RAF) of P(VDF-CTFE) between crystalline lamellae thanks to the "template" confinement effect of 2D structure. The assembled structure shows a gradually regular ID to 2D geometric evolution with increasing the ILs amount revealed by Porod exponents in SANS analyses. Simultaneously, these regularly assembled ILs in the RAF also act as "template" to efficiently induce a complete transition of nonpolar alpha-phase to polar gamma- and/or beta-phase with only a tiny amount of ILs (from 2 wt %) (by XRD and FTIR). Moreover, the crystallization displays a depression behavior with reduced T-c, T-m, crystallinity (by DSC), and crystallite size (by SANS) due to the existence of ILs in the RAF seen as obstacle for the regular chain-folding and the dipolar interaction with P(VDF-CTFE). We propose that the synergistic influence of mutual "templates" endues phosphonium ILs a versatile nanostructuration on the fluorinated matrix. Moreover, this versatile nanostructuration effect can be easily tuned by tailoring the chemical structures of ILs. The difference in the chemical structures of ILs endows them different diffusion rates upon crystallization from solution for preparing resulting blend films and strengths of dipolar interaction with P(VDF-CTFE), consequently affecting their dispersion state in the matrix to reside in the RAF with different extents and interacting abilities (confirmed by IDEA and DMA). Thus, IL-108 with faster migration rate and stronger dipolar interaction than IL-C18 (due to the smaller steric hindrance and extra polar groups in the cation/anion combination of the IL structure) locates in the RAF much more to induce more trans-configuration (beta-phase), more homogeneous dispersion morphology, and higher depression of crystallization

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Section: Discussionmentioning

confidence: 72%

Section: Macromoleculesmentioning

confidence: 98%

Understanding of Versatile and Tunable Nanostructuration of Ionic Liquids on Fluorinated Copolymer

et al. 2015

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“…In this way, PVDF has been widely used in the production of composites for diverse applications [13]. The incorporation of IL in the PVDF matrix works as plasticizer [14], promotes the b crystalline phase in PVDF [15], has good miscibility [16,17] and increases the ionic conductivity, which is useful in the production of solid polymer-based electrolytes for batteries, fuel cells and supercapacitors [18]. The incorporation of the IL into the polymer matrix can be performed in the form of film [19], porous membranes [20] or fibers [21], including also the possible control of the hydrophobicity [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of ionic liquid anion and cation on the physico-chemical properties of poly(vinylidene fluoride)/ionic liquid blends

Mejri

Dias

Lopes

et al. 2015

European Polymer Journal

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“…Mandal, A and Nandi, AK 15 showed that the IL/MWCNT (3-aminoethyl imidazolium bromide, [C 2 NH 2 IM][Br], modified MWCNT) is an efficient nucleating agent for PVDF crystallization and nucleate preferentially the β phase due to its dipolar interactions with PVDF. Li and coworkers 16 used an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF 6 ], for the functionalization of MWCNT into the PVDF matrix and reported that IL/MWCNT shows significant synergetic effects on both the nucleation and the formation of polar crystals of PVDF. In another study, they used the same hydrophobic ionic liquid [BMIM][PF 6 ], for the fabrication of MWCNT into the PMMA matrix, highlighting the compatibilizing and plasticizing role of the IL into the PMMA matrix.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of PVDF filled with multi wall carbon nanotubes modified by amphiphilic ionic liquid

Bahader

Gui

et al. 2015

Macromol. Res.

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The special electric properties of the poly(vinylidene fluoride) (PVDF) is strongly dependent on its crystalline structural morphology. In this study, modification in the crystal structure of PVDF was achieved by utilizing the long alkyl chain ionic liquid (1-hexadecyl-3-methylimidazolium bromide, [C 16 mim][Br]) and ionic liquid modified multiwalled carbon nanotubes (MWCNT). The developed crystal pattern was analyzed by XRD and the compatibility and dispersion characteristics of MWCNT in the matrix was observed by FESEM. The isothermal and non-isothermal crystallization kinetics were studied by DSC and different models namely; Avrami, Jeziorny and Ozawa were applied to fit the data. The results demonstrate that crystal structure of PVDF is significantly changed and the dispersion of MWCNT was enhanced with the addition of ionic liquid (IL). Kinetically, the crystallization was influenced and became fast due to the presence of [C 16 mim][Br] at the PVDF/MWCNT interface. Furthermore, the data well fitted in the model with significant linearity. The positive effect on the crystallization of PVDF may be ascribed to not only due to the existence of -cation interaction between the imidazolium cation and the aromatic multiwall carbon nanotubes structure, but also due to the electrostatic interaction between the > CF 2 of the polymer backbone and imidazolium cation, which speed up the crystallization kinetics.

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Ionic liquid modified poly(vinylidene fluoride): crystalline structures, miscibility, and physical properties

Cited by 192 publications

References 54 publications

Understanding of Versatile and Tunable Nanostructuration of Ionic Liquids on Fluorinated Copolymer

Understanding of Versatile and Tunable Nanostructuration of Ionic Liquids on Fluorinated Copolymer

Effect of ionic liquid anion and cation on the physico-chemical properties of poly(vinylidene fluoride)/ionic liquid blends

Crystallization kinetics of PVDF filled with multi wall carbon nanotubes modified by amphiphilic ionic liquid

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