Crystallization kinetics of γ phase poly(vinylidene fluoride)(PVDF) induecd by tetrabutylammonium bisulfate

Liang, Chenglu; Mai, Zhong-Hai; Xie, Qingguo; Bao, Rui‐Ying; Yang, Wei; Xie, Bin; Yang, Ming‐Bo

doi:10.1007/s10965-014-0616-z

Cited by 8 publications

(8 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The β phase of PVDF‐HFP always appears in the ionogels with different EMIM:DCA loadings as shown in Figure b. Similar change was also reported when a salt like including tetrabutylammonium bisulfate, tetraphenylphosphonium bromide or CaF 2 into PVDF films . They ascribed the appearance of the β phase to the interaction between the ions and the dipole moment of the polymer as the β phase has high dipole moment.…”

Section: Discussionsupporting

confidence: 74%

“…[11] The solvent screening is weak when the solvent is less polar. [43][44][45] They ascribed the appearance of the β phase to the interaction between the ions and the dipole moment of the polymer as the β phase has high dipole moment. [12] This can account for the high Seebeck coefficient (11 mV K −1 ) of PEO solution of NaOH at the absence of water as well.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Cheng

Fan

et al. 2019

Advanced Energy Materials

229

269

View full text Add to dashboard Cite

Thermoelectric materials can be used to harvest low‐grade heat that is otherwise dissipated to the environment. But the conventional thermoelectric materials that are semiconductors or semimetals, usually exhibit a Seebeck coefficient of much less than 1 mV K−1. They are expensive and consist of toxic elements as well. Here, it is demonstrated environmental benign flexible quasi‐solid state ionogels with giant Seebeck coefficient and ultrahigh thermoelectric properties. The ionogels made of ionic liquids and poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) can exhibit a giant Seebeck coefficient up to 26.1 mV K−1, the highest for electronic and ionic conductors. In addition, they have a high ionic conductivity of 6.7 mS cm−1 and a low thermal conductivity of 0.176 W m−1 K−1. Their thermoelectric figure of merit (ZT) is thus 0.75. The giant Seebeck coefficient is related to the ion‐dipole interaction between PVDF‐HFP and ionic liquids. Their application in ionic thermoelectric capacitors is also demonstrated for the conversion of intermittent heat into electricity. They are especially important to harvest the low‐grade thermal energy that is abundant on earth.

show abstract

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Cheng

Fan

et al. 2019

Advanced Energy Materials

229

269

View full text Add to dashboard Cite

show abstract

“…5, it is found that the higher the cooling rate, the shorter the time of crystallization completion which is similar to previous non-isothermal crystallization studies [40]. Avrami's method is widely used to study the crystallinity under isothermal conditions [41][42][43][44][45]. The Avrami equation is expressed as…”

Section: Non-isothermal Crystallization Kineticssupporting

confidence: 75%

Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends

Wang

Chen

2016

J Therm Anal Calorim

View full text Add to dashboard Cite

In this study, blends of poly(vinylidene fluoride) and different contents of poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer (BCP) (PMMA-b-P2VP) are prepared by solution mixing. The phase separation and crystallization behaviors of PVDF and PMMA-b-P2VP blends were characterized by X-ray scattering from small angle to wide angle at different annealing temperatures. The non-isothermal crystallization kinetics of the blends is investigated by differential scanning calorimetry (DSC). During the non-isothermal cooling process, PVDF in blends has higher onset crystallization temperature than that of pure PVDF, which may be attributed to a weak phase separation seen from X-ray scattering patterns, in favor of the nucleation of PVDF. A unique crystallization behavior in DSC test is that as the PVDF content in the blends is dispersed as 30 mass%, degree of crystallinity turns out to be the highest among the blends, even higher than PVDF itself, although the crystallization rate is decreasing with the BCP content. By a novel treatment of dividing the X t * t plot to three stages, it can be found that the relative degree of crystallinity at the end of nucleation process can be responsible for the unusual crystallization behavior. Incorporation of BCP definitely increases the hydrophilic property of PVDF materials by water contact angle test. Understanding of PVDF crystallization in the system with BCP guides the further development of high-performance PVDF membrane materials.

show abstract

“…On the other hand, ionic salts are able to accelerate the crystallization of c-phase crystallites. c-phase crystallites were obtained by isothermal crystallization at a high temperature of 165 °C by adding KBr powders [29], and the crystallization time of c-phase crystallites was drastically shortened by adding ammonium salts [36,40].…”

Section: Introductionmentioning

confidence: 99%

“…However, the effect of the chemical structure of alkylammonium salts such as the length of the alkyl chain and the size of anion species, has not been clarified. Most of the crystallization kinetic studies of PVDF in the presence of onium salt were carried out using DSC [40], in which spherulite size is not estimated, though nucleation agents also affect the spherulite size. In this study, we investigated the crystallization kinetics and crystalline structure of PVDF added with a series of alkylammonium salt consisting of various lengths of alkyl chain and various sizes of anion species.…”

Section: Introductionmentioning

confidence: 99%

Nucleation Effect of the Chemical Structure of Alkylammonium Salt on the Crystallization Behavior of Poly(Vinylidene Fluoride)

Miyashita

Saito

2022

Polymer Crystallization

View full text Add to dashboard Cite

We investigated the effect of the chemical structure of alkylammonium salt on the crystallization behavior of poly(vinylidene fluoride) (PVDF) by DSC, optical microscopy, light scattering, and FT-IR. The nonisothermal and isothermal crystallizations of PVDF were accelerated by adding alkylammonium salt consisting of short alkyl chains and small anion species, and the spherulite size and the ordering in the spherulite became smaller due to the nucleation agent effect. The FT-IR spectra revealed that electroactive γ-phase was preferentially formed by adding alkylammonium salts though the accelerated crystallization was suppressed due to the steric hindrance effect by the long alkyl chain and large anion species. On the other hand, the formation of the γ-phase was suppressed when the dispersion of the salt in the PVDF matrix was poor due to the high melting temperature.

show abstract

Crystallization kinetics of γ phase poly(vinylidene fluoride)(PVDF) induecd by tetrabutylammonium bisulfate

Cited by 8 publications

References 42 publications

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends

Nucleation Effect of the Chemical Structure of Alkylammonium Salt on the Crystallization Behavior of Poly(Vinylidene Fluoride)

Contact Info

Product

Resources

About