Effect of ionic liquid on the crystallization kinetics behaviour of polymer poly(ethylene oxide)

Chaurasia, Sujeet Kumar; Singh, Rajendra Kumar; Chandra, Suresh

doi:10.1039/c3ce40576a

Cited by 30 publications

(34 citation statements)

References 52 publications

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“…Interestingly, the model is able to reproduce the thermograms obtained at high and low cooling rates with the same set of model parameters, but the value of the Avrami exponent m is ∼2.5, significantly lower than the exponent n obtained from the isothermal scans. This fact was also encountered in other works fitting nonisothermal crystallization thermograms with Ozawa‐Avrami or modified Avrami model . Deviation at low cooling rates and at low temperatures (high conversions) can be observed in 50/50 blend [Fig.…”

Section: Resultssupporting

confidence: 71%

“…The results found in the literature cover the range between 1 and 4.5. It seems that very low values are found for high‐molecular‐weight polymers, other authors report values below 2.5, while values above 3 were found in other refs. , and .…”

Section: Resultsmentioning

confidence: 76%

“…The treatment of these kinds of results with crystallization models is conceptually complex. The model of Ozawa has been used in to describe the nonisothermal crystallization of PEO . The Avrami model has been applied to crystallization on cooling by a conversion of the temperature to time scales .…”

Section: Resultsmentioning

confidence: 99%

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Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

Tamaño-Machiavello

Costa

Romero‐Colomer

et al. 2017

J Polym Sci B Polym Phys

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Polymer blends based on poly(vinylidene fluoride) (PVDF) and poly(ethylene oxide) (PEO) have been prepared to analyze the crystallization kinetics of poly(ethylene oxide) confined in semicrystalline PVDF with different ratios of both polymers. Both blend components were dissolved in a common solvent, dimethyl formamide. Blend films were obtained by casting from the solution at 70 8C. Thus, PVDF crystals are formed by crystallization from the solution while PEO (which is in the liquid state during the whole process) is confined between PVDF crystallites. The kinetics of crystallization of the confined PEO phase was studied by isothermal and nonisothermal experiments. Fitting of Avrami model to the experimental DSC traces allows a quantitative comparison of the influence of the PVDF/PEO ratio in the blend on the crystallization behavior. The effect of melting and further recrystallization of the PVDF matrix on PEO confinement is also studied.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 76%

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Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

Tamaño-Machiavello

Costa

Romero‐Colomer

et al. 2017

J Polym Sci B Polym Phys

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“…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. 17 The impact of ionic liquid [BMIM][PF 6 ] on the isothermal and nonisothermal crystallization kinetics of polymer poly(ethylene oxide) (PEO) was studied by S. Chandra et al 18 and narrated that incorporation of IL slow down both isothermal and nonisothermal crystallization. However, there are few reports about the influence of IL containing long alkyl chain on the modification of MWCNT and its subsequent use for the crystallization of polymer.…”

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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“…They found that pyrrolidinium ILs could serve as effective nucleating agents in accelerating the crystallization of poly(ethylene terephthalate). However, after studying the effect of ILs on the crystallization kinetics behavior of poly(ethylene oxide) (PEO), Chaurasia et al . infer a completely opposite conclusion.…”

Section: Introductionmentioning

confidence: 99%

Effect of the ionic liquid [bmim]PF₆ on the nonisothermal crystallization kinetics behavior of poly(ether‐b‐amide)

Bai

Wang

Zhang

et al. 2015

J of Applied Polymer Sci

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Blending ionic liquid with crystalline polymer permits the design of new high-performance composite materials. The final properties of these materials are critically depended on the degree of crystallinity and the nature of crystalline morphology. In this work, nonisothermal crystallization behavior of poly(ether-b-amide) (PebaxV R 1657)/room temperature ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate, [bmim]PF 6 ) was investigated by differential scanning calorimetry. The presence of [bmim]PF 6 can retard the nucleation of PebaxV R 1657 and lead to the crystallization depression of the PA block and the crystalline disappearance of the PEO block. However, the dilution effect of the IL results in a higher growth rate of crystallization of PA block. The influence of [bmim]PF 6 content and cooling rate on crystallization mechanism and spherulitc structures was determined by the Avrami equation modified by Jeziorny and Mo's methods, whereas the Ozawa's approach fails to describe the nonisothermal crystallization behavior of PebaxV R 1657/[bmim]PF 6 blends. In the modified Avrami analysis, the Avrami exponent of PA blocks, n > 3, for pure PebaxV R 1657, while 3 > n > 2 for PebaxV R 1657/[bmim]PF 6 blends testifies the transformation of crystallization growth pattern induced by [bmim]PF 6 from three-dimensional growth of spherulites to a combination of two-and three-dimensional spherulitic growth. Further, lower activation energy for the nonisothermal crystallization of PA blocks of PebaxV R 1657 can be observed with the increase of [bmim]PF 6 content.

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Effect of ionic liquid on the crystallization kinetics behaviour of polymer poly(ethylene oxide)

Cited by 30 publications

References 52 publications

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

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

Effect of the ionic liquid [bmim]PF₆ on the nonisothermal crystallization kinetics behavior of poly(ether‐b‐amide)

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Effect of ionic liquid on the crystallization kinetics behaviour of polymer poly(ethylene oxide)

Cited by 30 publications

References 52 publications

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

Crystallization kinetics of poly(ethylene oxide) confined in semicrystalline poly(vinylidene) fluoride

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

Effect of the ionic liquid [bmim]PF6 on the nonisothermal crystallization kinetics behavior of poly(ether‐b‐amide)

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Effect of the ionic liquid [bmim]PF₆ on the nonisothermal crystallization kinetics behavior of poly(ether‐b‐amide)