Crystal polymorphism in electrospun composite nanofibers of poly(vinylidene fluoride) with nanoclay

Lei, Yu; Cebe, Peggy

doi:10.1016/j.polymer.2009.03.003

Cited by 204 publications

(169 citation statements)

References 34 publications

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“…The conformations of chains in these phases are TGTG', TGTG', TTT, T 3 GT 3 G' and T 3 GT 3 G', respectively, which T and G stands for Trans and Gauche conformations [3,76]. Among these phases, α, β and γ are the most studied and discussed in scientific and applied researches [3,76,77].…”

Section: Electrospinning Of Pvdf At Humid Environmentmentioning

confidence: 99%

“…WAXD patterns of all fibers and webs ( Figure 8) except one produced from PVDF/NMP solution at RH: 20 % show three distinct peaks at 2θ around 18.6, 20.3 and 27.1 o which correspond to, respectively, α (020), β ( (200) (110)) and α (111) reflections of PVDF crystallites [3,76,77]. As obvious, when DMF is employed as solvent, the intensity of β phase increases with RH up to 40 % above which β-phase intensity exhibits an descending order with RH.…”

Section: Electrospinning Of Pvdf At Humid Environmentmentioning

confidence: 99%

“…Today polymeric nanofibers have drawn great attention because of their potential applications in a wide range of scientific and commercial areas such as filtration [1], piezoelectric nano-composites [2,3], tissue engineering [4], elaborating surface hydrophobicity and wetting processes [5,6], membranes in sensing materials [7], catalytic systems [8], protective clothing [9], cleanup the oil contaminations [10,11], three-dimensional nanofibrous macrostructures [12] and sportswear, activewear and workwear [13].…”

Section: Introductionmentioning

confidence: 99%

“…This has been the subject of many scientific researches focusing on controlling morphology of poly(vinylidene fluoride) (PVDF) membranes and films [52][53][54]. Nowadays, PVDF is the polymer of choice for a variety of scientific and commercial researches because of its favorable properties including flexibility, thermal stability, high mechanical strength and chemical resistance as well as diversity of PVDF potential applications as membrane, piezoelectric and pyroelectric materials in the form of films or electrospun fibers [2,3,55], porous nanofibers [56,57], core-shell nanofibers [58,59] and protection of brittle paper relics from environmental damage [60].…”

Section: Introductionmentioning

confidence: 99%

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Interplay of liquid-liquid and solid-liquid phase separation mechanisms in porosity and polymorphism evolution within poly(vinylidene fluoride) nanofibers

2015

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Porosity and polymorphism evolution within poly(vinylidene fluoride) (PVDF) nanofibers is discussed in relation to interplay of liquid-liquid (L-L) and solid-liquid (S-L) phase separation mechanisms. To this end, poly(vinylidene fluoride) (PVDF) solutions composed of nonvolatile solvents, dimethylformamide (DMF) and N-methylpyrrolidone (NMP), are subjected to electrospinning under environmental conditions of constant temperature (T=20 o C) and different levels of relative humidity (RH) ranging from 20 to 80 %. It is demonstrated that bead appearance, fiber diameter, porosity formation and polymorphism evolution is strongly affected by L-L phase inversion. Increasing RH as well as size of L-L miscibility gap in the ternary phase diagram of nonsolvent (water)/solvent (DMF or NMP)/polymer (PVDF) reduces time required to induce L-L demixing as verified by calculated mass transfer pathways. Therefore, bead-free fibers of larger diameters are expected, meanwhile, growth of β-phase crystals is suppressed. This is why fibers electrospun from DMF-based solution contain less β-phase crystals at high values of RH. In contrast, for solutions composed of NMP, jet stretching due to whipping instability plays pivotal role to form fiber structure as a result of delayed L-L demixing with respect to S-L demixing at high RH, 80 %. Furthermore, retarded L-L demixing in NMP-based systems destabilizes fiber formation at low humid environment which can be enhanced by addition a volatile solvent such as acetone. Additionally, more evidence for increment of β-phase formation with increasing working distance (w.d.) at constant RH is provided.

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Section: Electrospinning Of Pvdf At Humid Environmentmentioning

confidence: 99%

Section: Electrospinning Of Pvdf At Humid Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interplay of liquid-liquid and solid-liquid phase separation mechanisms in porosity and polymorphism evolution within poly(vinylidene fluoride) nanofibers

2015

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“…Poly(Methyl Methacrylate) (PMMA) is a common synthetic organic polymer traditionally used in various industrial applications [5]. Besides, clay particles have been shown to be easily electrospun with different polymers such as nylon 66, poly(viny alcohol) or poly(vinylidene fluoride) for various applications [6][7][8][9][10]. Addition of clays into polymer solutions increased the extensional viscosity, the extent of strain hardening and thus the electrospinnability of the resulting polymer/clay dispersions.…”

Section: Introductionmentioning

confidence: 99%

Surface Morphology and Modulus, Wetting Behavior and Photocatalytic Activity of the TiO<sub>2</sub> Coated Materials Based on PMMA/O-MMT Composite Microfibers

Wang

Li²,

Wei

et al. 2011

JFBI

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Poly(Methyl Methacrylate) PMMA/Organically Modified Montmorillonite (O-MMT) composite microfibers membrane coated with TiO 2 has significant advantages in cationic dyes adsorption and can break down the adsorbed dyes under UV radiation, which is quite useful in water treatment. In this work, PMMA/O-MMT composite microfibers were firstly prepared by emulsion polymerization combined with electrospinning, and then coated by nanosize TiO 2 using RF magnetron sputtering. The effects of TiO 2 sputter coating on morphology and surface modulus was characterized by Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM), while the wetting behaviour was studied by drop shape analyzer. The photocatalytic degradation of methylene blue was tested under UV radiation and the properties of the treated and untreated samples were compared. It was observed from SEM images that TiO 2 was well dispersed and deposited on the surface of PMMA/O-MMT microfibers, while the AFM results showed increase in the surface modulus after TiO 2 coating. Besides, the wettability of the microfibers membrane coated with TiO 2 was altered, which facilitated water treatment in practical use. Furthermore, the PMMA/O-MMT microfibers membrane coated with TiO 2 performed well in photocatalytic degradation of methylene blue. In conclusion, PMMA/O-MMT composite microfibers membrane coated with TiO 2 was quite promising in water treatment.

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Design and Fabrication of Electrospun PVDF Piezo‐Energy Harvesters

Pan

Hwang

Liu

et al. 2014

Design and Fabrication of Self‐Powered Micro‐Harvesters

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Crystal polymorphism in electrospun composite nanofibers of poly(vinylidene fluoride) with nanoclay

Cited by 204 publications

References 34 publications

Interplay of liquid-liquid and solid-liquid phase separation mechanisms in porosity and polymorphism evolution within poly(vinylidene fluoride) nanofibers

Interplay of liquid-liquid and solid-liquid phase separation mechanisms in porosity and polymorphism evolution within poly(vinylidene fluoride) nanofibers

Surface Morphology and Modulus, Wetting Behavior and Photocatalytic Activity of the TiO<sub>2</sub> Coated Materials Based on PMMA/O-MMT Composite Microfibers

Design and Fabrication of Electrospun PVDF Piezo‐Energy Harvesters

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