A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

Cai, Xiaomei; Lei, Tingping; Sun, Di; Liu, Lin

doi:10.1039/c7ra01267e

Cited by 989 publications

(854 citation statements)

References 115 publications

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“…The weaker peak appearing near 2θ = 35° in the aligned fibers corresponds to the (001) reflection of the β phase, and is not observed in the randomly oriented fibers. Lastly, a peak at 2θ = 41°, corresponding to (111) reflections of the ɑ phase appears in both the randomly oriented and aligned fibers . As expected inclusion of TrFE copolymer shifted the β peaks to the left .…”

Section: Resultssupporting

confidence: 59%

Electrospun Fibrous PVDF‐TrFe Scaffolds for Cardiac Tissue Engineering, Differentiation, and Maturation

Adadi

Yadid

Gal

et al. 2020

Adv Materials Technologies

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Cardiac tissue engineering aims to create cardiac tissue constructs that recapitulate the structure and function of the native heart. This approach has been widely used for creating myocardial implants for regenerative medicine, and more recently, for developing in vitro cardiotoxicity screening assays. However, once the engineered myocardial tissues are implanted or subjected to pharmacological stimuli, their performance should be monitored. Currently, there is no biomaterial that promotes functional tissues assembly while providing real‐time information about their function, in situ. In this study, the piezoelectric phenomenon is sought to be exploited, to measure the contractions generated by engineered cardiac tissues. A poly‐(vinylidene fluoride) (PVDF)‐based electrospun fiber scaffold is developed, and it is hypothesized that the contractions of cardiomyocytes in the scaffold will induce mechanical deformations, which will result in measurable electric voltage. The PVDF scaffolds are characterized and optimized for supporting formation of aligned, functional, cardiac tissues. The scaffolds' function is then validated as sensors for tissue contraction and it is demonstrated that they can sense contractions of tissues constructed from as few as 5 × 105 cardiomyocytes. Furthermore, it is demonstrated that human induced pluripotent stem cells can be directly seeded and differentiated to cardiomyocytes, and then mature over the course of 40 days on the PVDF fiber scaffolds.

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Section: Resultssupporting

confidence: 59%

Electrospun Fibrous PVDF‐TrFe Scaffolds for Cardiac Tissue Engineering, Differentiation, and Maturation

Adadi

Yadid

Gal

et al. 2020

Adv Materials Technologies

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“…Melt crystallization of the blends results in greater crystallinity than seen in as‐spun fibers. Figure S1 of the supporting information shows via infrared spectroscopy that the α crystallographic phase is favored when crystallizing PVDF from the melt …”

Section: Resultsmentioning

confidence: 99%

Electrospun fiber membranes from blends of poly(vinylidene fluoride) with fouling‐resistant zwitterionic copolymers

Govinna

Kaner

Ceasar

et al. 2018

Polymer International

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Nonwoven super‐hydrophobic fiber membranes have potential applications in oil–water separation and membrane distillation, but fouling negatively impacts both applications. Membranes were prepared from blends comprising poly(vinylidene fluoride) (PVDF) and random zwitterionic copolymers of poly(methyl methacrylate) (PMMA) with sulfobetaine methacrylate (SBMA) or with sulfobetaine‐2‐vinylpyridine (SB2VP). PVDF imparts mechanical strength to the membrane, while the copolymers enhance fouling resistance. Blend composition was varied by controlling the PVDF‐to‐copolymer ratio. Nonwoven fiber membranes were obtained by electrospinning solutions of PVDF and the copolymers in a mixed solvent of N,N‐dimethylacetamide and acetone. The PVDF crystal phases and crystallinities of the blends were studied using wide‐angle X‐ray diffraction and differential scanning calorimetry (DSC). PVDF crystallized preferentially into its polar β‐phase, though its degree of crystallinity was reduced with increased addition of the random copolymers. Thermogravimetry (TG) showed that the degradation temperatures varied systematically with blend composition. PVDF blends with either copolymer showed significant increase of fouling resistance. Membranes prepared from blends containing 10% P(MMA‐ran‐SB2VP) had the highest fouling resistance, with a fivefold decrease in protein adsorption on the surface, compared to homopolymer PVDF. They also exhibited higher pure water flux, and better oil removal in oil–water separation experiments. © 2018 Society of Chemical Industry

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“…11-13 a Authors to whom correspondence should be addressed: tplei@hqu.edu.cn and cxplum@163.com Electrospinning is a powerful technique for the production of nano/micro scale fibers that have attracted great interest from both academia and industry, because of their unique capacity in solving global issues. 14 Based on past experience on investigations of electrospinning and PVDF polymer, [15][16][17] we demonstrate here for the first time a single-step process to facilely transform candle soots into nanoporous fibers via electrospinning of cocktail of PVDF and candle soots. The specific wettability (hydrophobicity/oleophilicity) of the fibrous membrane is investigated and the superhydrophobic and superoleophilic properties of the membrane are recorded.…”

Section: Introductionmentioning

confidence: 99%

Facile transformation of soot nanoparticles into nanoporous fibers via single-step electrospinning

et al. 2017

Self Cite

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A facile technique to transform candle soots into nanoporous fibers via electrospinning of mixed solution of candle soots and polyvinylidene fluoride (PVDF) has been demonstrated for the first time. Due to insolubility of soot nanoparticles and good solubility of PVDF polymer in DMF/acetone solvents, the soot molecules are heterogeneously dispersed in the mixed solutions. The selection of an appropriate polymer concentration resulted in a good dispersion of the low-density soot nanoparticles which can be held for electrospinning. The electrospinning experiment shows that soot nanoparticles can be smoothly bonded with PVDF molecules to form nanoporous fibers. The unique superhydrophobic and superoleophilic properties of the as-prepared electrospun fibrous membrane were demonstrated by subjecting it to various aqueous liquids and oils. This work provides a simple way to transform low-density nanoparticles into high-performance nanoporous nanofibers, which should broaden the applications of electrospinning.

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A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

Abstract: A universal but simple procedure for identifying the α, β and γ phases in PVDF using FTIR is proposed and validated. An integrated quantification methodology for individual β and γ phase in mixed systems is also proposed.

Cited by 989 publications

References 115 publications

Electrospun Fibrous PVDF‐TrFe Scaffolds for Cardiac Tissue Engineering, Differentiation, and Maturation

Electrospun Fibrous PVDF‐TrFe Scaffolds for Cardiac Tissue Engineering, Differentiation, and Maturation

Electrospun fiber membranes from blends of poly(vinylidene fluoride) with fouling‐resistant zwitterionic copolymers

Facile transformation of soot nanoparticles into nanoporous fibers via single-step electrospinning

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