Relation between fiber orientation and mechanical properties of nano-engineered poly(vinylidene fluoride) electrospun composite fiber mats

Maciel, Marta M.; Ribeiro, Sylvie; Ribeiro, Clarisse; Francesko, António; Maceiras, Alberto; Vilas, José Luis; Lanceros‐Méndez, S.

doi:10.1016/j.compositesb.2017.11.065

Cited by 68 publications

(66 citation statements)

References 60 publications

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“…The inclusion of CFO nanoparticles induces a decrease of the degree of crystallinity for films and for random fibers, which indicates the CFO nanoparticles act as defects during the crystallization process [34], also hindering spherulite growth [35]. Interestingly, the same behavior is not observed for aligned fibers, where a slight increase is observed (~9%), contrary to the observed in the literature with different polymers [34,36], which can be ascribed to the polymer stretching and acceleration during the jet formation. The increase in the crystallinity degree observed for oriented fibers composites can be attributed to variations in the stretching of the jet during the electrospinning process, due to the modifications of the viscosity and electrical characteristics of the solution.…”

Section: Resultsmentioning

confidence: 92%

Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications

Amaro

Correia

Marques‐Almeida

et al. 2018

IJMS

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Polymer-based piezoelectric biomaterials have already proven their relevance for tissue engineering applications. Furthermore, the morphology of the scaffolds plays also an important role in cell proliferation and differentiation. The present work reports on poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), a biocompatible, biodegradable, and piezoelectric biopolymer that has been processed in different morphologies, including films, fibers, microspheres, and 3D scaffolds. The corresponding magnetically active PHBV-based composites were also produced. The effect of the morphology on physico-chemical, thermal, magnetic, and mechanical properties of pristine and composite samples was evaluated, as well as their cytotoxicity. It was observed that the morphology does not strongly affect the properties of the pristine samples but the introduction of cobalt ferrites induces changes in the degree of crystallinity that could affect the applicability of prepared biomaterials. Young’s modulus is dependent of the morphology and also increases with the addition of cobalt ferrites. Both pristine and PHBV/cobalt ferrite composite samples are not cytotoxic, indicating their suitability for tissue engineering applications.

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Section: Resultsmentioning

confidence: 92%

Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications

Amaro

Correia

Marques‐Almeida

et al. 2018

IJMS

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“…This alignment of electrospun fibers is also commonly studied in the literature. Randomly oriented fibers can be easily fabricated using stationary collectors, whereas highly aligned fibers can be fabricated using high‐speed rotating collectors . Nonetheless, tedious parameters optimization may be needed to spin highly aligned fibers with high‐speed rotating collectors as the splaying and whipping instability of the solution jet during electrospinning will hinder the alignment of the fibers as stated by Kiselev et al .…”

Section: Introductionmentioning

confidence: 99%

Design of polyurethane fibers: Relation between the spinning technique and the resulting fiber topology

Joo

Lee

Ang

et al. 2019

J of Applied Polymer Sci

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Properties or characteristics of fibers are affected by their topology. In fact, these topologies are found to have significant impacts in the functionalities of many applications. Hence, in this study, the relations between the spinning techniques and the topology of the resulting fibers are studied with the aim to provide a guideline for future reference where fibers with certain topology can be fabricated to suit specific applications. For this purpose, polyurethane is chosen to be the raw material to fabricate the fibers due to its versatility to be applied in various fields. The surface morphology, structures, and alignments of the fibers are studied. It is found that the polymer solution properties largely influence the mechanisms in the spinning process and can significantly affect the topology of the fibers. For instance, viscous solutions enable the spinning of coiled and smooth fibers, whereas conductive solutions encourage the splaying of the solution jet which results in the spinning of straight fibers.

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“…It has been shown that fiber alignment increases with drum angular speed (RPM) during electrospinning, and tensile properties correlate with alignment because morphology is more uniform and stresses can more easily distribute over all fibers . As a result, once relative humidity was controlled and continuous fibers could be consistently formed, the effects of drum speed were explored via mat tension tests to facilitate choosing a rotation speed for optimal fiber synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…To maximize strength and stiffness, aligned mats spun from higher RPM spinning are desirable, although too high (2000 RPM) was found to lead to mat quality challenges. Although the strength and stiffness of mats spun at 1000 RPM and 1500 RPM were similar, 1500 RPM was utilized going forward given that the coherency values were higher and prior literature suggests mechanical properties improvements with higher alignment due to more uniform morphology and denser lateral packing . Morphology of mats spun at 1500 RPM was further characterized to quantify fiber diameter and distribution thereof.…”

Section: Resultsmentioning

confidence: 99%

“…Tensile testing of these mats revealed that annealing alone had no measurable effect on mat tensile properties, whereas annealing under applied tension led to increases in both modulus and strength of the mats. The applied tension causes the fibers to reorient along the direction of applied strain, thus increasing the number of fibers available for distribution of stresses. A summary of the results from the areal density and post‐processing experiments is reported in Table .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and mechanical properties of para‐aramid nanofibers

Trexler

Hoffman

Smith

et al. 2019

J Polym Sci B Polym Phys

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Scalable, bottom‐up chemical synthesis and electrospinning of novel Cl‐substituted poly(para‐phenylene terephthalamide) (PPTA) nanofibers are herein reported. To achieve Cl‐PPTA nanofibers, the chemical reaction between the monomers was precisely controlled, and dissolution of the polymer into solvent was tailored to enable anisotropic solution formation and sufficient entanglement molecular weight. Electrospinning processing parameters were studied to understand their effects on fiber formation and mat morphology and then optimized to yield consistently high quality fibers. Importantly, the control of relative humidity during the fiber formation process was found to be critical, likely because water promotes hydrogen bond formation between the PPTA chains. The fiber and mat morphologies resulting from different combinations of chemistry and spinning conditions were observed using scanning electron microscopy, and observations were used as inputs to the optimization process. Tensile properties of single Cl‐PPTA nanofibers were characterized for the first time using a nanomanipulator mounted inside a scanning electron microscope (SEM), and fiber moduli measuring up to 70 GPa, and strengths exceeding 1 GPa were achieved. Given the excellent mechanical properties measured for the nanofibers, this chemical synthesis procedure and electrospinning protocol appear to be a promising route for producing a new class of nanofibers with ultrahigh strength and stiffness. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 563–573

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Relation between fiber orientation and mechanical properties of nano-engineered poly(vinylidene fluoride) electrospun composite fiber mats

Cited by 68 publications

References 60 publications

Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications

Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications

Design of polyurethane fibers: Relation between the spinning technique and the resulting fiber topology

Synthesis and mechanical properties of para‐aramid nanofibers

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