Mechanical properties of electrospun PMMA micro-yarns: Effects of NaCl mediation and yarn twist

Sui, XiaoMeng; Wiesel, E.; Wagner, H. Daniel

doi:10.1016/j.polymer.2012.08.062

Cited by 17 publications

(18 citation statements)

References 31 publications

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“…A number of authors (for example, Calard and Lamond [42]) have proposed to infer the strength of individual filaments from the testing of yarns, which seems to be advantageous since a single test provides the properties of all the fibers in the yarn, as well as the properties of the yarn itself. Models exist [29][30][31][32][33]42], and can be verified, for the relationships between the tensile strengths of the yarn and of the single filaments, as well as between the degrees of scatter of the yarn and the filaments.…”

Section: Further Discussion Of the Strength And Toughness Of Individumentioning

confidence: 99%

“…It corresponds to theoretical predictions from classical bundle theory, namely that (i) the mean strength of a bundle is always lower than the mean strength of a single fiber, and (ii) as the number of fibers in the yarn increases, the mean strength of the bundle decreases (the bundle weakens as the number of fibers increases). Semi-empirical models [28][29][30][31] as well as stochastic arguments [32,33] have been presented in the past to justify this behavior. Note also from Fig.…”

Section: Parametermentioning

confidence: 99%

“…6c the Young's modulus of the yarns is shown to decrease exponentially as the number of filaments increases, for the two yarn configurations. This statistically significant trend appears to be more difficult to justify theoretically since existing semi-empirical models [28][29][30][31] for the yarn over filament modulus ratio do not include a direct dependence on the yarn size (mainly the effect of twist on modulus is analyzed in the literature, and no experimental data for the role of yarn size seem to exist).…”

Section: Parametermentioning

confidence: 99%

“…It is however likely that twist-related effects could exist at other angles, as observed for example for the strength and the modulus of various polymer fibers [28][29][30][31][32][33]. This will be studied in future work.…”

Section: Parametermentioning

confidence: 99%

“…Although the effects of yarn twist remain debatable, its application does result in a more intimate interaction between fibers than in a loose yarn made of parallel fibers. This, of course (as well as the filament length which is not considered here) influences the strength and modulus of a yarn, as well as the strength variability [31][32][33]. Various theoretical models of Young's modulus and strength of twisted yarns have recently been reviewed by Sui et al [30].…”

Section: Introductionmentioning

confidence: 99%

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Section: Further Discussion Of the Strength And Toughness Of Individumentioning

confidence: 99%

Section: Parametermentioning

confidence: 99%

Section: Parametermentioning

confidence: 99%

Section: Parametermentioning

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One major challenge of functional material fabrication is combining flexibility, strength, and toughness. In several biological and artificial systems, these desired mechanical properties are achieved by hierarchical architectures and various forms of anisotropy, as found in bones and nacre. Here, it is reported that crystals of N-capped diphenylalanine, one of the most studied self-assembling systems in nanotechnology, exhibit well-ordered packing and diffraction of sub-Å resolution, yet display an exceptionally flexible nature. To explore this flexibility, the mechanical properties of individual crystals are evaluated, assisted by density functional theory calculations. High-resolution scanning electron microscopy reveals that the crystals are composed of layered self-assembled structures. The observed combination of strength, toughness, and flexibility can therefore be explained in terms of weak interactions between rigid layers. These crystals represent a novel class of self-assembled layered materials, which can be utilized for various technological applications, where a combination of usually contradictory mechanical properties is desired.

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Polymeric Fibers with High Strength and High Toughness at Extreme Temperatures

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Developing strong and simultaneously tough polymeric materials with excellent thermal stability and mechanical performance even under extreme temperatures is truly a challenge. In a disruptive progress, continuous polymeric yarns are developed with a combination of high tensile strength of (1145 ± 44) MPa and ultrahigh toughness of (350 ± 24) J g−1 and high thermomechanical properties from −196 to 200 °C. The comprehensive thermomechanical performance of this yarn surpasses that of previously developed polymeric materials and dragline spider silks. The results demonstrate that the molecular structure of polyimide (PI) with the incorporation of flexible‐rigid macromolecular, hierarchically spiral‐oriented fibers, and high glass transition temperature (248 °C) are keys for the yarn's notable comprehensive performance in thermomechanical properties. The materials are ideal for technical components exposed to high thermomechanical loadings, such as those encountered in spacecraft or automotive engineering for safety‐critical applications.

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Mechanical properties of electrospun PMMA micro-yarns: Effects of NaCl mediation and yarn twist

Cited by 17 publications

References 31 publications

Gelatin yarns inspired by tendons — Structural and mechanical perspectives

Gelatin yarns inspired by tendons — Structural and mechanical perspectives

Bioinspired Flexible and Tough Layered Peptide Crystals

Polymeric Fibers with High Strength and High Toughness at Extreme Temperatures

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