The model of polymer orientation strengthening and production of ultra-high strength fibers

Savitsky, A. V.; Горшкова, И. А.; Frolova, I.L.; Shmikk, G. N.; Ioffe, A. F.

doi:10.1007/bf00275968

Cited by 21 publications

(15 citation statements)

References 2 publications

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“…These findings are in accordance with the earlier studies on solution-spun fibres obtained after dissolution of the polymer, reported by Savitsky et 13 al. [16]. These authors also showed that the tensile modulus reaches a plateau above the draw ratio of 100.…”

Section: Influence Of Molar Mass On Tensile Strength and Modulusmentioning

confidence: 90%

Solvent-Free Solid-State-Processed Tapes of Ultrahigh-Molecular-Weight Polyethylene: Influence of Molar Mass and Molar Mass Distribution on the Tensile Properties

Ronca

Forte

Tjaden

et al. 2015

Ind. Eng. Chem. Res.

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In normal practice, ease in processing comes at the expense of a reduction in mechanical properties. Here we show that by controlled synthesis it is possible to synthesize a wide range of linear ultrahigh-molecular-weight polyethylenes that can be stretched uniaxially into tapes. In these uniaxially drawn tapes, the bundles of fibers align themselves in a preferred crystal plane orientation, accounting for an extraordinarily high tensile modulus. The stretching process is accomplished in the solid state with no need for any solvent. The ease of solid-state processing provides a unique opportunity to follow the influence of the molar mass on the tensile properties. The uniaxially drawn tapes, similar to the fibers spun from solvent, confirm the empirical relationship between tensile strength and tensile modulus proposed by van Krevelen in 1976 and subsequently supported by experimental findings on solution-spun fibers by Smith and Lemstra. However, the solid-state-processed tapes do not achieve the high values of tensile strength expected from this relationship, where a modulus of 200 GPa would correspond to a tensile strength of 5 GPa. The relatively lower tensile strength of 4 GPa for the extraordinarily high modulus of 200 GPa observed in the uniaxially stretched tapes is attributed to the presence of defects, as tapes can be considered composites of fibers. The high modulus in combination with the tensile strength in tapes has the potential to provide unique physical properties in composites.

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Section: Influence Of Molar Mass On Tensile Strength and Modulusmentioning

confidence: 90%

Solvent-Free Solid-State-Processed Tapes of Ultrahigh-Molecular-Weight Polyethylene: Influence of Molar Mass and Molar Mass Distribution on the Tensile Properties

Ronca

Forte

Tjaden

et al. 2015

Ind. Eng. Chem. Res.

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“…Among the solvents studied for gel‐spinning UHMWPE fiber, paraffin oil and decahydronaphthalene (also known as decalin) are arguably the most successful spin‐solvents used in industrial manufacturing. Furthermore, the strongest UHMWPE fibers reported were obtained using one of these solvents; the strength of which is higher than 4 GPa .…”

Section: Introductionmentioning

confidence: 95%

“…For decalin, the spin dope concentration can be lower, reaching 2% due to rapid evaporation that occurs immediately upon extrusion . With such a low concentration, super strong UHMWPE fibers can be obtained . Since decalin is volatile at the typical spinning temperatures, a second extraction solvent is not necessary.…”

Section: Introductionmentioning

confidence: 99%

Gel spinning of UHMWPE fibers with polybutene as a new spin solvent

et al. 2016

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Gel spinning of UHMWPE fibers using low molecular weight polybutene (PB) as a new spin solvent was investigated. A 98/2 wt% PB/UHMWPE gel exhibits a melting temperature around 1158C and shows large-scale phase separation upon cooling the solution to room temperature. The resulting precursor fiber from this gel was hotdrawn to a ratio of 120, yielding a fiber with tensile strength of 4 GPa and Young's modulus of over 150 GPa. Wide-angle X-ray diffraction indicates good molecular orientation along the fiber axis. The results also demonstrate the potential to further improve the mechanical properties. With respect to the gel spinning industry, this new solvent has a number of advantages over paraffin oil and decahydronaphthalene, and holds a promise of greatly improving the process efficiency. POLYM. ENG. SCI., 56:697-706,

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“…It is noteworthy that the conspicuous α relaxation at 50 °C (Figure S3b) of electrolytes Li 18 PYR 27 S 10 , PYR 60 S 5 , Li 10 PYR 30 , PYR 40 S 10 , and Li 18 PYR 42 S 10 , has no effect on σ(T). Thus, this relaxation, which has been related to the crystalline interfacial dynamics of PVDF–HFP [27], seems to have no effect on the ionic or molecular mobility of these electrolytes. Then, over room temperature none of the electrolytes suffers step-like variation of σ, and hence a comparison of σ of the different electrolytes at 25 °C makes sense.…”

Section: Resultsmentioning

confidence: 99%

Solvent-Free and Scalable Procedure to Prepare PYR13TFSI/LiTFSI/PVDF–HFP Thermoplastic Electrolytes with Controlled Phase Separation and Enhanced Li Ion Diffusion

2019

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Solid electrolytes for Li transport have been prepared by melt-compounding in one single step. Electrolytes are composed of polyvinylidene fluoride–hexafluoropropylene (PVDF–HFP) with PYR13TFSI on its own or with varying concentration of LiTFSI. While the extrusion of PVDF–HFP with PYR13TFSI is possible up to relatively high liquid fractions, the compatibility of PVDF–HFP with LiTFSI/PYR13TFSI solutions is much lower. An organo-modified sepiolite with D-α-tocopherol polyethylene glycol 1000 succinate (TPGS-S) can be used to enhance the compatibility of these blends and allows to prepare homogeneous PYR13TFSI/LiTFSI/PVDF–HFP electrolytes with controlled microphase separations by melt-compounding. The structure and morphology of the electrolytes has been studied by FTIR, differential scanning calorimetry (DSC), SEM, and AFM. Their mechanical properties have been studied by classical strain–stress experiments. Finally, ionic conductivity has been studied in the −50 to 90 °C temperature range and in diffusivity at 25 °C by PFG-NMR. These electrolytes prove to have a microphase-separated morphology and ionic conductivity which depends mainly on their composition, and a mechanical behavior typical of common thermoplastic polymers, which makes them very easy to handle. Then, in this solvent-free and scalable fashion, it is possible to prepare electrolytes like those prepared by solvent casting, but in few minutes instead of several hours or days, without solvent evaporation steps, and with ionic conductivities, which are very similar for the same compositions, above 0.1 mS·cm−1 at 25 °C. In addition, some of the electrolytes have been prepared with high concentration of Li ion, what has allowed the anion exchange Li transport mechanism to contribute significantly to the overall Li diffusivity, making DLi become similar and even clearly greater than DTFSI.

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The model of polymer orientation strengthening and production of ultra-high strength fibers

Cited by 21 publications

References 2 publications

Solvent-Free Solid-State-Processed Tapes of Ultrahigh-Molecular-Weight Polyethylene: Influence of Molar Mass and Molar Mass Distribution on the Tensile Properties

Solvent-Free Solid-State-Processed Tapes of Ultrahigh-Molecular-Weight Polyethylene: Influence of Molar Mass and Molar Mass Distribution on the Tensile Properties

Gel spinning of UHMWPE fibers with polybutene as a new spin solvent

Solvent-Free and Scalable Procedure to Prepare PYR13TFSI/LiTFSI/PVDF–HFP Thermoplastic Electrolytes with Controlled Phase Separation and Enhanced Li Ion Diffusion

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