The effect of polymerization conditions and crystallinity on the mechanical properties and fracture of spherulitic nylon 6

Bessell, T.; Hüll, D.; Shortall, J. B.

doi:10.1007/bf00541393

Cited by 89 publications

(40 citation statements)

References 18 publications

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“…It is interesting to note that block copolymers, such as segmental polyester urethane,17, 18 exhibit good mechanical properties only at a PHB content less than 60% and with a crystallinity on the order of 0.4. The same trend was also observed for dry nylon‐6 (PA6) by Besselt et al36 They found that the mechanical properties depend on the degree of crystallinity and observed that samples with a crystallinity higher than 40% are brittle and samples with 30% crystallinity or lower are ductile.…”

Section: Resultssupporting

confidence: 76%

Stress–strain behavior of blends of bacterial polyhydroxybutyrate

El-Taweel

Stoll

Höhne³

et al. 2004

J of Applied Polymer Sci

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A series of blends of bacterial poly(R-hydroxybutyrate) (PHB), with different miscible amorphous components, were prepared. The molecular mass of the amorphous components was varied from M n Ϸ 600 to 200,000 g/mol. Several factors were found to influence the stress-strain behavior of PHB blends: the glass-transition temperature, the average molecular mass of amorphous phase, the content of PHB in the blend, the crystallinity, and the drawing temperature. It was found that a high extension ratio at rupture R Ͼ 3 is obtained only if the PHB content is less than 60% (crystallinity X c Ͻ 0.4), although this holds only for blends of bacterial PHB with a high molecular mass (M n Ͼ 30,000) amorphous component. The lowering of glass-transition temperature by the addition of low molecular mass additives (plasticizers) deteriorates the tensile properties. Measurements at elevated temperatures of ductile blends yielded a marked decrease of both stress at rupture R and extension ratio at rupture R .

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Section: Resultssupporting

confidence: 76%

Stress–strain behavior of blends of bacterial polyhydroxybutyrate

El-Taweel

Stoll

Höhne³

et al. 2004

J of Applied Polymer Sci

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“…The degree of crystallinity will affect mechanical properties such as the elastic modulus and fracture toughness of these fibres [27], however this was not the focus of this study. Crystallinity within the fibre can also have a dependence on the age of the solvent due to the continued degradation of the polymer chains in the formic acid over time.…”

Section: Discussionmentioning

confidence: 99%

PA6 Nanofibre Production: A Comparison between Rotary Jet Spinning and Electrospinning

Rogalski

Bastiaansen

Peijs

2018

Fibers

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Abstract:Polymer nanofibres are created from many different techniques, with varying rates of production. Rotary jet spinning is a relatively new technique for making nanofibres from both polymer solutions and melt. With electrospinning being by far the most widespread processing method for polymer nanofibres, we performed a direct comparison of polyamide 6 (PA6) nanofibre production between these two methods. It was found that electrospinning produced slightly smaller-diameter fibres, which scaled with a decrease in solution viscosity. In comparison, rotary jet spun fibres could be produced from a reduced range of polymer concentrations and exhibited therefore slightly larger diameters with greater variation. Crystallinity of the fibres was also compared between the two techniques and the bulk polymer, which showed a decrease in crystallinity compared to bulk PA6.

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“…However, the authors did not report on the exact crystal structure of the materials. Bessell et al28 have more recently showed that decreasing crystallinity improves PA6 ductility. However, the parallel increase of molar weight of the materials casts doubts on the real origin of the brittle–ductile transition, considering that the lower molar weights are close to the critical value.…”

Section: Introductionmentioning

confidence: 99%

Microporous Organic Materials from Hydrophobic Dipeptides

Görbitz

2007

Chemistry A European J

252

183

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In the last few years dipeptides with two hydrophobic residues (hydrophobic dipeptides) have emerged as an unexpected source of stable microporous organic materials. Supramolecular self-assembly of the rather small building blocks is dictated by stringent demands on the hydrogen-bond formation by the peptide main chains and the aggregation of hydrophobic entities in the side chains. A systematic survey of structures derived from single-crystal X-ray diffraction studies has revealed the existence of two large classes of structures, differing in the dimensionality of the hydrogen-bonding patterns in the crystals and the nature of the channels. The present review summarizes the structural properties of the microporous dipeptides and discusses their potential applications.

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The effect of polymerization conditions and crystallinity on the mechanical properties and fracture of spherulitic nylon 6

Cited by 89 publications

References 18 publications

Stress–strain behavior of blends of bacterial polyhydroxybutyrate

Stress–strain behavior of blends of bacterial polyhydroxybutyrate

PA6 Nanofibre Production: A Comparison between Rotary Jet Spinning and Electrospinning

Microporous Organic Materials from Hydrophobic Dipeptides

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