Structure transfer from a polymeric melt to the solid state Part III: Influence of knots on structure and mechanical properties of semicrystalline polymers

Bayer, R. K.

doi:10.1007/bf00658889

Cited by 26 publications

(16 citation statements)

References 23 publications

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“…Point C was found to be shifted toward lower strains when molecular weight M of the polymer is below a certain value M t [82] (for PE it corresponds to M t ffi 1:5 Â 10 5 g mol À1 :). This effect is associated with the occurrence of clusters of chain entanglements in the amorphous phase [91]. The last critical point D corresponds to a disentanglement of polymer chains at large strains.…”

Section: Deformation Behavior Of Semicrystalline Polymers At Small-stmentioning

confidence: 98%

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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The review focuses on the current studies of the deformation response and accompanying structural transformations of thermoplastic semicrystalline polymers subjected to uniaxial tension prior to the yield point. The mechanisms of strain-induced cavitation of amorphous layers and damages of crystalline lamellae are analyzed in line with novel results on the deformation behavior of solid polymers at temperatures exceeding the glass transition point. The coupling of viscoelastic and plastic deformation mechanisms with the small-strain structural transformations is critically discussed on the basis of the advanced theoretical modeling of mechanical properties of semicrystalline polymers.

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Section: Deformation Behavior Of Semicrystalline Polymers At Small-stmentioning

confidence: 98%

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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“…Knots have been discovered in both biopolymers (e.g., nucleic acids and proteins) and synthetic polymers [113]. Polymer knots have drawn remarkable interest, partially because of their influence on the structure and mechanical properties of polymers [114]. In fact, the topological constriction of knots can be detrimental to polymer stability.…”

Section: Strained Macrocyclesmentioning

confidence: 99%

Molecular Mechanochemistry: Engineering and Implications of Inherently Strained Architectures

Sheiko

2015

Topics in Current Chemistry

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Mechanical activation of chemical bonds is usually achieved by applying external forces. However, nearly all molecules exhibit inherent strain of their chemical bonds and angles as a result of constraints imposed by covalent bonding and interactions with the surrounding environment. Particularly strong deformation of bonds and angles is observed in hyperbranched macromolecules caused by steric repulsion of densely grafted polymer branches. In addition to the tension amplification, macromolecular architecture allows for accurate control of strain distribution, which enables focusing of the internal mechanical tension to specific chemical bonds and angles. As such, chemically identical bonds in self-strained macromolecules become physically distinct because the difference in bond tension leads to the corresponding difference in the electronic structure and chemical reactivity of individual bonds within the same macromolecule. In this review, we outline different approaches to the design of strained macromolecules along with physical principles of tension management, including generation, amplification, and focusing of mechanical tension at specific chemical bonds.

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“…[129] Außerdem kçnnen auch intermolekulare Verknäuelun-gen von mehreren Polymerketten zu Verknotung führen, was die Morphologie und mechanischen Eigenschaften des polymeren Materials beeinflusst. [130] Kürzlich wurde ein auf diesem Prinzip basierendes Material vorgestellt, das ebenfalls nach Demetallierung eine hohe Elastizitätaufweist. [131] …”

Section: Wirt-gast-systeme Und Katalyseunclassified

Molekulare Knoten

Fielden¹,

Leigh²,

Woltering³

2017

Angewandte Chemie

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Der erste synthetische Kleeblattknoten wurde in den späten 1980er Jahren hergestellt. Kompliziertere Knotentopologien wurden jedoch erst in den letzten Jahren in molekularer Form erhalten. Die Verknotung molekularer Stränge erzeugt sterische Einschränkungen und kann so wichtige physikalische und chemische Eigenschaften verleihen, unter anderem Chiralität, starkes und selektives Binden von Ionen und katalytische Aktivität. Da die Anzahl und Komplexität molekularer Knoten steigt, wird es für Chemiker immer wichtiger, die Knotennomenklatur anderer Disziplinen zu verwenden. Hier geben wir einen Überblick über die Synthesestrategien für molekulare Knoten und beschreiben die Grundlagen der Knoten‐, Zopf‐ und Tangle‐Theorie in einem für Chemiker und molekulare Strukturen angemessenen Umfang.

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Structure transfer from a polymeric melt to the solid state Part III: Influence of knots on structure and mechanical properties of semicrystalline polymers

Cited by 26 publications

References 23 publications

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Molecular Mechanochemistry: Engineering and Implications of Inherently Strained Architectures

Molekulare Knoten

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