Journal Article10.1081/MB-100106171
Deformation modes in oriented polymers
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TL;DR: In this paper, a comparison study of creep at room temperature in loaded films and fibers built from macromolecules with different molecular structure (flexible and rigid chain) was carried out.
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Abstract: To clarify an influence of intermolecular interaction on interfibrillar slip, a comparison study of creep at room temperature in loaded films and fibers built from macromolecules with different molecular structure (flexible and rigid chain) was carried out. These were ultimately drawn melt-crystallized and gel-crystallized ultrahigh molecular weight polyethylene (UHMWPE) films and two commercial (poly)paraphenylene terephthalamide (PPTA) fibers, Kevlar 49 (DuPont) and Armos (JSC “Tverchimvolokno”). An extremely high flow creep rate inhomogeneity was observed in both UHMWPE samples, while creep in the fibers from the rigid-chain polymers developed monotonically. Real-time microscopic observations revealed generation of kink bands in loaded UHMWPE samples. No kinks were observed in Kevlar 49 and Armos. The deformation modes operating in the loaded samples are discussed.
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Citations
High Performance Fibers Based on Rigid and Flexible Polymers
TL;DR: A very interesting monomer namely, 2,5dihydroxyterephthalic is used for making poly{2,6−diimidazo[4,5−b:4′,5′•e]pyridinylene•1,4•(2,5-dhydroxy)phenylene} (PIPD) as discussed by the authors.
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Laser-Interferometric Creep Rate Spectroscopy of Polymers
Vladimir A. Bershtein,Pavel N. Yakushev +1 more
- 01 Jan 2010
TL;DR: Laserinterferometric creep rate meter (LICRM) and creep rate spectroscopy (CRS) were developed in the Materials Dynamics Laboratory at Ioffe Physical-Technical Institute of the Russian Academy of Sciences (Saint-Petersburg) as discussed by the authors.
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The role of chain length and conformation in stress-transmission and fracture of thermoplastic polymers
TL;DR: In this article, a review of the molecular aspects of fracture is given, a subject that was pioneered by S. N. Zhurkov and his colleagues, focusing on the mechanisms of stress transfer onto straight chain segments, the role of chain interpenetration in establishing interfacial strength during crack healing, the concept of taut tie molecules, stress distribution in UHMWPE fibers, and the possible role of string ruptures in the deformation process of fibres.
Morphological Transformation in Polymer Composite Materials Filled with Carbon Nanoparticles: Part 2—Thermal and Mechanical Properties
TL;DR: In this paper , the thermal properties of the obtained fibers were investigated by DSC and TGA methods and it was shown that the nanofillers can be influenced by high temperatures at which the molecular mobility in the interlamellar regions became active, while the melting point and the crystallinity degree of the samples were not affected.
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Kinking in the drawing of linear polyethylene
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20
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