Zur Zugdehnungs‐Charakteristik orientierter Hartfasern aus flexiblen Polymeren

Schultze-Gebhardt, F.

doi:10.1002/actp.1989.010400604

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…Assuming a uniform distribution of TTM over the cross section of the noncrystalline regions and if ( L (1¯05) / L ) is used as the linear degree of order, the following equation for the axial Young's modulus E is valid: where E a is the axial modulus of a completely amorphous sample and E c is the axial modulus of a single crystal sample. Provided E a ≪ E c and knowing E and ( L (1¯05) / L ), the fraction β of TTM can be estimated as follows18: …”

Section: Methodsmentioning

confidence: 99%

Effect of fine structure on fatigue resistance property of poly(ethylene terephthalate) tire cord fibers

Cho

Lee

Bang

2000

J. Appl. Polym. Sci.

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Seven experimental poly(ethylene terephthalate) (PET) fibers were spun and then drawn under different processing conditions (i.e., spinning speed and draw ratio) in such a way that the fibers possessed different long periods but retained the same crystal structure. Wide angle X‐ray diffraction, small angle X‐ray scattering, loss modulus, initial modulus, and taut tie molecules measurements were used to characterize the fine structure and the physical property of the fibers. The influence of the fine structure on the extensional fatigue behavior of the PET fibers was studied by subjecting them to 120–180 rpm at a repeated extension at 104–106 cycles. In order to detect the molecular motion of PET with the extensional fatigue, we carried out differential scanning calorimetry, X‐ray diffraction, density, and thermoluminescence (TL) experiments. The high temperature TL (above room temperature) intensity decreased with a 104 cycle extension but increased with a 105 cycle extension. The extent of change in the TL intensity was found to be a function of the long period and loss modulus. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 90–100, 2000

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Section: Methodsmentioning

confidence: 99%

Effect of fine structure on fatigue resistance property of poly(ethylene terephthalate) tire cord fibers

Cho

Lee

Bang

2000

J. Appl. Polym. Sci.

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An estimation of the fraction of taut tie molecules in oriented semicrystalline fibres from their modulus of elasticity

Schultze-Gebhardt

1990

Acta Polymerica

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Act. Colymoriu 41 (IW) Nr. 9 512 SCHULTZE-GEBHBRDT : An estimation of the fraction of taut tie molecules lichen Verlauf, die Aktivitatskoeffizienten der einwertigen Kationen sind jedoch geringer. Sie liegen im Bereich 0,7 bis 0,3. Dagegen wird fur Na-Polyacrylat/acrylamid-Polyelektrolyte angegeben, daS in salzfreier Losung keine Konzentrationsabhangigkeit fur die Natriumionen-Aktivitatskoeffizienten besteht 171. Eine Abhangigkeit der Gegenionen-Aktivitatskoeffizienten von der Molmasse des Poly-DMDAAC wird nicht gefunden. ExperimenielhsDie untersuchten Polymerproben wurden durch radikalische Polymerisation von DMDAAC in wailriger Losung unter Sauerstoffausschluil hergestellt. Das Zahlenmittel der relativen Molmasse wurde aus Viskositatsmessungen entsprechend [8] berechnet. Fur alle Messungen wurde dss Prazisions-Digital-pH-MeDgerat Typ OP-208/1 der Fa. Radelkis, Budapest, verwendet. Als MeSelektroden kamen die selektive chloridionen-empfindliche Elektrode OP-C1-07113 und die Ag/AgCl-Bezugselektrode mit doppelter Salzbrucke OP-08203 zum Einsatz. Die Messungen wurden bei 293,15 K unter Ruhren mit Temperaturkompensation durchgefuhrt. Zur Ermittlung der Konzentrationsabhangigkeiten wurden zu 100 nll Losungsmittel (bidest. H,O, Zuckerlosung, Salzlosung) 0,l molare chloridhaltige Losung zudosiert. Wir danken Frau G. PETERS fur sorgfaltige experimentelle Mitarbeit.

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Zur Zugdehnungs‐Charakteristik orientierter Hartfasern aus flexiblen Polymeren

Cited by 2 publications

References 23 publications

Effect of fine structure on fatigue resistance property of poly(ethylene terephthalate) tire cord fibers

Effect of fine structure on fatigue resistance property of poly(ethylene terephthalate) tire cord fibers

An estimation of the fraction of taut tie molecules in oriented semicrystalline fibres from their modulus of elasticity

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