Publication detail

The effects of morphology on the yield behaviour of polyethylene copolymers.

VESELÝ, P. FIEDLER, L. NEZBEDOVÁ, E. VLACH, B.

Czech title

Vliv morfologie na deformační chování PE kopolymerů

English title

The effects of morphology on the yield behaviour of polyethylene copolymers.

Type

journal article - other

Language

en

Original abstract

Semi-crystalline polymers such as polyethylene typically display necking behaviour and a yield point in tensile stress/strain curves. Yield points are always associated with a deformation mechanism which absorbs energy. For semi-crystalline polymers this mechanism involves orientation and destruction of micron to colloidal scale semi-crystalline morphologies. We utilized this result to study the deformation behaviour of several PE types which differed in the SCB and molecular weight. The standard tensile test was used for estimation the yield stress and yield strain of the materials in the study. WAXS technique was applied to observe the re-orientation of lamellae structure as a consequence of changes in deformation rate.

Czech abstract

Semikrystalické polymery jako i PE vykazují deformační chování doprovázané dloužením během deformace. Tento proces je spojený s absorbcí mechanické energie, která je také spotřebována na reorintaci a přeskupování lamel. Toto chování bylo sledováno jednak na makroskopické úrovni-tahová zkouška a jednak pomocí techniky WAXS.

English abstract

Semi-crystalline polymers such as polyethylene typically display necking behaviour and a yield point in tensile stress/strain curves. Yield points are always associated with a deformation mechanism which absorbs energy. For semi-crystalline polymers this mechanism involves orientation and destruction of micron to colloidal scale semi-crystalline morphologies. We utilized this result to study the deformation behaviour of several PE types which differed in the SCB and molecular weight. The standard tensile test was used for estimation the yield stress and yield strain of the materials in the study. WAXS technique was applied to observe the re-orientation of lamellae structure as a consequence of changes in deformation rate.

Keywords in English

Polyethylene, deformation behaviour, WAXS

RIV year

2005

Released

22.09.2005

ISSN

0009-2770

Journal

Chemické listy (IF = 0.348)

Volume

2005

Number

99

Pages count

3

BIBTEX


@article{BUT45243,
  author="Petr {Veselý} and Lubomír {Fiedler} and Eva {Nezbedová} and Bohumil {Vlach},
  title="The effects of morphology on the yield behaviour of polyethylene copolymers.",
  journal="Chemické listy (IF = 0.348)",
  year="2005",
  volume="2005",
  number="99",
  month="September",
  issn="0009-2770"
}