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

článek v časopise - ostatní, Jost

angličtina

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.

Polyethylene, deformation behaviour, WAXS

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

2005

22. 9. 2005

0009-2770

Chemické listy

2005

99

Česká republika

484-486

3