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VESELÝ, Petr VLACH, Bohumil NEZBEDOVÁ, Eva FIEDLER, Lubomír
Original Title
The Effects of Morphology on the Yield Behaviour of Polyethylene Copolymers
Type
conference paper
Language
English
Original Abstract
Several polyethylene copolymers from Czech production (which differed in the number of short change branches - SCB and molecular weight) were compared with two reference types of polyethylene copolymers from foreign production. Standard tensile specimens were prepared and the tensile test under different deformation speed (50, 5, 0.5 mm/min) and above glass transition temperature (Tg) was carried out. The results have shown changes in tensile yield stress in dependence on deformation speed and type of polyethylene copolymer. All materials types have shown non-linear behaviour above glass transition temperature. The WAXS analysis (wide-angle X-scattering) detected that, when the deformation speed was low, the macroscopic yield stress was affected from the re-orientation of crystalline lamellae. These facts could be also observed on the profile of the neck. The shape of the neck can tell us about heterogeneity of individual material types.
Keywords
Polyethylene, Deformation behaviour
Authors
VESELÝ, Petr; VLACH, Bohumil; NEZBEDOVÁ, Eva; FIEDLER, Lubomír
RIV year
2005
Released
20. 9. 2005
Location
FSI VUT BRNO
ISBN
80-214-2984-4
Book
Sborník konference
Pages from
263
Pages to
266
Pages count
4
BibTex
@inproceedings{BUT16593, author="Petr {Veselý} and Lubomír {Fiedler} and Eva {Nezbedová} and Bohumil {Vlach}", title="The Effects of Morphology on the Yield Behaviour of Polyethylene Copolymers", booktitle="Sborník konference", year="2005", pages="263--266", address="FSI VUT BRNO", isbn="80-214-2984-4" }