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JANČÁŘ, J. TOCHÁČEK, J.
Original Title
Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers
Type
journal article in Web of Science
Language
English
Original Abstract
The effect of structural changes induced by multiple extrusion on the impact fracture behavior of three reactor poly(propylene) impact-copolymers (ICPPs) was investigated. The morphogenesis of the complex ICPP structure was controlled by the competition between the intraspherulitic phase separation and crystallization. The rubbery inclusion size was controlled by the rate of spinodal decomposition at the onset of crystallization. The following fast spherulite growth fixed the size and spatial distribution of these inclusions. The Charpy notched impact strength (ak) and critical strain energy release rate (Gc) measured under impact loading decreased significantly with the number of extruder passes. A measurable reduction of the size of the crack tip plastic zone (Rp) with the number of extruder passes was observed using high speed digital camera. While the melt flow index (MFI) dependence of ak exhibited ICPP specific shape, the MFI dependences of Gc fell on a single master curve at both 23 and 20 C.
Keywords
ICPP, impact strength, fracture mechanics, thermal history
Authors
JANČÁŘ, J.; TOCHÁČEK, J.
RIV year
2013
Released
1. 8. 2013
Publisher
Wiley
Location
Weinheim, SRM
ISBN
1521-3900
Periodical
Macromolecular symposia
Year of study
330
Number
1
State
Federal Republic of Germany
Pages from
166
Pages to
176
Pages count
11
BibTex
@article{BUT105080, author="Josef {Jančář} and Jiří {Tocháček}", title="Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers", journal="Macromolecular symposia", year="2013", volume="330", number="1", pages="166--176", doi="10.1002/masy.201300084", issn="1521-3900" }