Detail publikačního výsledku

Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers

JANČÁŘ, J.; TOCHÁČEK, J.

Original Title

Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers

English Title

Effect of Multiple Extrusion on Impact Fracture of Three Poly(propylene) Impact Copolymers

Type

WoS Article

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.

English 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

Key words in English

ICPP, impact strength, fracture mechanics, thermal history

Authors

JANČÁŘ, J.; TOCHÁČEK, J.

RIV year

2014

Released

01.08.2013

Publisher

Wiley

Location

Weinheim, SRM

ISBN

1521-3900

Periodical

Macromolecular symposia

Volume

330

Number

1

State

Federal Republic of Germany

Pages from

166

Pages to

176

Pages count

11

Full text in the Digital Library

http://hdl.handle.net/

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"
}