Analysis of the debonding process in polypropylene model composites

Károly Renner, Min Soo Yang, J. Móczó, Hyoung Jin Choi, B. Pukánszky

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Polypropylene (PP) model composites were prepared using cross-linked PMMA particles with a very narrow particle size distribution as filler in order to study the micromechanical processes, which take place during deformation. Composites containing a commercial CaCO3 filler with a broad particle size distribution were also prepared and studied for comparison. The filler loading of the composites was changed from 0 to 0.3 volume fraction in 0.05 volume fraction steps. Measurements of acoustic emission signals during the elongation of PP/PMMA model composites allowed us to assign the debonding process, including its initiation, unambiguously to a well-defined section of the stress vs. strain curve. The number and intensity of the acoustic signals detected during the deformation of the matrix polymer and the composite, respectively, differed considerably, which made possible the separation of the various micromechanical deformation processes occurring in them. At low extensions the composite is deformed elastically, then debonding takes place in a very narrow deformation range, followed by the plastic deformation of the matrix. At small particle content debonding occurs at relatively low stresses, which differ significantly from the yield stress. Considerable plastic deformation of the matrix begins at the yield point. At larger filler content debonding and shear yielding occur simultaneously. Micromechanical deformation processes cannot be separated as clearly in composites prepared from the commercial CaCO3 filler with a broad particle size distribution. The debonding of particles with different size occurs in a wide deformation range because of the particle size dependence of debonding stress. The analysis of characteristic values derived from acoustic emission experiments proved that the interacting stress fields of neighboring particles influence the deformation process and that even large particles may aggregate or at least associate at large filler content.

Original languageEnglish
Pages (from-to)2520-2529
Number of pages10
JournalEuropean Polymer Journal
Volume41
Issue number11
DOIs
Publication statusPublished - Nov 2005

Fingerprint

Polypropylenes
Debonding
polypropylene
fillers
Fillers
composite materials
Composite materials
particle size distribution
Particle size analysis
acoustic emission
Polymethyl Methacrylate
Acoustic emissions
Particles (particulate matter)
plastic deformation
Volume fraction
Plastic deformation
matrices
yield point
Polymer matrix
stress distribution

Keywords

  • Acoustic emission
  • Debonding
  • Micromechanical deformations
  • Particulate filled polymers
  • Plastic deformation

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Analysis of the debonding process in polypropylene model composites. / Renner, Károly; Yang, Min Soo; Móczó, J.; Choi, Hyoung Jin; Pukánszky, B.

In: European Polymer Journal, Vol. 41, No. 11, 11.2005, p. 2520-2529.

Research output: Contribution to journalArticle

Renner, Károly ; Yang, Min Soo ; Móczó, J. ; Choi, Hyoung Jin ; Pukánszky, B. / Analysis of the debonding process in polypropylene model composites. In: European Polymer Journal. 2005 ; Vol. 41, No. 11. pp. 2520-2529.
@article{4cb279e9a6cf4c74bc3fc647ea15394a,
title = "Analysis of the debonding process in polypropylene model composites",
abstract = "Polypropylene (PP) model composites were prepared using cross-linked PMMA particles with a very narrow particle size distribution as filler in order to study the micromechanical processes, which take place during deformation. Composites containing a commercial CaCO3 filler with a broad particle size distribution were also prepared and studied for comparison. The filler loading of the composites was changed from 0 to 0.3 volume fraction in 0.05 volume fraction steps. Measurements of acoustic emission signals during the elongation of PP/PMMA model composites allowed us to assign the debonding process, including its initiation, unambiguously to a well-defined section of the stress vs. strain curve. The number and intensity of the acoustic signals detected during the deformation of the matrix polymer and the composite, respectively, differed considerably, which made possible the separation of the various micromechanical deformation processes occurring in them. At low extensions the composite is deformed elastically, then debonding takes place in a very narrow deformation range, followed by the plastic deformation of the matrix. At small particle content debonding occurs at relatively low stresses, which differ significantly from the yield stress. Considerable plastic deformation of the matrix begins at the yield point. At larger filler content debonding and shear yielding occur simultaneously. Micromechanical deformation processes cannot be separated as clearly in composites prepared from the commercial CaCO3 filler with a broad particle size distribution. The debonding of particles with different size occurs in a wide deformation range because of the particle size dependence of debonding stress. The analysis of characteristic values derived from acoustic emission experiments proved that the interacting stress fields of neighboring particles influence the deformation process and that even large particles may aggregate or at least associate at large filler content.",
keywords = "Acoustic emission, Debonding, Micromechanical deformations, Particulate filled polymers, Plastic deformation",
author = "K{\'a}roly Renner and Yang, {Min Soo} and J. M{\'o}cz{\'o} and Choi, {Hyoung Jin} and B. Puk{\'a}nszky",
year = "2005",
month = "11",
doi = "10.1016/j.eurpolymj.2005.05.025",
language = "English",
volume = "41",
pages = "2520--2529",
journal = "European Polymer Journal",
issn = "0014-3057",
publisher = "Elsevier Limited",
number = "11",

}

TY - JOUR

T1 - Analysis of the debonding process in polypropylene model composites

AU - Renner, Károly

AU - Yang, Min Soo

AU - Móczó, J.

AU - Choi, Hyoung Jin

AU - Pukánszky, B.

PY - 2005/11

Y1 - 2005/11

N2 - Polypropylene (PP) model composites were prepared using cross-linked PMMA particles with a very narrow particle size distribution as filler in order to study the micromechanical processes, which take place during deformation. Composites containing a commercial CaCO3 filler with a broad particle size distribution were also prepared and studied for comparison. The filler loading of the composites was changed from 0 to 0.3 volume fraction in 0.05 volume fraction steps. Measurements of acoustic emission signals during the elongation of PP/PMMA model composites allowed us to assign the debonding process, including its initiation, unambiguously to a well-defined section of the stress vs. strain curve. The number and intensity of the acoustic signals detected during the deformation of the matrix polymer and the composite, respectively, differed considerably, which made possible the separation of the various micromechanical deformation processes occurring in them. At low extensions the composite is deformed elastically, then debonding takes place in a very narrow deformation range, followed by the plastic deformation of the matrix. At small particle content debonding occurs at relatively low stresses, which differ significantly from the yield stress. Considerable plastic deformation of the matrix begins at the yield point. At larger filler content debonding and shear yielding occur simultaneously. Micromechanical deformation processes cannot be separated as clearly in composites prepared from the commercial CaCO3 filler with a broad particle size distribution. The debonding of particles with different size occurs in a wide deformation range because of the particle size dependence of debonding stress. The analysis of characteristic values derived from acoustic emission experiments proved that the interacting stress fields of neighboring particles influence the deformation process and that even large particles may aggregate or at least associate at large filler content.

AB - Polypropylene (PP) model composites were prepared using cross-linked PMMA particles with a very narrow particle size distribution as filler in order to study the micromechanical processes, which take place during deformation. Composites containing a commercial CaCO3 filler with a broad particle size distribution were also prepared and studied for comparison. The filler loading of the composites was changed from 0 to 0.3 volume fraction in 0.05 volume fraction steps. Measurements of acoustic emission signals during the elongation of PP/PMMA model composites allowed us to assign the debonding process, including its initiation, unambiguously to a well-defined section of the stress vs. strain curve. The number and intensity of the acoustic signals detected during the deformation of the matrix polymer and the composite, respectively, differed considerably, which made possible the separation of the various micromechanical deformation processes occurring in them. At low extensions the composite is deformed elastically, then debonding takes place in a very narrow deformation range, followed by the plastic deformation of the matrix. At small particle content debonding occurs at relatively low stresses, which differ significantly from the yield stress. Considerable plastic deformation of the matrix begins at the yield point. At larger filler content debonding and shear yielding occur simultaneously. Micromechanical deformation processes cannot be separated as clearly in composites prepared from the commercial CaCO3 filler with a broad particle size distribution. The debonding of particles with different size occurs in a wide deformation range because of the particle size dependence of debonding stress. The analysis of characteristic values derived from acoustic emission experiments proved that the interacting stress fields of neighboring particles influence the deformation process and that even large particles may aggregate or at least associate at large filler content.

KW - Acoustic emission

KW - Debonding

KW - Micromechanical deformations

KW - Particulate filled polymers

KW - Plastic deformation

UR - http://www.scopus.com/inward/record.url?scp=24344452578&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=24344452578&partnerID=8YFLogxK

U2 - 10.1016/j.eurpolymj.2005.05.025

DO - 10.1016/j.eurpolymj.2005.05.025

M3 - Article

AN - SCOPUS:24344452578

VL - 41

SP - 2520

EP - 2529

JO - European Polymer Journal

JF - European Polymer Journal

SN - 0014-3057

IS - 11

ER -