Essential work of fracture and failure mechanisms in dynamically vulcanized thermoplastic elastomer nanocomposites based on PA6/NBR/XNBR-grafted HNTs

•Analysis of dynamically vulcanized PA6/NBR/XNBR-grafted HNTs nanocomposites.•Effect of XNBR-grafted HNTs on the fracture toughness of multiphase polymer systems.•The enhancement of non-essential work of fracture by the XNBR-grafted HNTs.•The nanotubes can act as inhibitor sites for crack propagatio...

Full description

Saved in:
Bibliographic Details
Published inEngineering fracture mechanics Vol. 200; pp. 251 - 262
Main Authors Paran, S.M.R., Naderi, G., Ghoreishy, M.H.R., Dubois, C.
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.09.2018
Elsevier BV
Subjects
Butadiene
Crack initiation
Crack propagation
Edge dislocations
Elastomers
Essential work
Failure mechanisms
Fracture mechanics
Fracture toughness
Grafting
Microstructure
Morphology
Multiphase
Nanocomposite
Nanocomposites
Nanotubes
Nitrile rubber
Polyamide resins
Rubber
Shear bands
Stretching
Studies
Thermoplastic elastomer vulcanizate
Thermoplastic elastomers
Essential work
Nanocomposite
Thermoplastic elastomer vulcanizate
Fracture toughness
Online AccessGet full text

Cover

More Information
Summary:•Analysis of dynamically vulcanized PA6/NBR/XNBR-grafted HNTs nanocomposites.•Effect of XNBR-grafted HNTs on the fracture toughness of multiphase polymer systems.•The enhancement of non-essential work of fracture by the XNBR-grafted HNTs.•The nanotubes can act as inhibitor sites for crack propagation in PA6/NBR TPVs. A detailed fracture toughness analysis of dynamically vulcanized thermoplastic elastomer nanocomposites based on polyamide-6 (PA6) and nitrile butadiene rubber (NBR) reinforced by various concentrations of carboxylated nitrile butadiene rubber (XNBR)-grafted halloysite nanotubes (HNTs) was monitored through using essential work of fracture (EWF) procedure assisted by microstructure observations. The effect of various rubber phase and nanotube loadings on the morphology and fracture toughness of prepared multiphase polymer systems were investigated. The results of EWF analysis suggested that the dominant fracture mechanism in dynamically vulcanized PA6/NBR thermoplastic elastomers containing various rubber phase loadings was the dilatation shear bands resulted from repeated rubber particle debonding which enhances the shear yielding of PA6 matrix. Whereas, the incorporation of XNBR-grafted HNTs into the dynamically vulcanized PA6/NBR thermoplastic elastomers reduced the essential work of fracture followed by enhancement of non-essential work of fracture. However, the aggregation of nanotubes causes to form active sites for crack initiation. The results suggested that the XNBR-grafted HNTs can act as inhibitor sites for crack propagation when individually dispersed in the PA6/NBR multiphase systems.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2018.07.018