Fracture behaviour of polypropylene sheets filled with epoxidized natural rubber (ENR)-treated coal gangue powder

The morphology, deformation and fracture properties of polypropylene sheets filled with untreated and epoxidized natural rubber (ENR)-treated coal gangue powder (CGP) were investigated by scanning electron microscope (SEM) and the essential work of fracture (EWF) method. The results show that ENR ob...

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Bibliographic Details
Published in:Journal of materials science 2007-06, Vol.42 (11), p.3856-3864
Main Authors: BIN LI, GUAN GONG, XIE, Bang-Hu, WEI YANG, YANG, Ming-Bo, LAI, Sheng-Min
Format: Article
Language:English
Subjects:
Applied sciences
Coal
Composites
Crack propagation
Ductile fracture
Exact sciences and technology
Forms of application and semi-finished materials
Fracture mechanics
Fracture toughness
Gangue
Materials science
Morphology
Natural rubber
Necking
Particulate composites
Plastic deformation
Plastic zones
Polymer industry, paints, wood
Polymer matrix composites
Polypropylene
Polypropylenes
Scanning electron microscopy
Sheets
Technology of polymers
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Summary:The morphology, deformation and fracture properties of polypropylene sheets filled with untreated and epoxidized natural rubber (ENR)-treated coal gangue powder (CGP) were investigated by scanning electron microscope (SEM) and the essential work of fracture (EWF) method. The results show that ENR obviously improves the dispersion of CGP particles in the PP matrix and the interfacial adhesion between CGP particles and PP matrix with the well-established interfacial layer. It is found that all composites fracture in a ductile manner as ligament yields completely and crack propagates steadily. The fracture toughness (we) of the composites is significantly improved with the complete interfacial layer formed by ENR on the surface of CGP particles. With increasing ENR content, the specific plastic work (wp) per volume unit of plastic zone of the composites increases considerably in spite of the restricted plastic deformation of plastic zones. In Addition, the fracture parameters of different stages of tensile process demonstrate that the positive effect of ENR on the fracture performance of the composites is mainly achieved by notably reinforcing crack resistance at the stage of necking-tearing after yielding.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0488-7