Toughening of epoxies via craze-like damage

The fracture behavior of a core‐shell rubber (CSR) modified epoxy is investigated using both fracture mechanics and microscopy tools. The CSR‐modified epoxy is found to be toughened via numerous line‐array cavitations of the CSR particles, followed by plastic flow of the epoxy matrix. The toughening...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 1993-04, Vol.31 (5), p.595-608
Main Authors: Sue, H.-J., Garcia-Meitin, E. I., Orchard, N. A.
Format: Article
Language:English
Subjects:
Applied sciences
core-shell rubber
craze-like damage
double-notch four-point-bend technique
epoxy
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
Properties and characterization
toughening mechanisms
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Summary:The fracture behavior of a core‐shell rubber (CSR) modified epoxy is investigated using both fracture mechanics and microscopy tools. The CSR‐modified epoxy is found to be toughened via numerous line‐array cavitations of the CSR particles, followed by plastic flow of the epoxy matrix. The toughening effect via the above craze‐like damage process is found to be as effective as that of the well‐known widespread rubber cavitation/matrix shear yielding mechanisms. The conditions for triggering the craze‐like damage appear to be both stress state and rubber concentration dependent. The type of rubber tougheners utilized also plays a critical role in triggering this rather unusual craze‐like damage in epoxy systems. © 1993 John Wiley & Sons, Inc.
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.1993.090310511