Optimization of mode-I fracture toughness of high-performance epoxies by using designed core-shell rubber particles
- Texas Polymer Center, Freeport, TX (United States)
- Dow Chemical Co., Midland, MI (United States)
The fracture behavior of high-performance epoxies modified with seven types of designed core-shell rubber particles is examined by using various microscopic techniques. The mode-I plane-strain fracture-toughness values (K{sub Ic}) of the designed rubber-modified epoxy systems that have highly cross-linked epoxy vary with the architecture of the interface between the matrix and the rubber particles. Accordingly, the toughening mechanisms observed among these systems are very different: rubber-particle cavitation and matrix shear yielding are found in systems that exhibit higher K{sub Ic} values; only crack deflection is found in systems that possess lower K{sub Ic} values. Synergistic toughening can be obtained if both the matrix shear-yielding and the crack-deflection mechanisms are operative upon fracture. An approach for toughening highly cross-linked epoxies is addressed. 67 refs., 18 figs., 2 tabs.
- OSTI ID:
- 76237
- Report Number(s):
- CONF-900802-; TRN: 94:009880-0018
- Resource Relation:
- Conference: 200. American Chemical Society (ACS) national meeting, Washington, DC (United States), 26-31 Aug 1990; Other Information: PBD: 1993; Related Information: Is Part Of Toughened plastics I: Science and engineering; Riew, C.K.; Kinloch, A.J. [eds.]; PB: 567 p.
- Country of Publication:
- United States
- Language:
- English
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