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In-Situ Phase Separation of an Amine-Terminated Siloxane in Epoxy Matrices

  • D. F. Bergstrom (a1), G. T. Burns (a1), G. T. Decker (a1), R. L. Durall (a1), D. Fryrear (a1), G. A. Gornowicz (a1), M. Tokunoh (a2) and N. Odagiri (a2)...

Abstract

We have developed an amino-functional silicone resin to toughen epoxies which, when prereacted with the epoxy function in resins, undergoes in-situ phase separation during final epoxy curing. SEM analyses of the morphology of fracture surfaces of MY720- DDS, Epon 828-DDS and other epoxy matrices modified with the silicone resin showed rough surfaces with the formation of very uniform <10 μm spheres. Silicon and sulfur elemental distribution mapping showed silicon rich spheres embedded in an epoxy matrix. We report cavitation, particle debonding and pull-out, and an increases in fracture surface area as possible modes of toughening. Silicone modified materials give improvements in slow strain rate G1c fracture toughness measurements of 250–400%, similar to carboxy terminated polybutadiene-acrylonitrile copolymer (CTBN) modifiers, but with a much smaller flexural modulus loss. The Tg of the modified epoxy matrices are maintained, moisture resistance is improved, and flammability is reduced.

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In-Situ Phase Separation of an Amine-Terminated Siloxane in Epoxy Matrices

  • D. F. Bergstrom (a1), G. T. Burns (a1), G. T. Decker (a1), R. L. Durall (a1), D. Fryrear (a1), G. A. Gornowicz (a1), M. Tokunoh (a2) and N. Odagiri (a2)...

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