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US 10,093,778 B2Granted
Bonding composite structures using interpenetrating polymer network adhesives
AssigneeThe Boeing Company
InventorGary Robert Weber
Life of this patent
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Abstract
An interpenetrating polymer network (IPN) adhesive comprises an acrylated polymer system curable by radiation, and a flexible epoxy system thermally curable after the acrylated polymer system is cured.
Claims12
A reinforced composite structure, comprising:
- a reinforcement;
- and
- a matrix in which the reinforcement is embedded, the matrix including an interpenetrating polymer network (IPN) forming a flexible gradient interface around the reinforcement resulting in improved shear force transfer from the matrix to the reinforcement;
- wherein the IPN of the matrix comprises an acrylated polymer system and a flexible polymer system, the flexible polymer system having a higher surface tension than the acrylated polymer system so that the higher surface tension causes the flexible polymer system to attach to the reinforcement resulting in the flexible gradient interface;
- and wherein the acrylated polymer system comprises bisphenol A diacrylate (BPADA) and a trifunctional acrylate.
2 more elements
Dependencies are inferred from the claim text.