Blocking/Deblocking Resin Systems for Use as a "Co-Cure-Ply" in the Fabrication of Large-Scale Composite Structure

摘要

A method for bonding composite structures which includes providing a first and second composite substrate and coupling a co-cure prepreg tape having chemically protected polymerizable functional groups onto a surface of both the first and second composite substrates. The first and second composite substrates are then cured to the co-cure prepreg tape at a first temperature to form a co-cure prepreg tape portion where the first and second composite substrates are fully cured and the co-cure prepreg tape is partially cured. The co-cure prepreg tape portion of the first composite substrate is then coupled to the co-cure prepreg tape portion of the second composite substrate and a deprotection initiator is applied to facilitate deprotection of the chemically protected polymerizable functional groups and cure the co-cure prepreg tape portion of the first and second composite substrates to form a single covalently bonded composite structure.

主权项

1. A method for bonding composite substrates comprising:
providing a first composite substrate and a second composite substrate wherein both the first composite substrate and the second composite substrate are uncured or partially cured and comprise one or more reinforcement fibers and a first curable resin; coupling a co-cure prepreg tape onto a faying surface of both the first and second composite substrates wherein the co-cure prepreg tape comprises a second curable resin having one or more chemically protected polymerizable functional groups; curing the first and second composite substrates to the co-cure prepreg tape at a first temperature to form a co-cure prepreg tape portion wherein the first and second composite substrates are fully cured and the co-cure prepreg tape is partially cured; coupling the co-cure prepreg tape portion of the first composite substrate to the co-cure prepreg tape portion of the second composite substrate; applying a second temperature to facilitate deprotection with water and a hydrolysis catalyst of the chemically protected polymerizable functional groups to give unprotected polymerizable functional groups and cure the co-cure prepreg tape portion of the first composite substrate to the co-cure prepreg tape portion of the second composite substrate to form a single covalently bonded composite structure.