Stitched polymer matrix composites using barrier layers for cryogenic applications and methods of making the same

A stitched polymer matrix composite for cryogenic applications, the polymer matrix composite comprising:

• a stitched composite, comprising:
• two or more plies:
• at least one thin ply having a thickness of up to 0.05 mm;
• stitching disposed across a through-thickness of the stitched composite to provide a stitched preform;
• and
• a nanographene dispersed resin infused into the stitched preform after the stitching;
• wherein the at least one thin ply is disposed at one or both of a surface of the stitched composite and between the two or more plies;
• and
• further wherein the at least one thin ply and the infused nanographene dispersed resin create a hybrid barrier layer which provides the stitched polymer matrix composite with enhanced resistance to microcracking and reduced gas permeability during thermal cycling.