Porous Substrate Impregnated with an Aromatic Polyester

A method for forming a prepreg composite, the method comprising:

• contacting a porous substrate with a polymer solution, wherein the polymer solution comprises a solvent and an aromatic polyester that contains aromatic biphenyl units having the following general Formula I and aromatic ester units having the following general Formula II:
• wherein,
• R5 and R6 are independently halo, haloalkyl, alkyl, alkenyl, aryl, heteroaryl, cycloalkyl, or heterocyclyl;
• m and n are independently from 0 to 4;
• X1 and X2 are independently O, C(O), NH, C(O)HN, or NHC(O);
• Z is O or SO2;
• ring B is a substituted or unsubstituted 6-membered aryl group, a substituted or unsubstituted 6-membered aryl group fused to a substituted or unsubstituted 5- or 6-membered aryl group, or a substituted or unsubstituted 6-membered aryl group linked to a substituted or unsubstituted 5- or 6-membered aryl group;
• and
• Y1 and Y2 are independently O, C(O), NH, C(O)HN, or NHC(O), wherein at least one of Y1 and Y2 are C(O);
• and
• thereafter, removing the solvent from the polymer solution to form a composite that comprises the porous substrate and the aromatic polyester.