Two dimensional polymers comprised of a combination of stiff and compliant molecular units

A two-dimensional (2D) polymer comprising:

• a regular, repeating, 2D covalent bond network of (i) a plurality of identical nodes in two dimensions, each node comprised of one or more carbon-containing cyclic nodal units, which are joined by (ii) three identical linear bridge units, wherein the bridge units comprise:
• (a) ethylene or polyethylene;
• and the 2D polymer has the chemical formula I′, wherein n is an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• (b) amide or polyamide;
• and the 2D polymer has the formula II′, III′, IV′, or V′, wherein n is an integer ≥1, and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular. repeating 2D bond network:
• (c) thiazole or polythiazole, or imidazole or polyimidazole;
• and the 2D polymer has the formula X′ or XI′, wherein n is an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular. repeating 2D bond network:
• (d) hydroquinone-diimidazopyridine or poly(hydroquinone-diimidazopyridine);
• and the 2D polymer has the formula XII′, wherein n is an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• (e) a monomer or polymer comprising 4-hydroxybenzoic acid and/or 6-hydroxy-2-naphthoic acid;
• and the 2D polymer has the chemical formula XII′ or XIV′, wherein x, y and n are each an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• (f) a monomer or polymer comprising one or more cyclic units and one or more esters;
• and the 2D polymer has the formula XVI′ or XVII′, wherein n is an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• (g) amic or polyamic acid;
• and the 2D polymer has the formula XXI′, wherein ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• (h) acetylene or polyacetylene;
• and the 2D polymer has the formula XVIII′, wherein n is an integer ≥1 and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in a regular, repeating 2D bond network:
• (i) imide and the 2D polymer has the formula XXII′ or XXIII′, wherein ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network:
• or (j) oxazole, benzoxazole or polybenzoxazole, and the 2D polymer has the formula VII′ or VIII′, wherein m is an integer ≥2, n is an integer ≥1, and ˜˜ represent imaginary cut-lines in the bridge units showing where they extend to other nodal units in the regular, repeating 2D bond network: