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

A 2D 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) six identical linear bridge units, wherein the nodal units comprise benzene, the bridge units comprise acetylene or polyacetylene, and the 2D polymer has the formula XVIII or XIX, 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:

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 nodal units comprise benzene, the bridge units comprise 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:

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) four or more identical linear bridge units, wherein the bridge units comprise amide or polyamide.

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) six identical linear bridge units, wherein the nodal units comprise benzene, the bridge units comprise 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:

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 or more identical linear bridge units, wherein the nodal units comprise benzene, the bridge units comprise oxazole, benzoxazole or polybenzoxazole, and the 2D polymer has the formula VI, VII, VIII or IX, 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: