Diacetylene-nylon salt compound and method for production of two-dimensional macromolecular crystals and shaped articles using said compound

A method for the production of a shaped article of high rigidity, which method comprises packing a diacetylene-nylon salt compound represented by the general formula:

• ##STR52## wherein R.sub.1 and R.sub.2 independently stand for at least one member selected from the class consisting of alkylene groups, substituted alkylene groups, cycloalkylene groups, substituted cycloalkylene groups, arylene groups, and substituted arylene groups, in a mold of a desired shape and then thermally polymerizing said compound in said mold at a temperature in the range of 100.degree. to 400.degree. C. under a pressure in the range of 0.5.times.10.sup.4 to 15.times.10.sup.4 atmospheres.