Improved oxygen permeation of a multi-stranded network two-dimensional polymer synthesized by three-step polymerizations of a novel monomer bearing three different polymerizable groups followed by photoexfoliation

Abstract We synthesized a novel multi-stranded network two-dimensional polymer (2DP) by three-step polymerizations of a new acetylene monomer bearing three different polymerizable groups, two styrenes and one allyl group, followed by photoexfoliation. The starting linear polyacetylene was soluble and fabricated as a good self-supporting membrane, and the following two polymerizations, photo-induced radical addition polymerization and acyclic diene metathesis polycondensation, were carried out in the membrane states. The resulting membranes maintained self-supporting properties. Finally, 2DP was obtained by highly selective photocyclic aromatization (SCAT) of the original polyacetylene backbone. As a result, both of the oxygen permeability and permselectivity increased simultaneously and the performance was placed above the upper bound line.