Synthesis And Gharacterization Of An Ordered Ladder Pplyester

In the field of polymer science, chemist have pay much attention to synthesis of polymers with regular structures by kinds of supramolecular templates. We have synthesized high molecular weight, soluble perfect ladder polysiloxanes by kinds of supramolecular ladder assembly templates formed via the concerted effects of H-bonding itself; with charge transfer (CT) interaction between electron donors and acceptors and with Ï€-Ï€ stacking interaction. Here, we intend to expand the strategies used before from Si-based to C-based ladder polymers (LPs).The main research results are listed as fellows;1. A two-step synthesis strategy including the H-bonded self-assembly of monomers into a regular ladder superstructure (LS) and the construction of covalent ladder polymers was first proposed for synthesis of C-based LPs2. Novel three monomers enabling a supramolecular assembly and polymerization were first designed and synthesized. The rigid p-terphenyl in monomer structures is very important for supramolecular assembly and characterization of LS and LP. The ladder structures of LS and LP were observed easily.3. An ordered ladder polyester (LPE) with high molecular weight was first synthesized through the ladder superstructure (LS) constructed by concerted interactions of hydroxyl- and aramide-based H-bonding and p-terphenyl (TP)-based Ï€-Ï€ stacking by dehydrochlorination condensation using phosgene (COCl₂) as coupling agent. The target ladder polyester LPE was well characterized by FTIR, XRD DSC and AFM techniques. It should be emphasized that the AFM image gives a directly visual evidence of the ladder polymer, which has not been reported yet before...