Helix-sense-selective Polymerization Of Schiff-base Substituted Phenylacetylenes And Its Performance

Helical polymers such as DNAs and protein are a wide range of macromolecules that are widely existed in life and nature.Meanwhile,it attracts much attention of scientists and researchers due to its unique performance and potential application in the research field of molecular recongnition,asymmetric catalyst,chiral stationary phase,liquid crystal materials and so on.Poly(phenylacetylene)s are widely used in industrial and academic of polymer materials because of its alternately double-bond conjugated backbone structure and unique optical properties.Traditional poly(phenylacetylene)s commonly exhibit poor solubility in common organic solvents.Moreover,chiral substituted poly(phenylacetylene)s can`t maintain its chiral conformation in solution after removing chiral side groups.Herein,we designed and synthesized helical poly(phenylacetylene)s containing two hydroxy groups without any chiral side groups exhibiting good solubility.In addition,the helical conformation was stable in the solution.On the basis of its unique performance,we investigated the application of poly(phenylacetylene)s in the field of gas separation and asymmetric catalytic reaction.The specific research content is as following:Phenylacetylene(APDHPICn)containing two hydroxy groups with different length alkyl groups were polymerized through helix-sense-selective polymerization.The polymerization reaction conditions were screened.Meanwhile,the effect of side chain alkyl length on the main chain helical conformation was explored.The chiral monomer(APSP)used as a chiral source,asymmetric copolymerization of APDHPICn and APSP were studied,and the main chain helical conformation of polymer of different proportional monomers was explored.Exploration of the solubility of the polymer obtained from the above helix-sense-selective polymerization and the asymmetric induction polymerization,helical substituted poly(phenylacetylene)films were preparedby solvent-casting method under the optimum condidtion.Gas separation of poly(phenylacetylene)films was studied and the relationship between the polymer main chain helical conformation and the selection of oxygen nitrogen mixed gas was explored.A series of schiff-based phenylacetylenes monomers and polymers were synthesized to catalyze the Henry reaction,and the target products were obtained in medium yield through homogeneous and heterogeneous catalytic reactions.However,the products show no optical activity and optimization of related reactions is still in progress.