The Synthesis And Properties Of Two Kinds Of Polymers Based On Pillar[5]arene

With the rapid development of the current period,material chemistry has become an indispensable part of the national scientific and technological development and progress.As an important part of material chemistry,polymer materials play a vital role in the development and application of material chemistry with their own advantages.In terms of performance,polymer materials which different from the singleness of small molecular materials,combine the characteristics of many monomers and show more superior performance on a macro level.Based on these studies,the development of polymer materials with diverse properties has become the focus of researchers.As a new subject,supramolecular chemistry provides new ideas and methods for the construction of various polymer materials.The most important part of supramolecular chemistry is the research and application of supramolecular macrocycles.As a new generation of supramolecular macrocycles,pillararenes have been widely developed and applied to various polymer materials since they were combined and reported by Ogoshi group in 2008,reflecting the great advantages of supramolecular macrocycles in the construction of polymer materials.Since its development,fluorescent molecules have been gradually introduced by researchers into supramolecular polymer systems of pillararene by taking advantage of their own luminescence properties,and have played an important role in fluorescence imaging,controlled drug release and ion detection.Based on the above investigations,we designed and synthesized two polymer materials based on pillar[5]arene.Based on the above research,in the research work of this paper,two kinds of polymer systems based on pillar[5]arenes were designed and synthesized.Firstly,we designed and synthesized a highly rigid conjugated polymer system.From the perspective of polymerization method,the system effectively combined pillararenes with fluorescent molecules,successfully constructed linear fluorescent conjugated polymers,effectively regulated their morphology,and continually enriched polymer systems with conjugated structures.In addition,we all know that the biggest feature of conjugated polymers is that they have great rigidity,which will limit the development of polymer properties.Based on the above investigations,two polymer materials based on pillar[5]arenes were designed and synthesized in this research work.Firstly,in the first research topic,we designed and synthesized a new type of fluorescent conjugated polymer system with strong rigidity.The system used the polymerization method of the Sonogashira coupling to effectively combine the pillararene and the fluorescent molecule,and successfully constructed a linear fluorescent conjugated polymer.In addition to the characterization of its excellent fluorescence properties,this polymer can effectively control the morphology,enriching the polymer system with conjugated structures.However,the increase in rigidity also has two sides.Excessive rigidity will bring certain limitations to the formation of supramolecular polymers.Therefore,we designed and synthesized another stimuli-responsive supramolecular polymer,which effectively avoids the steric hindrance effect caused by excessive rigidity and is applied to the adsorption and separation of aqueous dye molecules.1.We designed and prepared a rigid linear fluorescent conjugated polymer p(P[5](OTf)2-co-9,10-dea)and investigated its properties.First,a linear fluorescent conjugated polymer was successfully synthesized by the coupling reaction of a pillar[5]arene derivative modified with a trifluoromethanesulfonic anhydride group and an alkynyl-modified anthracene molecule.Subsequently,we optimized the conditions of its synthesis reaction,such as reaction solvent,temperature,time and catalyst ratio,which obtained a better reaction yield for synthesizing the polymer.In order to study the optical properties of this novel conjugated polymer,we conducted experiments on UV-vis absorption spectrum,fluorescence spectrum,fluorescence lifetime and fluorescence quantum yield.Conjugated polymers have better fluorescence properties.Finally,we also realized the regulation of the polymer morphology from linear to film-like by changing the polymer concentration,which provided a new idea and theoretical basis for the subsequent research on film-like materials.2.We designed and synthesized another supramolecular polymer based on pillar[5]arene.First,the functionalized pillar[5]arene and bis(4-hydroxyphenyl)disulfide were used to synthesize the polymer host molecule(P5)2 through substitution reaction,and then it was combined with the alkyl chain-modified bis-bipyridyl guest G,which has successfully constructed a stimuli-responsive supramolecular polymer driven by host-guest interaction.Based on the flexible structure of the polymer itself,we successfully constructed a supramolecular polymer gel system by adjusting its solvent,temperature and concentration.Considering the existence of disulfide bonds in the polymer host(P5)2 and the different bonding strengths of(P5)2 to different guest molecules,we carried out stimuli-responsive characterization experiments on the supramolecular polymer gels by using the stimuli-responsiveness of the gels to the reducing agent(dithiothreitol DTT)and the competing guest(adiponitrile).The data indicate that the supramolecular polymer gel has certain stimulus-responsive properties.It is worth noting that the supramolecular polymer gel can effectively adsorb the dyes eosin and rhodamine 6G,and has a certain potential in the adsorption of dyes,which provides a research basis for the research of polymer materials in water pollution control.